The asymmetric unit of the title compound, C
12H
10BNO
5·0.67H
2O, contains three independent pyridinylboronic acid esters adopting zwitterionic forms and two water molecules. The six-membered heterocyclic rings in the boronic esters have half-chair conformations and the deviations of the B atoms from the boronate mean planes range from 0.456 (3) to 0.657 (3) Å. All of the B atoms have tetrahedral coordination environments, with B—O and B—C bond lengths of 1.446 (4)–1.539 (3) and 1.590 (5)–1.609 (5) Å, respectively. In the crystal, the ester and water molecules are linked into a three-dimensional network by a large number of O—H

O, N—H

O and C—H

O hydrogen bonds. The crystal packing is further accomplished by π–π interactions, with centroid–centroid distances of 3.621 (4)–3.787 (4) Å.
Supporting information
CCDC reference: 988588
Key indicators
- Single-crystal X-ray study
- T = 100 K
- Mean
(C-C) = 0.005 Å
- R factor = 0.053
- wR factor = 0.092
- Data-to-parameter ratio = 12.3
checkCIF/PLATON results
No syntax errors found
Alert level B
PLAT417_ALERT_2_B Short Inter D-H..H-D H44' .. H61B .. 2.06 Ang.
Alert level C
DIFMX01_ALERT_2_C The maximum difference density is > 0.1*ZMAX*0.75
_refine_diff_density_max given = 0.710
Test value = 0.600
DIFMX02_ALERT_1_C The maximum difference density is > 0.1*ZMAX*0.75
The relevant atom site should be identified.
PLAT094_ALERT_2_C Ratio of Maximum / Minimum Residual Density .... 2.73 Why ?
PLAT097_ALERT_2_C Large Reported Max. (Positive) Residual Density 0.71 eA-3
PLAT230_ALERT_2_C Hirshfeld Test Diff for O3 -- C7 .. 6.5 su
PLAT230_ALERT_2_C Hirshfeld Test Diff for O23 -- C27 .. 5.5 su
PLAT230_ALERT_2_C Hirshfeld Test Diff for C42 -- C47 .. 6.7 su
PLAT340_ALERT_3_C Low Bond Precision on C-C Bonds ............... 0.0046 Ang.
PLAT906_ALERT_3_C Large K value in the Analysis of Variance ...... 3.043 Check
PLAT911_ALERT_3_C Missing # FCF Refl Between THmin & STh/L= 0.600 19 Why ?
PLAT934_ALERT_3_C Number of (Iobs-Icalc)/SigmaW > 10 Outliers .... 1 Check
Alert level G
FORMU01_ALERT_1_G There is a discrepancy between the atom counts in the
_chemical_formula_sum and _chemical_formula_moiety. This is
usually due to the moiety formula being in the wrong format.
Atom count from _chemical_formula_sum: C12 H11.33 B1 N1 O5.67
Atom count from _chemical_formula_moiety:C12 H11.34 B1 N1 O5.67
PLAT002_ALERT_2_G Number of Distance or Angle Restraints on AtSite 24 Note
PLAT005_ALERT_5_G No _iucr_refine_instructions_details in the CIF Please Do !
PLAT042_ALERT_1_G Calc. and Reported MoietyFormula Strings Differ Please Check
PLAT045_ALERT_1_G Calculated and Reported Z Differ by ............ 0.33 Ratio
PLAT066_ALERT_1_G Predicted and Reported Tmin&Tmax Range Identical ? Check
PLAT790_ALERT_4_G Centre of Gravity not Within Unit Cell: Resd. # 2 Note
C12 H10 B N O5
PLAT860_ALERT_3_G Number of Least-Squares Restraints ............. 13 Note
PLAT910_ALERT_3_G Missing # of FCF Reflections Below Th(Min) ..... 2 Why ?
PLAT912_ALERT_4_G Missing # of FCF Reflections Above STh/L= 0.600 6 Note
0 ALERT level A = Most likely a serious problem - resolve or explain
1 ALERT level B = A potentially serious problem, consider carefully
11 ALERT level C = Check. Ensure it is not caused by an omission or oversight
10 ALERT level G = General information/check it is not something unexpected
5 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
8 ALERT type 2 Indicator that the structure model may be wrong or deficient
6 ALERT type 3 Indicator that the structure quality may be low
2 ALERT type 4 Improvement, methodology, query or suggestion
1 ALERT type 5 Informative message, check
C12H10BNO5 was formed from a solution of 3-pyridin boronic acid (0.05 g,
0.41 mmol), 2,5-dihydroxybenzoic acid (0.06 g, 0.41 mmol) in a solvent mixture
of CH3OH (8 ml) and H2O (2 ml), which was heated under reflux for 1 h,
giving a clear transparent solution. Cooling the reaction mixture slowly to
room temperature afforded yellow crystals suitable for X-ray diffraction in
approximately 55% yield. 11B NMR (64 MHz, DMSO-d6) δ: 3.8 p.p.m..
H atoms bonded to C atoms were positioned geometrically and constrained using
the riding-model approximation [C—H = 0.95 A and Uiso(H) =
1.2Ueq(C)]. H atoms bonded to O and N were initially located in a
difference Fourier map; then, the positions were refined with O(N)—H
distance restraints of 0.840 (1) A and with Uiso(H) =
1.5Ueq(O,N).
Data collection: SMART (Bruker, 2000); cell refinement: SAINT-Plus-NT (Bruker, 2001); data reduction: SAINT-Plus-NT (Bruker, 2001); program(s) used to solve structure: SHELXTL-NT (Sheldrick, 2008); program(s) used to refine structure: SHELXTL-NT (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and Mercury (Macrae et al., 2008); software used to prepare material for publication: publCIF (Westrip, 2010).
2,6-Dihydroxy-4-oxo-2-(pyridin-1-ium-3-yl)-4
H-1,3,2-benzodioxaborinin-2-ide 0.67-hydrate
top
Crystal data top
C12H10BNO5·0.67H2O | Z = 6 |
Mr = 271.03 | F(000) = 844 |
Triclinic, P1 | Dx = 1.500 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 10.350 (2) Å | Cell parameters from 1641 reflections |
b = 13.916 (3) Å | θ = 2.5–21.2° |
c = 14.340 (3) Å | µ = 0.12 mm−1 |
α = 65.785 (4)° | T = 100 K |
β = 73.421 (4)° | Block, light yellow |
γ = 87.213 (5)° | 0.45 × 0.41 × 0.28 mm |
V = 1799.8 (7) Å3 | |
Data collection top
Bruker APEX CCD area-detector diffractometer | 7051 independent reflections |
Radiation source: fine-focus sealed tube | 3529 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.092 |
Detector resolution: 8.3 pixels mm-1 | θmax = 26.0°, θmin = 1.8° |
phi and ω scans | h = −12→12 |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | k = −17→17 |
Tmin = 0.95, Tmax = 0.97 | l = −17→17 |
18938 measured reflections | |
Refinement top
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.053 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.092 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | w = 1/[σ2(Fo2) + (0.0125P)2] where P = (Fo2 + 2Fc2)/3 |
7051 reflections | (Δ/σ)max < 0.001 |
571 parameters | Δρmax = 0.71 e Å−3 |
13 restraints | Δρmin = −0.26 e Å−3 |
Crystal data top
C12H10BNO5·0.67H2O | γ = 87.213 (5)° |
Mr = 271.03 | V = 1799.8 (7) Å3 |
Triclinic, P1 | Z = 6 |
a = 10.350 (2) Å | Mo Kα radiation |
b = 13.916 (3) Å | µ = 0.12 mm−1 |
c = 14.340 (3) Å | T = 100 K |
α = 65.785 (4)° | 0.45 × 0.41 × 0.28 mm |
β = 73.421 (4)° | |
Data collection top
Bruker APEX CCD area-detector diffractometer | 7051 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 3529 reflections with I > 2σ(I) |
Tmin = 0.95, Tmax = 0.97 | Rint = 0.092 |
18938 measured reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.053 | 13 restraints |
wR(F2) = 0.092 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | Δρmax = 0.71 e Å−3 |
7051 reflections | Δρmin = −0.26 e Å−3 |
571 parameters | |
Special details top
Experimental. IR (KBr): 3520, 3370, 2950, 3024, 2942, 1648, 1615,
1562, 1480, 1305 and 786 cm-1. |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes)
are estimated using the full covariance matrix. The cell e.s.d.'s are taken
into account individually in the estimation of e.s.d.'s in distances, angles
and torsion angles; correlations between e.s.d.'s in cell parameters are only
used when they are defined by crystal symmetry. An approximate (isotropic)
treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s.
planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor
wR and goodness of fit S are based on F2, conventional
R-factors R are based on F, with F set to zero for
negative F2. The threshold expression of F2 >
σ(F2) is used only for calculating R-factors(gt) etc.
and is not relevant to the choice of reflections for refinement.
R-factors based on F2 are statistically about twice as large
as those based on F, and R- factors based on ALL data will be
even larger. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
B1 | 0.9002 (3) | 0.3451 (3) | 0.2383 (3) | 0.0221 (9) | |
N1 | 0.8273 (3) | 0.4137 (2) | 0.4822 (2) | 0.0249 (7) | |
H1' | 0.837 (3) | 0.4691 (13) | 0.490 (2) | 0.037* | |
O1 | 0.83252 (17) | 0.25852 (15) | 0.23193 (14) | 0.0223 (5) | |
O2 | 0.86471 (17) | 0.45237 (15) | 0.16481 (14) | 0.0196 (5) | |
O3 | 0.82959 (17) | 0.55863 (15) | 0.01161 (15) | 0.0204 (5) | |
O4 | 0.76584 (19) | 0.30256 (15) | −0.15147 (16) | 0.0230 (5) | |
H4' | 0.752 (3) | 0.3656 (7) | −0.185 (2) | 0.034* | |
O5 | 1.04678 (19) | 0.34308 (16) | 0.20681 (14) | 0.0237 (5) | |
H5' | 1.083 (2) | 0.374 (2) | 0.1405 (4) | 0.036* | |
C1 | 0.8181 (3) | 0.2723 (3) | 0.1362 (2) | 0.0210 (8) | |
C2 | 0.8197 (2) | 0.3732 (2) | 0.0568 (2) | 0.0162 (7) | |
C3 | 0.8017 (2) | 0.3854 (2) | −0.0408 (2) | 0.0195 (7) | |
H3 | 0.8042 | 0.4540 | −0.0954 | 0.023* | |
C4 | 0.7803 (3) | 0.2968 (2) | −0.0568 (2) | 0.0189 (8) | |
C5 | 0.7774 (2) | 0.1964 (2) | 0.0234 (2) | 0.0195 (7) | |
H5 | 0.7624 | 0.1359 | 0.0118 | 0.023* | |
C6 | 0.7958 (3) | 0.1834 (2) | 0.1190 (2) | 0.0203 (8) | |
H6 | 0.7935 | 0.1145 | 0.1730 | 0.024* | |
C7 | 0.8381 (3) | 0.4674 (3) | 0.0756 (2) | 0.0207 (8) | |
C8 | 0.8476 (3) | 0.3359 (2) | 0.3585 (2) | 0.0204 (8) | |
C9 | 0.8663 (3) | 0.4209 (2) | 0.3818 (2) | 0.0258 (8) | |
H9 | 0.9080 | 0.4860 | 0.3250 | 0.031* | |
C10 | 0.7715 (3) | 0.3239 (3) | 0.5661 (2) | 0.0249 (8) | |
H10 | 0.7465 | 0.3211 | 0.6363 | 0.030* | |
C11 | 0.7504 (3) | 0.2356 (3) | 0.5504 (2) | 0.0252 (8) | |
H11 | 0.7115 | 0.1709 | 0.6093 | 0.030* | |
C12 | 0.7875 (3) | 0.2433 (2) | 0.4464 (2) | 0.0223 (8) | |
H12 | 0.7711 | 0.1830 | 0.4349 | 0.027* | |
B21 | −0.0548 (3) | 0.8085 (3) | 0.2594 (3) | 0.0228 (9) | |
N21 | −0.1361 (2) | 0.7302 (2) | 0.0507 (2) | 0.0203 (6) | |
H21' | −0.147 (3) | 0.6730 (11) | 0.046 (2) | 0.030* | |
O21 | −0.12591 (17) | 0.88671 (15) | 0.29523 (15) | 0.0223 (5) | |
O22 | −0.09568 (17) | 0.69622 (15) | 0.34851 (15) | 0.0217 (5) | |
O23 | −0.14161 (18) | 0.58725 (16) | 0.51874 (15) | 0.0241 (5) | |
O24 | −0.14430 (19) | 0.83893 (16) | 0.70031 (16) | 0.0263 (5) | |
H24' | −0.113 (3) | 0.7810 (11) | 0.729 (2) | 0.039* | |
O25 | 0.08854 (18) | 0.83243 (16) | 0.23529 (16) | 0.0241 (5) | |
H25' | 0.139 (2) | 0.7942 (19) | 0.210 (2) | 0.036* | |
C21 | −0.1338 (3) | 0.8719 (3) | 0.3963 (2) | 0.0206 (8) | |
C22 | −0.1302 (3) | 0.7722 (2) | 0.4743 (2) | 0.0178 (7) | |
C23 | −0.1363 (3) | 0.7592 (2) | 0.5777 (2) | 0.0212 (8) | |
H23 | −0.1352 | 0.6907 | 0.6312 | 0.025* | |
C24 | −0.1440 (3) | 0.8462 (2) | 0.6014 (2) | 0.0213 (8) | |
C25 | −0.1537 (3) | 0.9453 (2) | 0.5241 (2) | 0.0255 (8) | |
H25 | −0.1638 | 1.0045 | 0.5419 | 0.031* | |
C26 | −0.1489 (3) | 0.9593 (2) | 0.4221 (2) | 0.0245 (8) | |
H26 | −0.1559 | 1.0273 | 0.3701 | 0.029* | |
C27 | −0.1224 (3) | 0.6792 (3) | 0.4487 (2) | 0.0199 (8) | |
C28 | −0.0973 (3) | 0.8118 (2) | 0.1587 (2) | 0.0182 (7) | |
C29 | −0.1085 (3) | 0.7234 (2) | 0.1394 (2) | 0.0213 (8) | |
H29 | −0.0965 | 0.6561 | 0.1900 | 0.026* | |
C30 | −0.1534 (3) | 0.8226 (2) | −0.0245 (2) | 0.0212 (8) | |
H30 | −0.1701 | 0.8247 | −0.0871 | 0.025* | |
C31 | −0.1470 (3) | 0.9131 (2) | −0.0107 (2) | 0.0251 (8) | |
H31 | −0.1602 | 0.9790 | −0.0629 | 0.030* | |
C32 | −0.1203 (2) | 0.9070 (2) | 0.0823 (2) | 0.0216 (8) | |
H32 | −0.1180 | 0.9696 | 0.0934 | 0.026* | |
B41 | 0.5523 (3) | 0.5007 (3) | 0.7575 (3) | 0.0271 (10) | |
N41 | 0.5362 (3) | 0.7370 (3) | 0.8323 (2) | 0.0331 (7) | |
H41' | 0.549 (3) | 0.746 (3) | 0.8832 (17) | 0.050* | |
O41 | 0.47752 (18) | 0.48464 (17) | 0.69074 (15) | 0.0278 (6) | |
O42 | 0.49835 (18) | 0.42130 (17) | 0.87233 (15) | 0.0253 (5) | |
O43 | 0.44602 (18) | 0.25267 (16) | 0.98428 (16) | 0.0293 (6) | |
O44 | 0.4175 (2) | 0.07153 (18) | 0.74251 (18) | 0.0370 (6) | |
H44' | 0.452 (3) | 0.035 (2) | 0.7914 (17) | 0.056* | |
O45 | 0.69516 (18) | 0.47905 (17) | 0.72686 (15) | 0.0255 (5) | |
H45' | 0.743 (2) | 0.514 (2) | 0.6640 (8) | 0.038* | |
C41 | 0.4587 (3) | 0.3823 (3) | 0.7069 (2) | 0.0257 (8) | |
C42 | 0.4645 (3) | 0.2998 (3) | 0.8004 (2) | 0.0222 (8) | |
C43 | 0.4520 (3) | 0.1950 (3) | 0.8145 (2) | 0.0275 (8) | |
H43 | 0.4589 | 0.1389 | 0.8786 | 0.033* | |
C44 | 0.4293 (3) | 0.1734 (3) | 0.7338 (2) | 0.0257 (8) | |
C45 | 0.4154 (3) | 0.2559 (3) | 0.6422 (2) | 0.0277 (8) | |
H45 | 0.3957 | 0.2411 | 0.5884 | 0.033* | |
C46 | 0.4301 (3) | 0.3593 (3) | 0.6284 (2) | 0.0277 (8) | |
H46 | 0.4207 | 0.4153 | 0.5652 | 0.033* | |
C47 | 0.4713 (3) | 0.3225 (3) | 0.8912 (3) | 0.0275 (8) | |
C48 | 0.5329 (3) | 0.6165 (3) | 0.7528 (2) | 0.0245 (8) | |
C49 | 0.5463 (3) | 0.6392 (3) | 0.8358 (3) | 0.0300 (9) | |
H49 | 0.5629 | 0.5839 | 0.8965 | 0.036* | |
C50 | 0.5167 (3) | 0.8196 (3) | 0.7474 (3) | 0.0361 (9) | |
H50 | 0.5147 | 0.8887 | 0.7456 | 0.043* | |
C51 | 0.4998 (3) | 0.8035 (3) | 0.6645 (3) | 0.0350 (9) | |
H51 | 0.4834 | 0.8607 | 0.6050 | 0.042* | |
C52 | 0.5070 (3) | 0.7020 (3) | 0.6678 (2) | 0.0309 (9) | |
H52 | 0.4938 | 0.6907 | 0.6100 | 0.037* | |
O61 | 0.4664 (2) | 0.0441 (2) | 0.10850 (19) | 0.0460 (7) | |
H61A | 0.468 (3) | 0.1027 (14) | 0.0576 (19) | 0.069* | |
H61B | 0.3878 (13) | 0.028 (3) | 0.151 (2) | 0.069* | |
O62 | 0.2191 (2) | 0.98825 (19) | 0.24779 (19) | 0.0329 (6) | |
H62A | 0.175 (3) | 0.9429 (18) | 0.242 (3) | 0.049* | |
H62B | 0.175 (3) | 1.0343 (18) | 0.264 (2) | 0.049* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
B1 | 0.024 (2) | 0.019 (2) | 0.021 (2) | −0.0021 (17) | −0.0106 (18) | −0.0041 (19) |
N1 | 0.0314 (16) | 0.026 (2) | 0.0243 (17) | 0.0072 (15) | −0.0157 (13) | −0.0130 (16) |
O1 | 0.0317 (12) | 0.0254 (14) | 0.0138 (13) | 0.0026 (10) | −0.0129 (10) | −0.0079 (10) |
O2 | 0.0264 (12) | 0.0219 (13) | 0.0147 (12) | 0.0037 (9) | −0.0125 (10) | −0.0075 (10) |
O3 | 0.0280 (12) | 0.0197 (13) | 0.0141 (12) | 0.0034 (10) | −0.0092 (10) | −0.0058 (11) |
O4 | 0.0318 (12) | 0.0257 (14) | 0.0190 (14) | 0.0090 (11) | −0.0165 (10) | −0.0112 (11) |
O5 | 0.0267 (13) | 0.0311 (15) | 0.0120 (12) | 0.0024 (10) | −0.0094 (10) | −0.0053 (11) |
C1 | 0.0194 (17) | 0.028 (2) | 0.0165 (19) | −0.0002 (15) | −0.0074 (14) | −0.0081 (17) |
C2 | 0.0154 (16) | 0.020 (2) | 0.0141 (18) | 0.0028 (14) | −0.0050 (14) | −0.0079 (16) |
C3 | 0.0164 (16) | 0.022 (2) | 0.0201 (19) | 0.0022 (14) | −0.0088 (14) | −0.0060 (16) |
C4 | 0.0155 (17) | 0.025 (2) | 0.0198 (19) | 0.0054 (15) | −0.0106 (14) | −0.0099 (17) |
C5 | 0.0207 (17) | 0.018 (2) | 0.022 (2) | 0.0044 (14) | −0.0067 (15) | −0.0103 (16) |
C6 | 0.0231 (17) | 0.021 (2) | 0.0157 (19) | 0.0023 (15) | −0.0076 (14) | −0.0057 (16) |
C7 | 0.0136 (17) | 0.032 (2) | 0.019 (2) | 0.0037 (15) | −0.0046 (14) | −0.0138 (18) |
C8 | 0.0208 (17) | 0.024 (2) | 0.022 (2) | 0.0052 (15) | −0.0130 (15) | −0.0097 (17) |
C9 | 0.0336 (19) | 0.033 (2) | 0.0109 (19) | 0.0014 (16) | −0.0128 (16) | −0.0048 (17) |
C10 | 0.0254 (18) | 0.033 (2) | 0.0141 (19) | 0.0068 (17) | −0.0088 (15) | −0.0067 (18) |
C11 | 0.0285 (18) | 0.028 (2) | 0.0155 (19) | −0.0004 (16) | −0.0064 (15) | −0.0049 (16) |
C12 | 0.0253 (18) | 0.024 (2) | 0.025 (2) | 0.0060 (15) | −0.0132 (15) | −0.0132 (17) |
B21 | 0.024 (2) | 0.022 (2) | 0.024 (2) | 0.0031 (18) | −0.0151 (18) | −0.0059 (19) |
N21 | 0.0208 (14) | 0.0213 (18) | 0.0225 (16) | 0.0019 (13) | −0.0085 (12) | −0.0112 (15) |
O21 | 0.0301 (12) | 0.0268 (14) | 0.0156 (13) | 0.0106 (10) | −0.0124 (10) | −0.0112 (11) |
O22 | 0.0255 (12) | 0.0278 (14) | 0.0134 (13) | 0.0019 (10) | −0.0085 (10) | −0.0083 (11) |
O23 | 0.0333 (12) | 0.0204 (14) | 0.0172 (13) | −0.0001 (10) | −0.0096 (10) | −0.0049 (11) |
O24 | 0.0406 (14) | 0.0272 (15) | 0.0187 (14) | 0.0121 (11) | −0.0180 (11) | −0.0116 (12) |
O25 | 0.0243 (13) | 0.0319 (15) | 0.0227 (13) | 0.0050 (10) | −0.0088 (10) | −0.0165 (11) |
C21 | 0.0207 (17) | 0.031 (2) | 0.018 (2) | 0.0040 (15) | −0.0108 (15) | −0.0150 (17) |
C22 | 0.0166 (16) | 0.023 (2) | 0.0174 (19) | 0.0023 (14) | −0.0094 (14) | −0.0089 (16) |
C23 | 0.0197 (17) | 0.025 (2) | 0.019 (2) | 0.0029 (15) | −0.0101 (14) | −0.0063 (16) |
C24 | 0.0224 (17) | 0.026 (2) | 0.020 (2) | 0.0059 (15) | −0.0123 (15) | −0.0098 (17) |
C25 | 0.0332 (19) | 0.027 (2) | 0.026 (2) | 0.0100 (16) | −0.0141 (16) | −0.0182 (18) |
C26 | 0.0324 (19) | 0.023 (2) | 0.019 (2) | 0.0080 (16) | −0.0134 (16) | −0.0072 (16) |
C27 | 0.0133 (16) | 0.032 (2) | 0.018 (2) | 0.0027 (15) | −0.0095 (15) | −0.0108 (18) |
C28 | 0.0168 (16) | 0.019 (2) | 0.0169 (19) | 0.0011 (14) | −0.0049 (14) | −0.0056 (16) |
C29 | 0.0225 (17) | 0.027 (2) | 0.0153 (19) | 0.0048 (15) | −0.0104 (14) | −0.0064 (16) |
C30 | 0.0248 (18) | 0.024 (2) | 0.0145 (19) | 0.0017 (15) | −0.0107 (15) | −0.0047 (16) |
C31 | 0.0281 (19) | 0.022 (2) | 0.025 (2) | 0.0031 (15) | −0.0127 (16) | −0.0069 (17) |
C32 | 0.0214 (17) | 0.022 (2) | 0.024 (2) | 0.0050 (14) | −0.0103 (15) | −0.0094 (16) |
B41 | 0.026 (2) | 0.035 (3) | 0.017 (2) | 0.0007 (19) | −0.0083 (18) | −0.006 (2) |
N41 | 0.0249 (16) | 0.041 (2) | 0.036 (2) | 0.0050 (14) | −0.0090 (15) | −0.0192 (18) |
O41 | 0.0315 (13) | 0.0310 (15) | 0.0220 (13) | 0.0021 (11) | −0.0159 (10) | −0.0066 (12) |
O42 | 0.0271 (12) | 0.0286 (15) | 0.0176 (13) | 0.0018 (11) | −0.0084 (10) | −0.0058 (11) |
O43 | 0.0302 (12) | 0.0322 (15) | 0.0197 (13) | −0.0023 (11) | −0.0093 (10) | −0.0033 (12) |
O44 | 0.0433 (15) | 0.0343 (17) | 0.0420 (17) | 0.0069 (12) | −0.0229 (12) | −0.0176 (14) |
O45 | 0.0239 (12) | 0.0344 (15) | 0.0157 (13) | 0.0035 (10) | −0.0053 (10) | −0.0084 (12) |
C41 | 0.0215 (18) | 0.030 (2) | 0.023 (2) | −0.0005 (16) | −0.0094 (15) | −0.0066 (18) |
C42 | 0.0211 (18) | 0.031 (2) | 0.017 (2) | 0.0017 (15) | −0.0104 (15) | −0.0086 (17) |
C43 | 0.0253 (18) | 0.030 (2) | 0.023 (2) | −0.0005 (16) | −0.0106 (16) | −0.0043 (17) |
C44 | 0.0223 (18) | 0.030 (2) | 0.023 (2) | 0.0009 (16) | −0.0073 (15) | −0.0087 (18) |
C45 | 0.0225 (18) | 0.038 (2) | 0.023 (2) | −0.0017 (17) | −0.0076 (15) | −0.0110 (18) |
C46 | 0.0229 (18) | 0.037 (2) | 0.021 (2) | 0.0050 (16) | −0.0109 (15) | −0.0067 (18) |
C47 | 0.0161 (18) | 0.031 (2) | 0.029 (2) | −0.0005 (16) | −0.0077 (16) | −0.0057 (19) |
C48 | 0.0181 (17) | 0.035 (2) | 0.020 (2) | 0.0043 (15) | −0.0048 (15) | −0.0120 (18) |
C49 | 0.0242 (19) | 0.035 (2) | 0.033 (2) | 0.0082 (17) | −0.0136 (16) | −0.0127 (19) |
C50 | 0.033 (2) | 0.031 (2) | 0.045 (3) | 0.0061 (17) | −0.0132 (19) | −0.015 (2) |
C51 | 0.037 (2) | 0.035 (3) | 0.033 (2) | 0.0121 (18) | −0.0164 (18) | −0.0112 (19) |
C52 | 0.0264 (19) | 0.038 (2) | 0.027 (2) | 0.0083 (17) | −0.0078 (16) | −0.0135 (19) |
O61 | 0.0400 (14) | 0.0447 (19) | 0.0402 (19) | 0.0037 (15) | −0.0133 (13) | −0.0038 (14) |
O62 | 0.0376 (15) | 0.0347 (18) | 0.0381 (15) | 0.0054 (12) | −0.0178 (12) | −0.0220 (13) |
Geometric parameters (Å, º) top
B1—O1 | 1.469 (5) | C23—C24 | 1.379 (5) |
B1—O2 | 1.533 (3) | C24—C25 | 1.391 (3) |
B1—O5 | 1.456 (3) | C25—H25 | 0.950 |
B1—C8 | 1.604 (5) | C25—C26 | 1.381 (5) |
N1—H1' | 0.84 (3) | C26—H26 | 0.950 |
N1—C9 | 1.340 (4) | C28—C29 | 1.384 (5) |
N1—C10 | 1.334 (3) | C28—C32 | 1.392 (3) |
O1—C1 | 1.357 (4) | C29—H29 | 0.950 |
O2—C7 | 1.316 (4) | C30—H30 | 0.950 |
O3—C7 | 1.241 (3) | C30—C31 | 1.360 (5) |
O4—H4' | 0.840 (12) | C31—H31 | 0.950 |
O4—C4 | 1.377 (4) | C31—C32 | 1.406 (5) |
O5—H5' | 0.839 (6) | C32—H32 | 0.950 |
C1—C2 | 1.395 (3) | B41—O41 | 1.476 (5) |
C1—C6 | 1.398 (5) | B41—O42 | 1.512 (3) |
C2—C3 | 1.404 (4) | B41—O45 | 1.471 (3) |
C2—C7 | 1.474 (5) | B41—C48 | 1.590 (5) |
C3—H3 | 0.950 | N41—H41' | 0.84 (3) |
C3—C4 | 1.381 (5) | N41—C49 | 1.342 (5) |
C4—C5 | 1.392 (3) | N41—C50 | 1.347 (4) |
C5—H5 | 0.950 | O41—C41 | 1.359 (4) |
C5—C6 | 1.375 (4) | O42—C47 | 1.315 (4) |
C6—H6 | 0.950 | O43—C47 | 1.247 (3) |
C8—C9 | 1.390 (5) | O44—H44' | 0.84 (3) |
C8—C12 | 1.391 (3) | O44—C44 | 1.380 (4) |
C9—H9 | 0.950 | O45—H45' | 0.839 (11) |
C10—H10 | 0.950 | C41—C42 | 1.376 (4) |
C10—C11 | 1.374 (5) | C41—C46 | 1.397 (5) |
C11—H11 | 0.950 | C42—C43 | 1.395 (5) |
C11—C12 | 1.390 (4) | C42—C47 | 1.480 (6) |
C12—H12 | 0.950 | C43—H43 | 0.950 |
B21—O21 | 1.467 (4) | C43—C44 | 1.389 (5) |
B21—O22 | 1.539 (3) | C44—C45 | 1.384 (4) |
B21—O25 | 1.446 (4) | C45—H45 | 0.950 |
B21—C28 | 1.609 (5) | C45—C46 | 1.380 (5) |
N21—H21' | 0.84 (2) | C46—H46 | 0.950 |
N21—C29 | 1.346 (5) | C48—C49 | 1.393 (6) |
N21—C30 | 1.340 (3) | C48—C52 | 1.392 (4) |
O21—C21 | 1.355 (4) | C49—H49 | 0.950 |
O22—C27 | 1.302 (4) | C50—H50 | 0.950 |
O23—C27 | 1.242 (3) | C50—C51 | 1.353 (6) |
O24—H24' | 0.840 (18) | C51—H51 | 0.950 |
O24—C24 | 1.378 (4) | C51—C52 | 1.394 (5) |
O25—H25' | 0.84 (3) | C52—H52 | 0.950 |
C21—C22 | 1.386 (3) | O61—H61A | 0.840 (18) |
C21—C26 | 1.399 (5) | O61—H61B | 0.840 (14) |
C22—C23 | 1.400 (4) | O62—H62A | 0.84 (3) |
C22—C27 | 1.475 (5) | O62—H62B | 0.84 (3) |
C23—H23 | 0.950 | | |
| | | |
O1—B1—O2 | 110.5 (3) | C24—C25—C26 | 121.3 (3) |
O1—B1—O5 | 112 (3) | H25—C25—C26 | 119.0 |
O1—B1—C8 | 108.9 (3) | C21—C26—C25 | 119.1 (3) |
O2—B1—O5 | 107.9 (3) | C21—C26—H26 | 120.0 |
O2—B1—C8 | 107.8 (3) | C25—C26—H26 | 120.0 |
O5—B1—C8 | 109.8 (3) | O22—C27—O23 | 120.0 (4) |
H1'—N1—C9 | 117 (1) | O22—C27—C22 | 117.6 (3) |
H1'—N1—C10 | 120 (1) | O23—C27—C22 | 122.4 (3) |
C9—N1—C10 | 122.3 (3) | B21—C28—C29 | 123.4 (3) |
B1—O1—C1 | 118.5 (2) | B21—C28—C32 | 120.9 (3) |
B1—O2—C7 | 122.4 (2) | C29—C28—C32 | 115.7 (3) |
H4'—O4—C4 | 106 (2) | N21—C29—C28 | 121.7 (3) |
B1—O5—H5' | 113.5 (6) | N21—C29—H29 | 119.0 |
O1—C1—C2 | 121.3 (3) | C28—C29—H29 | 119.0 |
O1—C1—C6 | 119.0 (3) | N21—C30—H30 | 120.0 |
C2—C1—C6 | 119.7 (3) | N21—C30—C31 | 119.8 (3) |
C1—C2—C3 | 120.2 (3) | H30—C30—C31 | 120.0 |
C1—C2—C7 | 120.1 (3) | C30—C31—H31 | 121.0 |
C3—C2—C7 | 119.7 (3) | C30—C31—C32 | 118.5 (3) |
C2—C3—H3 | 120.0 | H31—C31—C32 | 121.0 |
C2—C3—C4 | 119.4 (3) | C28—C32—C31 | 121.9 (3) |
H3—C3—C4 | 120.0 | C28—C32—H32 | 119.0 |
O4—C4—C3 | 122.7 (3) | C31—C32—H32 | 119.0 |
O4—C4—C5 | 117.3 (3) | O41—B41—O42 | 110.4 (3) |
C3—C4—C5 | 120.0 (3) | O41—B41—O45 | 111.9 (3) |
C4—C5—H5 | 119.0 | O41—B41—C48 | 108.8 (3) |
C4—C5—C6 | 121.2 (3) | O42—B41—O45 | 103.7 (3) |
H5—C5—C6 | 119.0 | O42—B41—C48 | 108.9 (3) |
C1—C6—C5 | 119.6 (3) | O45—B41—C48 | 113.1 (3) |
C1—C6—H6 | 120.0 | H41'—N41—C49 | 117 (2) |
C5—C6—H6 | 120.0 | H41'—N41—C50 | 120 (2) |
O2—C7—O3 | 119.5 (3) | C49—N41—C50 | 122.2 (4) |
O2—C7—C2 | 117.5 (3) | B41—O41—C41 | 114.8 (3) |
O3—C7—C2 | 123.0 (3) | B41—O42—C47 | 118.5 (3) |
B1—C8—C9 | 121.0 (3) | H44'—O44—C44 | 104 (2) |
B1—C8—C12 | 123.6 (3) | B41—O45—H45' | 119 (1) |
C9—C8—C12 | 115.3 (3) | O41—C41—C42 | 121.5 (3) |
N1—C9—C8 | 121.9 (3) | O41—C41—C46 | 119.8 (3) |
N1—C9—H9 | 119.0 | C42—C41—C46 | 118.6 (3) |
C8—C9—H9 | 119.0 | C41—C42—C43 | 121.3 (3) |
N1—C10—H10 | 120.0 | C41—C42—C47 | 119.2 (3) |
N1—C10—C11 | 119.7 (3) | C43—C42—C47 | 119.2 (3) |
H10—C10—C11 | 120.0 | C42—C43—H43 | 120.0 |
C10—C11—H11 | 120.0 | C42—C43—C44 | 119.3 (3) |
C10—C11—C12 | 118.4 (3) | H43—C43—C44 | 120.0 |
H11—C11—C12 | 120.0 | O44—C44—C43 | 122 (3) |
C8—C12—C11 | 122.4 (3) | O44—C44—C45 | 118.3 (3) |
C8—C12—H12 | 119.0 | C43—C44—C45 | 119.7 (3) |
C11—C12—H12 | 119.0 | C44—C45—H45 | 120.0 |
O21—B21—O22 | 110.4 (3) | C44—C45—C46 | 120.5 (3) |
O21—B21—O25 | 107.4 (3) | H45—C45—C46 | 120.0 |
O21—B21—C28 | 109.5 (3) | C41—C46—C45 | 120.5 (3) |
O22—B21—O25 | 109.1 (3) | C41—C46—H46 | 120.0 |
O22—B21—C28 | 107.3 (2) | C45—C46—H46 | 120.0 |
O25—B21—C28 | 113.1 (3) | O42—C47—O43 | 119.8 (3) |
H21'—N21—C29 | 116 (1) | O42—C47—C42 | 117.8 (3) |
H21'—N21—C30 | 121 (1) | O43—C47—C42 | 122.4 (3) |
C29—N21—C30 | 122.4 (3) | B41—C48—C49 | 120.2 (3) |
B21—O21—C21 | 115.9 (3) | B41—C48—C52 | 124.5 (3) |
B21—O22—C27 | 120.9 (2) | C49—C48—C52 | 115.2 (3) |
H24'—O24—C24 | 105 (2) | N41—C49—C48 | 121.8 (4) |
B21—O25—H25' | 114 (2) | N41—C49—H49 | 119.0 |
O21—C21—C22 | 121.4 (3) | C48—C49—H49 | 119.0 |
O21—C21—C26 | 118.8 (3) | N41—C50—H50 | 120.0 |
C22—C21—C26 | 119.8 (3) | N41—C50—C51 | 119.5 (3) |
C21—C22—C23 | 120.3 (3) | H50—C50—C51 | 120.0 |
C21—C22—C27 | 119.8 (3) | C50—C51—H51 | 120.0 |
C23—C22—C27 | 119.9 (3) | C50—C51—C52 | 119.1 (4) |
C22—C23—H23 | 120.0 | H51—C51—C52 | 120.0 |
C22—C23—C24 | 119.8 (3) | C48—C52—C51 | 122.2 (3) |
H23—C23—C24 | 120.0 | C48—C52—H52 | 119.0 |
O24—C24—C23 | 122.4 (3) | C51—C52—H52 | 119.0 |
O24—C24—C25 | 118.1 (3) | H61A—O61—H61B | 108 (3) |
C23—C24—C25 | 119.5 (3) | H62A—O62—H62B | 116 (3) |
C24—C25—H25 | 119.0 | | |
| | | |
O5—B1—O1—C1 | −84.3 (3) | B21—O22—C27—O23 | −172.6 (2) |
O2—B1—O1—C1 | 36.0 (3) | B21—O22—C27—C22 | 8.1 (3) |
C8—B1—O1—C1 | 154.2 (2) | C21—C22—C27—O23 | −167.6 (2) |
O5—B1—O2—C7 | 92.1 (3) | C23—C22—C27—O23 | 11.3 (4) |
O1—B1—O2—C7 | −30.6 (3) | C21—C22—C27—O22 | 11.6 (4) |
C8—B1—O2—C7 | −149.4 (2) | C23—C22—C27—O22 | −169.5 (2) |
B1—O1—C1—C2 | −23.2 (4) | O25—B21—C28—C29 | 94.2 (3) |
B1—O1—C1—C6 | 159.4 (2) | O21—B21—C28—C29 | −146.0 (3) |
O1—C1—C2—C3 | −178.6 (2) | O22—B21—C28—C29 | −26.2 (4) |
C6—C1—C2—C3 | −1.3 (4) | O25—B21—C28—C32 | −83.3 (3) |
O1—C1—C2—C7 | 0.4 (4) | O21—B21—C28—C32 | 36.4 (4) |
C6—C1—C2—C7 | 177.8 (2) | O22—B21—C28—C32 | 156.3 (2) |
C1—C2—C3—C4 | 1.0 (4) | C30—N21—C29—C28 | 0.5 (4) |
C7—C2—C3—C4 | −178.0 (2) | C32—C28—C29—N21 | 1.9 (4) |
C2—C3—C4—O4 | −178.0 (2) | B21—C28—C29—N21 | −175.8 (3) |
C2—C3—C4—C5 | −0.3 (4) | C29—N21—C30—C31 | −1.8 (4) |
O4—C4—C5—C6 | 177.7 (2) | N21—C30—C31—C32 | 0.8 (4) |
C3—C4—C5—C6 | −0.1 (4) | C29—C28—C32—C31 | −2.9 (4) |
C4—C5—C6—C1 | −0.1 (4) | B21—C28—C32—C31 | 174.8 (2) |
O1—C1—C6—C5 | 178.2 (2) | C30—C31—C32—C28 | 1.6 (4) |
C2—C1—C6—C5 | 0.8 (4) | O45—B41—O41—C41 | 69.1 (3) |
B1—O2—C7—O3 | −169.4 (2) | O42—B41—O41—C41 | −45.8 (3) |
B1—O2—C7—C2 | 10.5 (4) | C48—B41—O41—C41 | −165.2 (2) |
C1—C2—C7—O3 | −174.1 (2) | O45—B41—O42—C47 | −77.1 (3) |
C3—C2—C7—O3 | 4.9 (4) | O41—B41—O42—C47 | 42.8 (4) |
C1—C2—C7—O2 | 6.0 (4) | C48—B41—O42—C47 | 162.2 (2) |
C3—C2—C7—O2 | −175.0 (2) | B41—O41—C41—C42 | 21.8 (4) |
O5—B1—C8—C9 | 74.1 (3) | B41—O41—C41—C46 | −159.4 (3) |
O1—B1—C8—C9 | −163.0 (2) | O41—C41—C42—C43 | −176.7 (3) |
O2—B1—C8—C9 | −43.1 (3) | C46—C41—C42—C43 | 4.6 (4) |
O5—B1—C8—C12 | −102.5 (3) | O41—C41—C42—C47 | 9.1 (4) |
O1—B1—C8—C12 | 20.4 (4) | C46—C41—C42—C47 | −169.7 (3) |
O2—B1—C8—C12 | 140.3 (3) | C41—C42—C43—C44 | −1.9 (4) |
C10—N1—C9—C8 | 1.8 (4) | C47—C42—C43—C44 | 172.4 (3) |
C12—C8—C9—N1 | −0.8 (4) | C42—C43—C44—O44 | 179.3 (3) |
B1—C8—C9—N1 | −177.6 (3) | C42—C43—C44—C45 | −1.9 (4) |
C9—N1—C10—C11 | −1.2 (4) | O44—C44—C45—C46 | −178.2 (2) |
N1—C10—C11—C12 | −0.5 (4) | C43—C44—C45—C46 | 3.0 (4) |
C10—C11—C12—C8 | 1.6 (4) | C44—C45—C46—C41 | −0.2 (4) |
C9—C8—C12—C11 | −0.9 (4) | O41—C41—C46—C45 | 177.7 (2) |
B1—C8—C12—C11 | 175.9 (3) | C42—C41—C46—C45 | −3.5 (4) |
O25—B21—O21—C21 | −76.3 (3) | B41—O42—C47—O43 | 169.5 (2) |
O22—B21—O21—C21 | 42.6 (3) | B41—O42—C47—C42 | −14.0 (4) |
C28—B21—O21—C21 | 160.5 (2) | C41—C42—C47—O43 | 163.3 (3) |
O25—B21—O22—C27 | 83.4 (3) | C43—C42—C47—O43 | −11.1 (4) |
O21—B21—O22—C27 | −34.4 (3) | C41—C42—C47—O42 | −13.1 (4) |
C28—B21—O22—C27 | −153.7 (2) | C43—C42—C47—O42 | 172.5 (2) |
B21—O21—C21—C22 | −26.6 (4) | O45—B41—C48—C52 | 98.1 (3) |
B21—O21—C21—C26 | 154.9 (3) | O41—B41—C48—C52 | −26.9 (4) |
O21—C21—C22—C23 | 179.0 (2) | O42—B41—C48—C52 | −147.2 (3) |
C26—C21—C22—C23 | −2.5 (4) | O45—B41—C48—C49 | −79.6 (4) |
O21—C21—C22—C27 | −2.1 (4) | O41—B41—C48—C49 | 155.4 (3) |
C26—C21—C22—C27 | 176.4 (2) | O42—B41—C48—C49 | 35.0 (4) |
C21—C22—C23—C24 | −0.9 (4) | C50—N41—C49—C48 | −2.0 (5) |
C27—C22—C23—C24 | −179.8 (3) | C52—C48—C49—N41 | −0.8 (4) |
C22—C23—C24—O24 | −177.1 (2) | B41—C48—C49—N41 | 177.2 (3) |
C22—C23—C24—C25 | 3.8 (4) | C49—N41—C50—C51 | 3.3 (5) |
O24—C24—C25—C26 | 177.5 (2) | N41—C50—C51—C52 | −1.8 (5) |
C23—C24—C25—C26 | −3.3 (4) | C50—C51—C52—C48 | −1.0 (5) |
C24—C25—C26—C21 | −0.1 (4) | C49—C48—C52—C51 | 2.2 (4) |
O21—C21—C26—C25 | −178.4 (2) | B41—C48—C52—C51 | −175.6 (3) |
C22—C21—C26—C25 | 3.0 (4) | | |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
O62—H62A···O25 | 0.84 | 1.86 | 2.702 (4) | 174 |
O45—H45′···O23i | 0.84 | 1.94 | 2.777 (2) | 177 |
O4—H4′···O45ii | 0.84 | 1.77 | 2.579 (3) | 162 |
O61—H61A···O43ii | 0.84 | 1.95 | 2.749 (3) | 159 |
O5—H5′···O3iii | 0.84 | 1.93 | 2.773 (2) | 178 |
O24—H24′···O5iv | 0.84 | 1.8 | 2.638 (3) | 179 |
O25—H25′···O4v | 0.84 | 1.95 | 2.791 (3) | 173 |
O62—H62B···O24vi | 0.84 | 2.02 | 2.810 (4) | 157 |
O44—H44′···O61vii | 0.84 | 1.82 | 2.656 (3) | 177 |
O61—H61B···O62viii | 0.84 | 1.83 | 2.673 (3) | 178 |
N1—H1′···O23i | 0.84 | 1.89 | 2.725 (4) | 176 |
N21—H21′···O3ix | 0.84 | 1.89 | 2.727 (4) | 170 |
N41—H41′···O43x | 0.84 | 1.92 | 2.749 (5) | 169 |
C11—H11···O62iv | 0.95 | 2.57 | 3.348 (4) | 140 |
C23—H23···O5iv | 0.95 | 2.59 | 3.215 (4) | 123 |
C43—H43···O61vii | 0.95 | 2.57 | 3.201 (4) | 124 |
Symmetry codes: (i) x+1, y, z; (ii) x, y, z−1; (iii) −x+2, −y+1, −z; (iv) −x+1, −y+1, −z+1; (v) −x+1, −y+1, −z; (vi) −x, −y+2, −z+1; (vii) −x+1, −y, −z+1; (viii) x, y−1, z; (ix) x−1, y, z; (x) −x+1, −y+1, −z+2. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
O62—H62A···O25 | 0.84 | 1.86 | 2.702 (4) | 174 |
O45—H45'···O23i | 0.84 | 1.94 | 2.777 (2) | 177 |
O4—H4'···O45ii | 0.84 | 1.77 | 2.579 (3) | 162 |
O61—H61A···O43ii | 0.84 | 1.95 | 2.749 (3) | 159 |
O5—H5'···O3iii | 0.84 | 1.93 | 2.773 (2) | 178 |
O24—H24'···O5iv | 0.84 | 1.8 | 2.638 (3) | 179 |
O25—H25'···O4v | 0.84 | 1.95 | 2.791 (3) | 173 |
O62—H62B···O24vi | 0.84 | 2.02 | 2.810 (4) | 157 |
O44—H44'···O61vii | 0.84 | 1.82 | 2.656 (3) | 177 |
O61—H61B···O62viii | 0.84 | 1.83 | 2.673 (3) | 178 |
N1—H1'···O23i | 0.84 | 1.89 | 2.725 (4) | 176 |
N21—H21'···O3ix | 0.84 | 1.89 | 2.727 (4) | 170 |
N41—H41'···O43x | 0.84 | 1.92 | 2.749 (5) | 169 |
C11—H11···O62iv | 0.95 | 2.57 | 3.348 (4) | 140 |
C23—H23···O5iv | 0.95 | 2.59 | 3.215 (4) | 123 |
C43—H43···O61vii | 0.95 | 2.57 | 3.201 (4) | 124 |
Symmetry codes: (i) x+1, y, z; (ii) x, y, z−1; (iii) −x+2, −y+1, −z; (iv) −x+1, −y+1, −z+1; (v) −x+1, −y+1, −z; (vi) −x, −y+2, −z+1; (vii) −x+1, −y, −z+1; (viii) x, y−1, z; (ix) x−1, y, z; (x) −x+1, −y+1, −z+2. |
The O—H groups of boronic acids are able to react with alcohols to give boronic esters through the formation of covalent B–O bonds (Fujita et al., 2008). The high thermodynamic stability of boronic esters has been employed for the formation of cyclo-oligomeric and polymeric boron compounds with potential applications in gas storage and separation (Höpfl et al., 2002; Severin et al., 2009). Herein, we report on the solid-state structure of a new boronic ester formed between 2,5-dihydroxybenzoic acid and 3-pyridine boronic acid.
The molecular components of the title compound, 6-hydroxy-2-(pyridinium-3-yl)-4H-benzo-1,3,2-dioxaborininato-4-one) 0.67-hydrate, are shown in Fig. 1. The asymmetric unit contains three crystallographically independent ester molecules with similar conformations and two water molecules. The six-membered heterocyclic rings in the boronic esters have half-chair conformations, and the deviation of the B atom from the boronate mean planes range from 0.456 (3) to 0.657 (3) Å. The B atoms have tetrahedral coordination environments with B—O and B—C bond distances of 1.446 (4)–1.539 (3) Å and 1.590 (5)–1.609 (5) Å, respectively. The tetrahedral character of the boron atoms was evidenced also by 11B-NMR spectroscopy, giving a chemical shift of 3.8 p.p.m. (Barba et al., 2010). In the crystal, the molecular entities are linked into a three-dimensional network by a large number of O—H···O and N+—H···-O hydrogen bonds. Crystal packing is accomplished by additional C—H···O and π–π contacts (Table 1 and Fig 2), of which the latter are formed between pyridinium and phenyl rings. The centroid-centroid distances are Cg1···Cg2i = 3.774 (4) Å, Cg1···Cg4ii = 3.787 (4) Å and Cg2···Cg3iii = 3.621 (4) Å, where Cg1, Cg2, Cg3 and Cg4 are the centroids of C1–C6, N21/C28–C32, C41–C46 and N41/C48–C52 rings, respectively. [symmetry codes: (i) 1 - x, 1 - y, -z; (ii) 1 - x, 1 - y, 1 - z; (iii) -x, 1 - y, 1 - z.]