metal-organic compounds
Aqua[2-(3-carboxy-5-carboxylatophenoxy)acetato-κO1]bis(1,10-phenanthroline-κ2N,N′)manganese(II) dihydrate
aZhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, College of Chemistry and Life Science, Zhejiang Normal University, Jinhua, Zhejiang 321004, People's Republic of China
*Correspondence e-mail: sky37@zjnu.cn
In the title complex, [Mn(C10H6O7)(C12H8N2)2(H2O)]·2H2O, the MnII atom is coordinated by two O atoms from one 2-(3-carboxy-5-carboxylatophenoxy)acetate (HOABDC2−) dianion and one water molecule and by four N atoms from two 1,10-phenanthroline (phen) ligands within a distorted octahedral geometry. O—H⋯O hydrogen bonding between –COOH and –COO− groups of adjacent molecules and between carboxylate groups and coordinated and uncoordinated water molecules leads to a three-dimensional structure which is further stabilized by weak π–π interactions of adjacent phen ligands with centroid–centroid separations of 4.2932 (1) Å.
Related literature
For related structures, see: Cao et al. (2004, 2007); Cheng et al. (2004); Murugavel et al. (2002); Zhang et al. (2002).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2006); cell SAINT (Bruker, 2006); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2007); software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536810048142/wm2428sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810048142/wm2428Isup2.hkl
All reagents were of analytical reagent grade and were used without further purification. A mixture of H3OABDC (0.1205 g, 0.5 mmol), Mn(NO3)2.6H2O (0.0976 g, 0.34 mmol), phen (0.1986 g, 0.01 mmol), and NaOH (0.0101 g, 0.25 mmol) was dissolved in purified water (15 ml), and reacted in a 25 ml stainless steel reactor with a telflon liner and heated at 433 K for 72 h, and then cooled to room temperature over 3 days. Then, the reactor was cooled to room temperature at a speed of 5 K.h-1. Yellow single crystals of title compound were obtained by slow evaporation of the filtrate over a few days (yield 40.1% based on H3OABDC).
The carbon-bound H-atoms were positioned geometrically and included in the
using a riding model [C—H 0.93 Å Uiso(H) = 1.2Ueq(C)]. The oxygen-bound H-atoms were located in difference Fourier maps and were refined with the O—H distances restrained to 0.82 Å [Uiso(H) = 1.2Ueq(O)].Many aromatic polycarboxylate ligands have been employed as organic skeletons in the formation of various metal-organic compounds. To the best of our knowledge, aromatic polycarboxylate ligand with both rigid and flexible carboxyl groups are less reported. In comparison with rigid aromatic multicarboxylic ligands (Cheng et al., 2004; Murugavel et al., 2002; Zhang et al., 2002), 5-oxyacetic-1,3-benzenebiscarboxylic acid (H3OABDC) provides two rigid carboxyl groups and one flexible oxyacetato group (Cao et al., 2004, 2007). Herein, we report the synthesis and structure of a new MnII compound based on the H3OABDC ligand, [Mn(C10H6O7)(C12H8N2)2(H2O)].2H2O, (I).
Compound (I) consists of one MnII atom, one HOABDC2- dianion, two phenanthroline (phen) ligands, one coordinated and two lattice water molecules, as shown in Fig. 1. The MnII atom is six-coordinated by four nitrogen atoms from two phen ligands (Mn—N 2.2462 (17)–2.2974 (16) Å), one oxygen atom from one flexible carboxyl group of the HOABDC2- anion (Mn—O 2.1352 (13) Å) and one water molecule (Mn—O 2.1820 (15) Å) in a distorted octahedral geometry. It is notable that only the flexible carboxylato group participates in a monodentately coordinating mode to the MnII atom. The dianion is not planar as indicated by the dihedral angles (8.2 (1)–10.17 (5) °) between the benzene ring and the two carboxy groups, as well as the torsion angle (69.0 (2) °) involving the benzene ring and the OCH2COO2 group. The complex molecules are connected to each other through O—H···O interactions between the two rigid carboxyl groups of the HOABDC2- dianion to form a "T"-shaped chain (Fig. 2). Adjacent chains are further linked with each other via weak π–π interactions between phen groups (centroid—centroid separation between planes is 4.2932 (1) Å) and O—H···O hydrogen bonds involving both coordinated and uncoordinated water molecules (Fig. 3).
For related structures, see: Cao et al. (2004, 2007); Cheng et al. (2004); Murugavel et al. (2002); Zhang et al. (2002).
Data collection: APEX2 (Bruker, 2006); cell
SAINT (Bruker, 2006); data reduction: SAINT (Bruker, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXS97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2007); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. The molecular structure of the title compound. Displacement ellipsoids are drawn at the 30% probability level. | |
Fig. 2. The "T"-shaped chain in the title compound. | |
Fig. 3. The three-dimensional framework of the title compound with hydrogen bonding and π–π interactions (dashed lines). |
[Mn(C10H6O7)(C12H8N2)2(H2O)]·2H2O | F(000) = 1460 |
Mr = 707.54 | Dx = 1.502 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 9990 reflections |
a = 8.1024 (2) Å | θ = 1.5–27.7° |
b = 22.3106 (6) Å | µ = 0.49 mm−1 |
c = 17.5381 (5) Å | T = 296 K |
β = 99.212 (2)° | Block, yellow |
V = 3129.46 (14) Å3 | 0.29 × 0.24 × 0.10 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 7282 independent reflections |
Radiation source: fine-focus sealed tube | 5127 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.050 |
ω scans | θmax = 27.7°, θmin = 1.5° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −10→10 |
Tmin = 0.871, Tmax = 0.955 | k = −28→29 |
69826 measured reflections | l = −22→21 |
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)] = 0.038 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.117 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | w = 1/[σ2(Fo2) + (0.0638P)2 + 0.5366P] where P = (Fo2 + 2Fc2)/3 |
7282 reflections | (Δ/σ)max = 0.001 |
463 parameters | Δρmax = 0.41 e Å−3 |
10 restraints | Δρmin = −0.26 e Å−3 |
[Mn(C10H6O7)(C12H8N2)2(H2O)]·2H2O | V = 3129.46 (14) Å3 |
Mr = 707.54 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 8.1024 (2) Å | µ = 0.49 mm−1 |
b = 22.3106 (6) Å | T = 296 K |
c = 17.5381 (5) Å | 0.29 × 0.24 × 0.10 mm |
β = 99.212 (2)° |
Bruker APEXII CCD diffractometer | 7282 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 5127 reflections with I > 2σ(I) |
Tmin = 0.871, Tmax = 0.955 | Rint = 0.050 |
69826 measured reflections |
R[F2 > 2σ(F2)] = 0.038 | 10 restraints |
wR(F2) = 0.117 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.00 | Δρmax = 0.41 e Å−3 |
7282 reflections | Δρmin = −0.26 e Å−3 |
463 parameters |
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. |
x | y | z | Uiso*/Ueq | ||
Mn | 0.20775 (3) | 0.527200 (13) | 0.259979 (16) | 0.03977 (10) | |
O1W | 0.3442 (2) | 0.58989 (7) | 0.19761 (9) | 0.0548 (4) | |
H1WA | 0.302 (3) | 0.6150 (9) | 0.1656 (12) | 0.066* | |
H1WB | 0.395 (3) | 0.5651 (9) | 0.1744 (13) | 0.066* | |
O1 | 0.1064 (2) | 0.31086 (7) | 0.08413 (8) | 0.0585 (4) | |
H | 0.050 (3) | 0.2960 (10) | 0.0421 (11) | 0.070* | |
O2W | 0.3384 (2) | 0.69978 (11) | 0.94327 (11) | 0.0845 (6) | |
H2WB | 0.310 (4) | 0.6916 (14) | 0.9859 (11) | 0.101* | |
H2WA | 0.254 (3) | 0.7136 (14) | 0.9152 (14) | 0.101* | |
O2 | −0.0390 (2) | 0.25197 (9) | 0.15014 (9) | 0.0759 (5) | |
O3W | 0.1249 (3) | 0.72517 (11) | 0.4755 (2) | 0.1336 (11) | |
H3WB | 0.209 (3) | 0.7467 (16) | 0.486 (3) | 0.160* | |
H3WA | 0.042 (3) | 0.7476 (16) | 0.462 (3) | 0.160* | |
O3 | 0.4840 (2) | 0.23215 (7) | 0.46173 (8) | 0.0724 (5) | |
O4 | 0.2717 (2) | 0.17586 (7) | 0.40925 (8) | 0.0608 (4) | |
O5 | 0.62133 (16) | 0.36920 (6) | 0.26636 (7) | 0.0440 (3) | |
O6 | 0.40064 (17) | 0.46344 (6) | 0.25174 (8) | 0.0455 (3) | |
O7 | 0.4781 (2) | 0.49201 (7) | 0.14154 (9) | 0.0671 (5) | |
N1 | 0.3104 (2) | 0.56296 (8) | 0.37776 (10) | 0.0517 (4) | |
N2 | 0.1241 (2) | 0.46239 (7) | 0.34659 (9) | 0.0444 (4) | |
N3 | −0.0037 (2) | 0.59680 (7) | 0.24904 (10) | 0.0474 (4) | |
N4 | 0.01674 (19) | 0.49978 (7) | 0.15726 (9) | 0.0424 (4) | |
C1 | 0.2283 (2) | 0.28589 (8) | 0.21010 (10) | 0.0395 (4) | |
C2 | 0.2303 (2) | 0.25059 (8) | 0.27511 (10) | 0.0415 (4) | |
H2 | 0.1429 | 0.2243 | 0.2786 | 0.050* | |
C3 | 0.3647 (2) | 0.25495 (8) | 0.33519 (10) | 0.0387 (4) | |
C4 | 0.4927 (2) | 0.29499 (8) | 0.32972 (10) | 0.0385 (4) | |
H4 | 0.5824 | 0.2978 | 0.3699 | 0.046* | |
C5 | 0.4888 (2) | 0.33098 (8) | 0.26510 (10) | 0.0366 (4) | |
C6 | 0.3576 (2) | 0.32568 (8) | 0.20429 (10) | 0.0387 (4) | |
H6 | 0.3560 | 0.3486 | 0.1599 | 0.046* | |
C7 | 0.0849 (3) | 0.28103 (9) | 0.14504 (11) | 0.0441 (4) | |
C8 | 0.3719 (3) | 0.21739 (9) | 0.40661 (10) | 0.0452 (5) | |
C9 | 0.6173 (2) | 0.40997 (9) | 0.20347 (11) | 0.0436 (4) | |
H9B | 0.5972 | 0.3873 | 0.1557 | 0.052* | |
H9A | 0.7266 | 0.4285 | 0.2069 | 0.052* | |
C10 | 0.4870 (2) | 0.45928 (8) | 0.19925 (11) | 0.0391 (4) | |
C11 | 0.4049 (3) | 0.61143 (11) | 0.39264 (16) | 0.0699 (7) | |
H11 | 0.4292 | 0.6342 | 0.3514 | 0.084* | |
C12 | 0.4691 (4) | 0.62961 (14) | 0.4676 (2) | 0.0944 (11) | |
H12 | 0.5327 | 0.6644 | 0.4761 | 0.113* | |
C13 | 0.4381 (4) | 0.59635 (16) | 0.5274 (2) | 0.0949 (12) | |
H13 | 0.4841 | 0.6074 | 0.5775 | 0.114* | |
C14 | 0.3372 (3) | 0.54517 (13) | 0.51546 (14) | 0.0710 (8) | |
C15 | 0.2971 (4) | 0.50771 (19) | 0.57607 (15) | 0.0959 (12) | |
H15 | 0.3358 | 0.5179 | 0.6272 | 0.115* | |
C16 | 0.2060 (4) | 0.45879 (19) | 0.56048 (16) | 0.0913 (11) | |
H16 | 0.1819 | 0.4354 | 0.6012 | 0.110* | |
C17 | 0.1430 (3) | 0.44057 (14) | 0.48282 (14) | 0.0667 (7) | |
C18 | 0.0533 (3) | 0.38851 (15) | 0.46418 (18) | 0.0842 (9) | |
H18 | 0.0275 | 0.3638 | 0.5033 | 0.101* | |
C19 | 0.0027 (3) | 0.37328 (13) | 0.38935 (19) | 0.0801 (8) | |
H19 | −0.0560 | 0.3379 | 0.3767 | 0.096* | |
C20 | 0.0403 (3) | 0.41167 (11) | 0.33149 (14) | 0.0596 (6) | |
H20 | 0.0050 | 0.4011 | 0.2802 | 0.072* | |
C21 | 0.1775 (2) | 0.47682 (10) | 0.42138 (11) | 0.0482 (5) | |
C22 | 0.2753 (3) | 0.52968 (10) | 0.43802 (12) | 0.0521 (5) | |
C23 | −0.0184 (3) | 0.64320 (10) | 0.29509 (14) | 0.0587 (6) | |
H23 | 0.0592 | 0.6470 | 0.3400 | 0.070* | |
C24 | −0.1426 (3) | 0.68609 (11) | 0.27993 (18) | 0.0715 (7) | |
H24 | −0.1510 | 0.7168 | 0.3150 | 0.086* | |
C25 | −0.2517 (3) | 0.68242 (11) | 0.21291 (19) | 0.0729 (8) | |
H25 | −0.3346 | 0.7113 | 0.2013 | 0.088* | |
C26 | −0.2408 (3) | 0.63540 (10) | 0.16083 (14) | 0.0585 (6) | |
C27 | −0.3498 (3) | 0.62863 (13) | 0.08932 (17) | 0.0724 (8) | |
H27 | −0.4302 | 0.6578 | 0.0740 | 0.087* | |
C28 | −0.3393 (3) | 0.58124 (14) | 0.04358 (15) | 0.0701 (7) | |
H28 | −0.4115 | 0.5784 | −0.0032 | 0.084* | |
C29 | −0.2185 (3) | 0.53454 (11) | 0.06531 (12) | 0.0531 (5) | |
C30 | −0.2098 (3) | 0.48226 (12) | 0.02292 (13) | 0.0603 (6) | |
H30 | −0.2854 | 0.4761 | −0.0222 | 0.072* | |
C31 | −0.0914 (3) | 0.44008 (11) | 0.04712 (12) | 0.0567 (6) | |
H31 | −0.0862 | 0.4048 | 0.0194 | 0.068* | |
C32 | 0.0217 (3) | 0.45103 (10) | 0.11419 (12) | 0.0487 (5) | |
H32 | 0.1048 | 0.4228 | 0.1296 | 0.058* | |
C33 | −0.1037 (2) | 0.54120 (9) | 0.13409 (11) | 0.0441 (5) | |
C34 | −0.1145 (2) | 0.59240 (9) | 0.18283 (12) | 0.0465 (5) |
U11 | U22 | U33 | U12 | U13 | U23 | |
Mn | 0.04202 (17) | 0.03954 (18) | 0.03701 (17) | 0.00304 (12) | 0.00406 (12) | 0.00051 (12) |
O1W | 0.0625 (10) | 0.0436 (9) | 0.0606 (10) | 0.0093 (7) | 0.0173 (8) | 0.0131 (7) |
O1 | 0.0702 (10) | 0.0685 (10) | 0.0302 (7) | −0.0123 (8) | −0.0114 (7) | 0.0053 (7) |
O2W | 0.0594 (11) | 0.1263 (17) | 0.0674 (12) | 0.0024 (11) | 0.0084 (9) | 0.0115 (12) |
O2 | 0.0634 (10) | 0.0999 (13) | 0.0555 (10) | −0.0298 (10) | −0.0173 (8) | 0.0241 (9) |
O3W | 0.0990 (17) | 0.0797 (17) | 0.230 (3) | −0.0064 (13) | 0.049 (2) | 0.0240 (19) |
O3 | 0.1013 (13) | 0.0683 (10) | 0.0371 (8) | −0.0295 (10) | −0.0207 (8) | 0.0144 (7) |
O4 | 0.0910 (12) | 0.0531 (9) | 0.0355 (7) | −0.0239 (8) | 0.0016 (7) | 0.0043 (6) |
O5 | 0.0392 (7) | 0.0418 (7) | 0.0481 (7) | −0.0008 (6) | −0.0016 (6) | 0.0087 (6) |
O6 | 0.0492 (8) | 0.0440 (8) | 0.0460 (8) | 0.0077 (6) | 0.0158 (6) | 0.0066 (6) |
O7 | 0.0841 (12) | 0.0664 (10) | 0.0565 (9) | 0.0243 (9) | 0.0289 (8) | 0.0261 (8) |
N1 | 0.0498 (10) | 0.0476 (10) | 0.0541 (11) | 0.0055 (8) | −0.0022 (8) | −0.0106 (8) |
N2 | 0.0386 (8) | 0.0523 (10) | 0.0422 (9) | 0.0035 (7) | 0.0058 (7) | 0.0033 (7) |
N3 | 0.0497 (10) | 0.0431 (9) | 0.0516 (10) | 0.0056 (8) | 0.0151 (8) | 0.0022 (8) |
N4 | 0.0403 (9) | 0.0461 (9) | 0.0399 (9) | 0.0027 (7) | 0.0038 (7) | 0.0026 (7) |
C1 | 0.0475 (10) | 0.0401 (10) | 0.0285 (9) | 0.0004 (8) | −0.0016 (8) | −0.0007 (7) |
C2 | 0.0510 (11) | 0.0397 (11) | 0.0323 (9) | −0.0035 (8) | 0.0018 (8) | 0.0000 (7) |
C3 | 0.0534 (11) | 0.0328 (9) | 0.0281 (9) | 0.0006 (8) | 0.0007 (8) | −0.0008 (7) |
C4 | 0.0455 (10) | 0.0357 (9) | 0.0307 (9) | 0.0025 (8) | −0.0044 (8) | −0.0017 (7) |
C5 | 0.0405 (10) | 0.0316 (9) | 0.0364 (9) | 0.0037 (8) | 0.0026 (8) | −0.0007 (7) |
C6 | 0.0480 (10) | 0.0374 (10) | 0.0292 (9) | 0.0023 (8) | 0.0018 (8) | 0.0027 (7) |
C7 | 0.0522 (12) | 0.0429 (11) | 0.0338 (10) | −0.0017 (9) | −0.0032 (8) | −0.0008 (8) |
C8 | 0.0643 (13) | 0.0374 (10) | 0.0312 (9) | −0.0026 (9) | −0.0009 (9) | −0.0012 (8) |
C9 | 0.0396 (10) | 0.0447 (11) | 0.0475 (11) | 0.0025 (8) | 0.0098 (8) | 0.0069 (9) |
C10 | 0.0402 (10) | 0.0389 (10) | 0.0374 (10) | −0.0016 (8) | 0.0035 (8) | 0.0038 (8) |
C11 | 0.0628 (15) | 0.0511 (14) | 0.0883 (18) | 0.0051 (11) | −0.0109 (13) | −0.0199 (13) |
C12 | 0.0787 (19) | 0.0655 (19) | 0.123 (3) | 0.0192 (15) | −0.0331 (19) | −0.0488 (19) |
C13 | 0.086 (2) | 0.099 (2) | 0.085 (2) | 0.0432 (19) | −0.0331 (17) | −0.0548 (19) |
C14 | 0.0646 (15) | 0.0963 (19) | 0.0463 (13) | 0.0378 (15) | −0.0087 (11) | −0.0240 (13) |
C15 | 0.091 (2) | 0.157 (3) | 0.0361 (14) | 0.062 (2) | −0.0009 (14) | −0.0113 (18) |
C16 | 0.084 (2) | 0.151 (3) | 0.0415 (15) | 0.046 (2) | 0.0161 (14) | 0.0221 (18) |
C17 | 0.0513 (13) | 0.098 (2) | 0.0538 (14) | 0.0242 (14) | 0.0184 (11) | 0.0229 (13) |
C18 | 0.0651 (17) | 0.105 (2) | 0.087 (2) | 0.0095 (16) | 0.0241 (15) | 0.0476 (18) |
C19 | 0.0566 (15) | 0.0713 (18) | 0.113 (2) | −0.0077 (13) | 0.0156 (15) | 0.0305 (17) |
C20 | 0.0483 (12) | 0.0599 (14) | 0.0690 (15) | −0.0054 (11) | 0.0044 (11) | 0.0071 (12) |
C21 | 0.0389 (10) | 0.0679 (14) | 0.0384 (10) | 0.0157 (10) | 0.0076 (8) | 0.0051 (9) |
C22 | 0.0464 (11) | 0.0686 (14) | 0.0386 (10) | 0.0215 (10) | −0.0013 (9) | −0.0099 (10) |
C23 | 0.0652 (14) | 0.0488 (13) | 0.0669 (14) | 0.0059 (11) | 0.0254 (12) | −0.0023 (11) |
C24 | 0.0753 (17) | 0.0474 (14) | 0.101 (2) | 0.0112 (12) | 0.0437 (17) | −0.0015 (13) |
C25 | 0.0591 (15) | 0.0503 (14) | 0.117 (2) | 0.0191 (11) | 0.0375 (16) | 0.0205 (15) |
C26 | 0.0431 (12) | 0.0552 (13) | 0.0803 (16) | 0.0092 (10) | 0.0198 (11) | 0.0257 (12) |
C27 | 0.0446 (13) | 0.0770 (18) | 0.095 (2) | 0.0126 (12) | 0.0091 (13) | 0.0396 (16) |
C28 | 0.0424 (12) | 0.098 (2) | 0.0662 (16) | −0.0008 (13) | −0.0025 (11) | 0.0373 (15) |
C29 | 0.0380 (10) | 0.0736 (15) | 0.0468 (12) | −0.0056 (10) | 0.0042 (9) | 0.0199 (11) |
C30 | 0.0480 (12) | 0.0876 (18) | 0.0423 (11) | −0.0211 (12) | −0.0019 (10) | 0.0091 (12) |
C31 | 0.0617 (14) | 0.0635 (14) | 0.0444 (12) | −0.0183 (12) | 0.0066 (10) | −0.0044 (10) |
C32 | 0.0491 (12) | 0.0504 (12) | 0.0458 (11) | −0.0040 (9) | 0.0055 (9) | −0.0011 (9) |
C33 | 0.0360 (10) | 0.0530 (12) | 0.0439 (11) | −0.0003 (9) | 0.0083 (8) | 0.0136 (9) |
C34 | 0.0389 (10) | 0.0467 (11) | 0.0567 (12) | 0.0064 (9) | 0.0162 (9) | 0.0145 (9) |
Mn—O6 | 2.1352 (13) | C9—H9A | 0.9700 |
Mn—O1W | 2.1820 (15) | C11—C12 | 1.395 (4) |
Mn—N1 | 2.2462 (17) | C11—H11 | 0.9300 |
Mn—N4 | 2.2633 (16) | C12—C13 | 1.341 (5) |
Mn—N2 | 2.2776 (16) | C12—H12 | 0.9300 |
Mn—N3 | 2.2974 (16) | C13—C14 | 1.400 (5) |
O1W—H1WA | 0.829 (15) | C13—H13 | 0.9300 |
O1W—H1WB | 0.834 (15) | C14—C22 | 1.413 (3) |
O1—C7 | 1.294 (2) | C14—C15 | 1.430 (5) |
O1—H | 0.867 (16) | C15—C16 | 1.322 (5) |
O2W—H2WB | 0.838 (16) | C15—H15 | 0.9300 |
O2W—H2WA | 0.834 (17) | C16—C17 | 1.435 (4) |
O2—C7 | 1.210 (2) | C16—H16 | 0.9300 |
O3W—H3WB | 0.831 (18) | C17—C18 | 1.381 (4) |
O3W—H3WA | 0.839 (18) | C17—C21 | 1.411 (3) |
O3—C8 | 1.260 (2) | C18—C19 | 1.354 (4) |
O4—C8 | 1.238 (2) | C18—H18 | 0.9300 |
O5—C5 | 1.369 (2) | C19—C20 | 1.398 (3) |
O5—C9 | 1.426 (2) | C19—H19 | 0.9300 |
O6—C10 | 1.246 (2) | C20—H20 | 0.9300 |
O7—C10 | 1.241 (2) | C21—C22 | 1.425 (3) |
N1—C11 | 1.326 (3) | C23—C24 | 1.383 (3) |
N1—C22 | 1.359 (3) | C23—H23 | 0.9300 |
N2—C20 | 1.324 (3) | C24—C25 | 1.355 (4) |
N2—C21 | 1.353 (3) | C24—H24 | 0.9300 |
N3—C23 | 1.330 (3) | C25—C26 | 1.403 (4) |
N3—C34 | 1.353 (3) | C25—H25 | 0.9300 |
N4—C32 | 1.328 (3) | C26—C34 | 1.410 (3) |
N4—C33 | 1.358 (2) | C26—C27 | 1.421 (4) |
C1—C2 | 1.384 (2) | C27—C28 | 1.338 (4) |
C1—C6 | 1.389 (3) | C27—H27 | 0.9300 |
C1—C7 | 1.496 (2) | C28—C29 | 1.438 (3) |
C2—C3 | 1.392 (2) | C28—H28 | 0.9300 |
C2—H2 | 0.9300 | C29—C30 | 1.391 (3) |
C3—C4 | 1.383 (3) | C29—C33 | 1.408 (3) |
C3—C8 | 1.500 (2) | C30—C31 | 1.362 (3) |
C4—C5 | 1.385 (2) | C30—H30 | 0.9300 |
C4—H4 | 0.9300 | C31—C32 | 1.392 (3) |
C5—C6 | 1.385 (2) | C31—H31 | 0.9300 |
C6—H6 | 0.9300 | C32—H32 | 0.9300 |
C9—C10 | 1.519 (3) | C33—C34 | 1.438 (3) |
C9—H9B | 0.9700 | ||
O6—Mn—O1W | 87.60 (5) | C12—C11—H11 | 118.7 |
O6—Mn—N1 | 97.56 (6) | C13—C12—C11 | 119.2 (3) |
O1W—Mn—N1 | 95.19 (7) | C13—C12—H12 | 120.4 |
O6—Mn—N4 | 100.41 (6) | C11—C12—H12 | 120.4 |
O1W—Mn—N4 | 96.37 (6) | C12—C13—C14 | 120.8 (3) |
N1—Mn—N4 | 158.98 (6) | C12—C13—H13 | 119.6 |
O6—Mn—N2 | 85.50 (5) | C14—C13—H13 | 119.6 |
O1W—Mn—N2 | 165.93 (6) | C13—C14—C22 | 116.9 (3) |
N1—Mn—N2 | 73.63 (7) | C13—C14—C15 | 124.2 (3) |
N4—Mn—N2 | 96.92 (6) | C22—C14—C15 | 118.9 (3) |
O6—Mn—N3 | 171.40 (6) | C16—C15—C14 | 121.0 (3) |
O1W—Mn—N3 | 87.47 (6) | C16—C15—H15 | 119.5 |
N1—Mn—N3 | 89.90 (6) | C14—C15—H15 | 119.5 |
N4—Mn—N3 | 73.17 (6) | C15—C16—C17 | 122.2 (3) |
N2—Mn—N3 | 100.78 (6) | C15—C16—H16 | 118.9 |
Mn—O1W—H1WA | 125.9 (17) | C17—C16—H16 | 118.9 |
Mn—O1W—H1WB | 98.6 (17) | C18—C17—C21 | 117.6 (2) |
H1WA—O1W—H1WB | 107.6 (19) | C18—C17—C16 | 123.8 (3) |
C7—O1—H | 112.5 (17) | C21—C17—C16 | 118.6 (3) |
H2WB—O2W—H2WA | 107 (2) | C19—C18—C17 | 120.4 (2) |
H3WB—O3W—H3WA | 108 (3) | C19—C18—H18 | 119.8 |
C5—O5—C9 | 117.66 (14) | C17—C18—H18 | 119.8 |
C10—O6—Mn | 127.12 (12) | C18—C19—C20 | 118.8 (3) |
C11—N1—C22 | 118.6 (2) | C18—C19—H19 | 120.6 |
C11—N1—Mn | 126.00 (18) | C20—C19—H19 | 120.6 |
C22—N1—Mn | 115.37 (14) | N2—C20—C19 | 122.9 (2) |
C20—N2—C21 | 118.14 (19) | N2—C20—H20 | 118.6 |
C20—N2—Mn | 127.37 (15) | C19—C20—H20 | 118.6 |
C21—N2—Mn | 114.35 (14) | N2—C21—C17 | 122.2 (2) |
C23—N3—C34 | 117.76 (18) | N2—C21—C22 | 118.48 (19) |
C23—N3—Mn | 127.85 (15) | C17—C21—C22 | 119.3 (2) |
C34—N3—Mn | 113.98 (13) | N1—C22—C14 | 121.9 (2) |
C32—N4—C33 | 118.21 (17) | N1—C22—C21 | 118.16 (18) |
C32—N4—Mn | 126.51 (13) | C14—C22—C21 | 120.0 (2) |
C33—N4—Mn | 114.90 (13) | N3—C23—C24 | 123.7 (2) |
C2—C1—C6 | 120.96 (17) | N3—C23—H23 | 118.1 |
C2—C1—C7 | 119.50 (17) | C24—C23—H23 | 118.1 |
C6—C1—C7 | 119.54 (16) | C25—C24—C23 | 118.6 (2) |
C1—C2—C3 | 119.24 (17) | C25—C24—H24 | 120.7 |
C1—C2—H2 | 120.4 | C23—C24—H24 | 120.7 |
C3—C2—H2 | 120.4 | C24—C25—C26 | 120.6 (2) |
C4—C3—C2 | 119.79 (16) | C24—C25—H25 | 119.7 |
C4—C3—C8 | 119.30 (16) | C26—C25—H25 | 119.7 |
C2—C3—C8 | 120.91 (17) | C25—C26—C34 | 116.7 (2) |
C3—C4—C5 | 120.79 (16) | C25—C26—C27 | 124.0 (2) |
C3—C4—H4 | 119.6 | C34—C26—C27 | 119.3 (2) |
C5—C4—H4 | 119.6 | C28—C27—C26 | 121.5 (2) |
O5—C5—C4 | 115.65 (15) | C28—C27—H27 | 119.2 |
O5—C5—C6 | 124.69 (16) | C26—C27—H27 | 119.2 |
C4—C5—C6 | 119.64 (17) | C27—C28—C29 | 121.3 (2) |
C5—C6—C1 | 119.53 (16) | C27—C28—H28 | 119.4 |
C5—C6—H6 | 120.2 | C29—C28—H28 | 119.4 |
C1—C6—H6 | 120.2 | C30—C29—C33 | 117.6 (2) |
O2—C7—O1 | 124.02 (18) | C30—C29—C28 | 123.8 (2) |
O2—C7—C1 | 122.31 (17) | C33—C29—C28 | 118.6 (2) |
O1—C7—C1 | 113.67 (17) | C31—C30—C29 | 120.4 (2) |
O4—C8—O3 | 124.31 (18) | C31—C30—H30 | 119.8 |
O4—C8—C3 | 120.76 (17) | C29—C30—H30 | 119.8 |
O3—C8—C3 | 114.92 (17) | C30—C31—C32 | 118.5 (2) |
O5—C9—C10 | 115.42 (15) | C30—C31—H31 | 120.7 |
O5—C9—H9B | 108.4 | C32—C31—H31 | 120.7 |
C10—C9—H9B | 108.4 | N4—C32—C31 | 123.3 (2) |
O5—C9—H9A | 108.4 | N4—C32—H32 | 118.4 |
C10—C9—H9A | 108.4 | C31—C32—H32 | 118.4 |
H9B—C9—H9A | 107.5 | N4—C33—C29 | 121.9 (2) |
O7—C10—O6 | 126.36 (18) | N4—C33—C34 | 118.19 (17) |
O7—C10—C9 | 114.52 (17) | C29—C33—C34 | 119.88 (19) |
O6—C10—C9 | 119.11 (16) | N3—C34—C26 | 122.6 (2) |
N1—C11—C12 | 122.6 (3) | N3—C34—C33 | 118.18 (17) |
N1—C11—H11 | 118.7 | C26—C34—C33 | 119.2 (2) |
O1W—Mn—O6—C10 | −30.45 (16) | Mn—N1—C11—C12 | −177.58 (19) |
N1—Mn—O6—C10 | −125.37 (16) | N1—C11—C12—C13 | 1.6 (4) |
N4—Mn—O6—C10 | 65.59 (16) | C11—C12—C13—C14 | −2.4 (4) |
N2—Mn—O6—C10 | 161.82 (16) | C12—C13—C14—C22 | 2.0 (4) |
N3—Mn—O6—C10 | 24.6 (5) | C12—C13—C14—C15 | −179.5 (3) |
O6—Mn—N1—C11 | 95.28 (18) | C13—C14—C15—C16 | −177.5 (3) |
O1W—Mn—N1—C11 | 7.02 (18) | C22—C14—C15—C16 | 1.0 (4) |
N4—Mn—N1—C11 | −116.2 (2) | C14—C15—C16—C17 | 0.1 (5) |
N2—Mn—N1—C11 | 178.30 (19) | C15—C16—C17—C18 | 177.2 (3) |
N3—Mn—N1—C11 | −80.42 (18) | C15—C16—C17—C21 | −1.1 (4) |
O6—Mn—N1—C22 | −82.22 (14) | C21—C17—C18—C19 | 0.6 (4) |
O1W—Mn—N1—C22 | −170.48 (14) | C16—C17—C18—C19 | −177.7 (3) |
N4—Mn—N1—C22 | 66.4 (2) | C17—C18—C19—C20 | −1.1 (4) |
N2—Mn—N1—C22 | 0.80 (13) | C21—N2—C20—C19 | 1.1 (3) |
N3—Mn—N1—C22 | 102.08 (14) | Mn—N2—C20—C19 | 176.39 (17) |
O6—Mn—N2—C20 | −77.02 (17) | C18—C19—C20—N2 | 0.3 (4) |
O1W—Mn—N2—C20 | −137.9 (2) | C20—N2—C21—C17 | −1.7 (3) |
N1—Mn—N2—C20 | −176.26 (18) | Mn—N2—C21—C17 | −177.57 (15) |
N4—Mn—N2—C20 | 22.95 (18) | C20—N2—C21—C22 | 176.70 (18) |
N3—Mn—N2—C20 | 97.06 (17) | Mn—N2—C21—C22 | 0.8 (2) |
O6—Mn—N2—C21 | 98.38 (14) | C18—C17—C21—N2 | 0.9 (3) |
O1W—Mn—N2—C21 | 37.5 (3) | C16—C17—C21—N2 | 179.3 (2) |
N1—Mn—N2—C21 | −0.86 (13) | C18—C17—C21—C22 | −177.5 (2) |
N4—Mn—N2—C21 | −161.65 (13) | C16—C17—C21—C22 | 0.9 (3) |
N3—Mn—N2—C21 | −87.54 (14) | C11—N1—C22—C14 | −0.3 (3) |
O6—Mn—N3—C23 | −140.2 (3) | Mn—N1—C22—C14 | 177.38 (16) |
O1W—Mn—N3—C23 | −85.23 (17) | C11—N1—C22—C21 | −178.37 (19) |
N1—Mn—N3—C23 | 9.97 (18) | Mn—N1—C22—C21 | −0.7 (2) |
N4—Mn—N3—C23 | 177.33 (18) | C13—C14—C22—N1 | −0.6 (3) |
N2—Mn—N3—C23 | 83.28 (18) | C15—C14—C22—N1 | −179.2 (2) |
O6—Mn—N3—C34 | 32.1 (5) | C13—C14—C22—C21 | 177.5 (2) |
O1W—Mn—N3—C34 | 87.11 (14) | C15—C14—C22—C21 | −1.2 (3) |
N1—Mn—N3—C34 | −177.68 (14) | N2—C21—C22—N1 | −0.1 (3) |
N4—Mn—N3—C34 | −10.33 (13) | C17—C21—C22—N1 | 178.33 (18) |
N2—Mn—N3—C34 | −104.37 (13) | N2—C21—C22—C14 | −178.22 (19) |
O6—Mn—N4—C32 | 9.20 (17) | C17—C21—C22—C14 | 0.2 (3) |
O1W—Mn—N4—C32 | 97.91 (16) | C34—N3—C23—C24 | 1.6 (3) |
N1—Mn—N4—C32 | −139.10 (19) | Mn—N3—C23—C24 | 173.73 (17) |
N2—Mn—N4—C32 | −77.47 (17) | N3—C23—C24—C25 | −2.9 (4) |
N3—Mn—N4—C32 | −176.69 (17) | C23—C24—C25—C26 | 1.3 (4) |
O6—Mn—N4—C33 | −163.56 (12) | C24—C25—C26—C34 | 1.4 (3) |
O1W—Mn—N4—C33 | −74.85 (13) | C24—C25—C26—C27 | −179.6 (2) |
N1—Mn—N4—C33 | 48.1 (2) | C25—C26—C27—C28 | −176.5 (2) |
N2—Mn—N4—C33 | 109.77 (13) | C34—C26—C27—C28 | 2.4 (3) |
N3—Mn—N4—C33 | 10.55 (12) | C26—C27—C28—C29 | 0.9 (4) |
C6—C1—C2—C3 | −0.4 (3) | C27—C28—C29—C30 | 175.1 (2) |
C7—C1—C2—C3 | 179.47 (17) | C27—C28—C29—C33 | −3.7 (3) |
C1—C2—C3—C4 | 1.0 (3) | C33—C29—C30—C31 | −1.4 (3) |
C1—C2—C3—C8 | −179.91 (17) | C28—C29—C30—C31 | 179.8 (2) |
C2—C3—C4—C5 | 0.1 (3) | C29—C30—C31—C32 | −1.0 (3) |
C8—C3—C4—C5 | −179.02 (17) | C33—N4—C32—C31 | −0.7 (3) |
C9—O5—C5—C4 | −175.88 (15) | Mn—N4—C32—C31 | −173.26 (15) |
C9—O5—C5—C6 | 5.5 (3) | C30—C31—C32—N4 | 2.2 (3) |
C3—C4—C5—O5 | 179.48 (16) | C32—N4—C33—C29 | −1.9 (3) |
C3—C4—C5—C6 | −1.8 (3) | Mn—N4—C33—C29 | 171.52 (14) |
O5—C5—C6—C1 | −178.99 (17) | C32—N4—C33—C34 | 176.75 (17) |
C4—C5—C6—C1 | 2.4 (3) | Mn—N4—C33—C34 | −9.8 (2) |
C2—C1—C6—C5 | −1.3 (3) | C30—C29—C33—N4 | 2.9 (3) |
C7—C1—C6—C5 | 178.81 (17) | C28—C29—C33—N4 | −178.20 (18) |
C2—C1—C7—O2 | 8.0 (3) | C30—C29—C33—C34 | −175.71 (18) |
C6—C1—C7—O2 | −172.1 (2) | C28—C29—C33—C34 | 3.2 (3) |
C2—C1—C7—O1 | −172.33 (18) | C23—N3—C34—C26 | 1.3 (3) |
C6—C1—C7—O1 | 7.5 (3) | Mn—N3—C34—C26 | −171.89 (15) |
C4—C3—C8—O4 | −170.49 (19) | C23—N3—C34—C33 | −177.67 (18) |
C2—C3—C8—O4 | 10.4 (3) | Mn—N3—C34—C33 | 9.2 (2) |
C4—C3—C8—O3 | 10.3 (3) | C25—C26—C34—N3 | −2.7 (3) |
C2—C3—C8—O3 | −168.75 (19) | C27—C26—C34—N3 | 178.23 (19) |
C5—O5—C9—C10 | 69.0 (2) | C25—C26—C34—C33 | 176.20 (18) |
Mn—O6—C10—O7 | 0.6 (3) | C27—C26—C34—C33 | −2.8 (3) |
Mn—O6—C10—C9 | −179.20 (12) | N4—C33—C34—N3 | 0.3 (3) |
O5—C9—C10—O7 | −175.65 (18) | C29—C33—C34—N3 | 178.99 (17) |
O5—C9—C10—O6 | 4.2 (3) | N4—C33—C34—C26 | −178.66 (17) |
C22—N1—C11—C12 | −0.2 (3) | C29—C33—C34—C26 | 0.0 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1W—H1WA···O4i | 0.83 (2) | 1.92 (2) | 2.740 (2) | 174 (2) |
O1—H···O3ii | 0.87 (2) | 1.56 (2) | 2.4148 (19) | 169 (3) |
O2W—H2WB···O4iii | 0.84 (2) | 2.08 (2) | 2.917 (2) | 176 (3) |
O2W—H2WA···O2iv | 0.83 (2) | 2.08 (2) | 2.908 (3) | 177 (3) |
O3W—H3WB···O3v | 0.83 (2) | 2.55 (2) | 3.323 (3) | 155 (4) |
O3W—H3WA···O2Wvi | 0.84 (2) | 2.01 (2) | 2.845 (3) | 173 (5) |
Symmetry codes: (i) −x+1/2, y+1/2, −z+1/2; (ii) x−1/2, −y+1/2, z−1/2; (iii) −x+1/2, y+1/2, −z+3/2; (iv) −x, −y+1, −z+1; (v) −x+1, −y+1, −z+1; (vi) x−1/2, −y+3/2, z−1/2. |
Experimental details
Crystal data | |
Chemical formula | [Mn(C10H6O7)(C12H8N2)2(H2O)]·2H2O |
Mr | 707.54 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 296 |
a, b, c (Å) | 8.1024 (2), 22.3106 (6), 17.5381 (5) |
β (°) | 99.212 (2) |
V (Å3) | 3129.46 (14) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.49 |
Crystal size (mm) | 0.29 × 0.24 × 0.10 |
Data collection | |
Diffractometer | Bruker APEXII CCD |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.871, 0.955 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 69826, 7282, 5127 |
Rint | 0.050 |
(sin θ/λ)max (Å−1) | 0.654 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.038, 0.117, 1.00 |
No. of reflections | 7282 |
No. of parameters | 463 |
No. of restraints | 10 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.41, −0.26 |
Computer programs: APEX2 (Bruker, 2006), SAINT (Bruker, 2006), SHELXS97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2007), SHELXTL (Sheldrick, 2008).
Mn—O6 | 2.1352 (13) | Mn—N4 | 2.2633 (16) |
Mn—O1W | 2.1820 (15) | Mn—N2 | 2.2776 (16) |
Mn—N1 | 2.2462 (17) | Mn—N3 | 2.2974 (16) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1W—H1WA···O4i | 0.829 (15) | 1.915 (16) | 2.740 (2) | 174 (2) |
O1—H···O3ii | 0.867 (16) | 1.559 (17) | 2.4148 (19) | 169 (3) |
O2W—H2WB···O4iii | 0.838 (16) | 2.080 (17) | 2.917 (2) | 176 (3) |
O2W—H2WA···O2iv | 0.834 (17) | 2.075 (17) | 2.908 (3) | 177 (3) |
O3W—H3WB···O3v | 0.831 (18) | 2.55 (2) | 3.323 (3) | 155 (4) |
O3W—H3WA···O2Wvi | 0.839 (18) | 2.011 (19) | 2.845 (3) | 173 (5) |
Symmetry codes: (i) −x+1/2, y+1/2, −z+1/2; (ii) x−1/2, −y+1/2, z−1/2; (iii) −x+1/2, y+1/2, −z+3/2; (iv) −x, −y+1, −z+1; (v) −x+1, −y+1, −z+1; (vi) x−1/2, −y+3/2, z−1/2. |
References
Brandenburg, K. (2007). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Bruker (2006). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Cao, X.-Y., Zhang, J., Cheng, J.-K., Kang, Y. & Yao, Y.-G. (2004). CrystEngComm, 6, 315–317. Web of Science CSD CrossRef CAS Google Scholar
Cao, X.-Y., Zhang, J., Li, Z.-J., Cheng, J.-K. & Yao, Y.-G. (2007). CrystEngComm, 9, 806–814. Web of Science CSD CrossRef CAS Google Scholar
Cheng, D., Khan, M. A. & Houser, R. P. (2004). Cryst. Growth Des. 4, 599–604. Web of Science CSD CrossRef CAS Google Scholar
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Many aromatic polycarboxylate ligands have been employed as organic skeletons in the formation of various metal-organic compounds. To the best of our knowledge, aromatic polycarboxylate ligand with both rigid and flexible carboxyl groups are less reported. In comparison with rigid aromatic multicarboxylic ligands (Cheng et al., 2004; Murugavel et al., 2002; Zhang et al., 2002), 5-oxyacetic-1,3-benzenebiscarboxylic acid (H3OABDC) provides two rigid carboxyl groups and one flexible oxyacetato group (Cao et al., 2004, 2007). Herein, we report the synthesis and structure of a new MnII compound based on the H3OABDC ligand, [Mn(C10H6O7)(C12H8N2)2(H2O)].2H2O, (I).
Compound (I) consists of one MnII atom, one HOABDC2- dianion, two phenanthroline (phen) ligands, one coordinated and two lattice water molecules, as shown in Fig. 1. The MnII atom is six-coordinated by four nitrogen atoms from two phen ligands (Mn—N 2.2462 (17)–2.2974 (16) Å), one oxygen atom from one flexible carboxyl group of the HOABDC2- anion (Mn—O 2.1352 (13) Å) and one water molecule (Mn—O 2.1820 (15) Å) in a distorted octahedral geometry. It is notable that only the flexible carboxylato group participates in a monodentately coordinating mode to the MnII atom. The dianion is not planar as indicated by the dihedral angles (8.2 (1)–10.17 (5) °) between the benzene ring and the two carboxy groups, as well as the torsion angle (69.0 (2) °) involving the benzene ring and the OCH2COO2 group. The complex molecules are connected to each other through O—H···O interactions between the two rigid carboxyl groups of the HOABDC2- dianion to form a "T"-shaped chain (Fig. 2). Adjacent chains are further linked with each other via weak π–π interactions between phen groups (centroid—centroid separation between planes is 4.2932 (1) Å) and O—H···O hydrogen bonds involving both coordinated and uncoordinated water molecules (Fig. 3).