metal-organic compounds
Hexaaquamanganese(II) bis{[N-(3-methoxy-2-oxidobenzylidene)glycylglycinato]copper(II)} hexahydrate
aChemistry Department, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
*Correspondence e-mail: zouyang@zstu.edu.cn
The ligand N-(2-hydroxy-3-methoxybenzylidene)glycylglycine (H3L), a Schiff base derived from glycylglycine and 3-methoxysalicylaldehyde, was used in the synthesis of a new organic–inorganic coordination complex, [Mn(H2O)6][Cu(C12H11N2O5)]2·6H2O. The MnII atom is located on an inversion center and is coordinated to six water molecules in a slightly distorted octahedral geometry. The CuII atom is chelated by the tetradentate Schiff base ligand in a distorted CuN2O2 square-planar coordination. In the the complex [Mn(H2O)6]2+ cations and the [CuL]− anions are arranged in columns parallel to the a axis and are held together by O—H⋯O hydrogen bonding. Additional hydrogen bonds of the same type further link the columns into a three-dimensional network.
Related literature
Transition metal complexes of salicylaldehyde–peptide- and salicylaldehyde–amino-acid-derived et al. (1988); Wetmore et al. (2001); Zabinski & Toney (2001). For the preparation, structural characterization, spectroscopic and magnetic studies of Schiff base complexes derived from salicylaldehyde and amino acids, see: Ganguly et al. (2008) and references cited therein. For derived from simple see: Zou et al. (2003).
are suitable non-enzymatic models for pyridoxal amino acid systems, which are of considerable importance as key intermediates in metabolic reactions, see: Bkouche-WaksmanExperimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 2003); cell SAINT (Bruker, 2003); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2000); software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536810013061/wm2319sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810013061/wm2319Isup2.hkl
The Schiff base was prepared through the condensation of glycylglycine and 3-methoxy-salicylaldehyde. Glycylglycine (10 mmol) was dissolved and refluxed in absolute methanol (40 ml) containing LiOH.H2O (10 mmol). After cooling to room temperature, a solution of 3-methoxy-salicylaldehyde (10 mmol) in absolute methanol was added slowly under stirring for 10 min. Then Cu(NO3)2 (10 mmol) was added to the HLLi solution and the resulting solution was adjusted to pH = 9-11 by 1.0 mol/L NaOH solution. After stirring at room temperature for 30 min, the volume was reduced to ca. 5 ml in vacuo. Anhydrous ethanol was added to precipitate the product, which then was recrystallized in methanol solution. Na[CuL].2H2O (2 mmol) was dissolved in 10 ml water. Then MnCl2.4H2O (1 mmol) was added to the solution under stirring. The resulting crude product was precipitated. It was recrystallized in hot water 363 K and filtered. The filtrate was allowed to evaporate slowly at room temperature. After several days red to violet crystals suitable for X-ray diffraction were obtained.
The water H atoms in the complex were located in a difference Fourier map and were refined with a distance restraint of O—H = 0.85 Å and Uiso(H) = 1.5Ueq(O). All other H atoms were positioned geometrically and were constrained as riding atoms, with C—H distances of 0.93–0.97 Å and Uiso(H) set to 1.2 or 1.5Ueq(C) of the parent atom.
Transition metal complexes of salicylaldehyde-peptides and salicylaldehyde-amino acid Schiff-bases are non-enzymatic models for pyridoxal-amino acid systems, which are of considerable importance as key intermediates in many metabolic reactions of amino acids catalyzed by enzymes (Zabinski et al., 2001; Wetmore et al., 2001; Bkouche-Waksman et al.,1988). Considerable effort has been devoted to the preparation, structural characterization, appropriate spectroscopic and magnetic studies of Schiff-base complexes derived from salicylaldehyde and amino acids and reduced salicylidene amino acids (Ganguly et al., 2008), but little attention has been devoted to
derived from simple (Zou et al., 2003). Herein, we report the structure study of [Mn(H2O)6][Cu(C12H11N2O5)]2.6H2O (H3L= Schiff base derived from glycylglycine and 3-methoxy-salicylaldehyde, C12H14N2O5).The
of structure (I) consist of one-half of a [Mn(H2O)6]2+ cation (completed by crystallographic inversion symmetry), one [CuL]- anion and three water molecules (Fig. 1 and Table 1). The coordination environment of the CuII atoms is approximately square-planar. The Schiff-base ligand is deprotonated, thus acting as a triple negatively charged tetradentate ONNO chelate. It coordinates to the CuII atom via one phenolic oxygen atom (O2), one deprotonated amide nitrogen atom (N2), one imino nitrogen atom (N1) and one carboxylate oxygen atom (O4). The two Cu—N bond distances are 1.905 (5) Å (Cu1—N1) and 1.887 (5) Å (Cu1—N2). The two Cu—O bonds are 1.979 (4) (Cu1—O4) and 1.873 (4) Å (Cu1—O2). The phenyl ring [C1—C6] and the chelate ring [C1, C6, C7, N1, O2, Cu1] are almost coplanar with a small dihedral angle of 0.6°. The MnII center is octahedrally coordinated by the O atoms of six water molecules with Mn—O bond lengths in the range of 2.161 (4)-2.212 (4) Å.Complex (I) shows an interesting stacking structure. The anions and cations of the complex form well-separated columns (Fig. 2) stacked along [100], held together by hydrogen bonding of the type O—H···O. The anion stacking is characterised by [CuL]- columns arranged in a zig-zag manner. The shortest Cu···Cu separation within a [CuL]- chain is 4.447 Å and the closest Cu···Cu separation between anionic chains is 9.312 Å. Additional O—H···O hydrogen bonds between the coordinated water molecules and uncoordinated water molecules further link the columns into a three-dimension network (Fig. 2, Table 1).
Transition metal complexes of salicylaldehyde-peptide and salicylaldehyde–amino acid derived
are suitable non-enzymatic models for pyridoxal amino acid systems, which are of considerable importance as key intermediates in many metabolic reactions; see: Bkouche-Waksman et al. (1988); Wetmore et al. (2001); Zabinski & Toney (2001). For the preparation, structural characterization, spectroscopic and magnetic studies of Schiff base complexes derived from salicylaldehyde and amino acids, see: Ganguly et al. (2008) and references cited therein. For derived from simple see: Zou et al. (2003).Data collection: SMART (Bruker, 2003); cell
SAINT (Bruker, 2003); data reduction: SAINT (Bruker, 2003); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2000); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. ORTEP plot of the asymmetric unit of complex (I) with the atom-numbering scheme (ellipsoids are drawn at the 40% probability level). | |
Fig. 2. Representation of the hydrogen-bonded three-dimensional network (dashed lines) in the crystal structure of compound (I). |
[Mn(H2O)6][Cu(C12H11N2O5)]2·6H2O | Z = 1 |
Mr = 924.67 | F(000) = 477 |
Triclinic, P1 | Dx = 1.682 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 6.712 (1) Å | Cell parameters from 1625 reflections |
b = 11.762 (2) Å | θ = 1.7–25.0° |
c = 12.092 (2) Å | µ = 1.59 mm−1 |
α = 76.51 (1)° | T = 293 K |
β = 83.90 (1)° | Block, violet-red |
γ = 80.37 (1)° | 0.3 × 0.2 × 0.2 mm |
V = 912.9 (3) Å3 |
Bruker SMART CCD diffractometer | 3156 independent reflections |
Radiation source: fine-focus sealed tube | 1625 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.114 |
φ and ω scans | θmax = 25.0°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Bruker, 2003) | h = −7→7 |
Tmin = 0.690, Tmax = 0.728 | k = −12→13 |
4571 measured reflections | l = −14→13 |
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)] = 0.057 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.129 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.79 | w = 1/[σ2(Fo2) + (0.0082P)2] where P = (Fo2 + 2Fc2)/3 |
3156 reflections | (Δ/σ)max < 0.001 |
246 parameters | Δρmax = 0.74 e Å−3 |
114 restraints | Δρmin = −0.56 e Å−3 |
[Mn(H2O)6][Cu(C12H11N2O5)]2·6H2O | γ = 80.37 (1)° |
Mr = 924.67 | V = 912.9 (3) Å3 |
Triclinic, P1 | Z = 1 |
a = 6.712 (1) Å | Mo Kα radiation |
b = 11.762 (2) Å | µ = 1.59 mm−1 |
c = 12.092 (2) Å | T = 293 K |
α = 76.51 (1)° | 0.3 × 0.2 × 0.2 mm |
β = 83.90 (1)° |
Bruker SMART CCD diffractometer | 3156 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2003) | 1625 reflections with I > 2σ(I) |
Tmin = 0.690, Tmax = 0.728 | Rint = 0.114 |
4571 measured reflections |
R[F2 > 2σ(F2)] = 0.057 | 114 restraints |
wR(F2) = 0.129 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.79 | Δρmax = 0.74 e Å−3 |
3156 reflections | Δρmin = −0.56 e Å−3 |
246 parameters |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 | ||
Cu1 | 0.77185 (12) | 0.49742 (7) | 0.37778 (7) | 0.0309 (3) | |
C1 | 0.7114 (9) | 0.5700 (6) | 0.5897 (5) | 0.0359 (10) | |
C2 | 0.6755 (9) | 0.6598 (7) | 0.6508 (6) | 0.0396 (11) | |
C3 | 0.6653 (9) | 0.6330 (7) | 0.7685 (6) | 0.0407 (12) | |
H3 | 0.6421 | 0.6942 | 0.8071 | 0.049* | |
C4 | 0.6886 (9) | 0.5174 (6) | 0.8304 (6) | 0.0441 (13) | |
H4 | 0.6799 | 0.5007 | 0.9097 | 0.053* | |
C5 | 0.7244 (9) | 0.4286 (7) | 0.7730 (6) | 0.0430 (13) | |
H5 | 0.7406 | 0.3507 | 0.8143 | 0.052* | |
C6 | 0.7379 (9) | 0.4509 (6) | 0.6520 (5) | 0.0365 (11) | |
C7 | 0.7766 (9) | 0.3506 (6) | 0.6003 (5) | 0.0366 (12) | |
H7 | 0.7891 | 0.2761 | 0.6487 | 0.044* | |
C8 | 0.8340 (9) | 0.2463 (5) | 0.4483 (5) | 0.0332 (12) | |
H8A | 0.7253 | 0.1997 | 0.4758 | 0.040* | |
H8B | 0.9599 | 0.1992 | 0.4746 | 0.040* | |
C9 | 0.8469 (9) | 0.2797 (6) | 0.3194 (5) | 0.0311 (11) | |
C10 | 0.8264 (9) | 0.4476 (5) | 0.1580 (5) | 0.0283 (11) | |
H10A | 0.7242 | 0.4223 | 0.1221 | 0.034* | |
H10B | 0.9579 | 0.4245 | 0.1214 | 0.034* | |
C11 | 0.7866 (9) | 0.5805 (6) | 0.1443 (5) | 0.0296 (11) | |
C12 | 0.6232 (10) | 0.8684 (6) | 0.6400 (6) | 0.0542 (19) | |
H12A | 0.4973 | 0.8690 | 0.6857 | 0.081* | |
H12B | 0.6206 | 0.9412 | 0.5837 | 0.081* | |
H12C | 0.7325 | 0.8602 | 0.6878 | 0.081* | |
N1 | 0.7953 (7) | 0.3554 (5) | 0.4929 (4) | 0.0317 (10) | |
N2 | 0.8214 (7) | 0.3923 (4) | 0.2782 (4) | 0.0285 (10) | |
O1 | 0.6519 (6) | 0.7718 (4) | 0.5847 (4) | 0.0457 (11) | |
O2 | 0.7206 (6) | 0.6012 (4) | 0.4771 (4) | 0.0378 (10) | |
O3 | 0.8774 (6) | 0.1989 (4) | 0.2649 (4) | 0.0394 (12) | |
O4 | 0.7585 (6) | 0.6211 (3) | 0.2352 (3) | 0.0315 (10) | |
O5 | 0.7834 (6) | 0.6436 (4) | 0.0469 (4) | 0.0384 (11) | |
Mn1 | 0.5000 | 0.0000 | 0.0000 | 0.0327 (4) | |
O6 | 0.1953 (6) | 0.0535 (4) | −0.0541 (4) | 0.0428 (13) | |
H6C | 0.1523 | 0.0503 | 0.0151 | 0.051* | |
H6B | 0.1485 | 0.1267 | −0.0706 | 0.051* | |
O7 | 0.5193 (6) | 0.1775 (4) | 0.0174 (4) | 0.0477 (13) | |
H7B | 0.4022 | 0.2108 | 0.0358 | 0.057* | |
H7C | 0.5945 | 0.1606 | 0.0730 | 0.057* | |
O8 | 0.3774 (6) | −0.0518 (4) | 0.1787 (4) | 0.0572 (15) | |
H8D | 0.4634 | −0.0446 | 0.2224 | 0.069* | |
H8E | 0.2674 | −0.0066 | 0.1889 | 0.069* | |
O9 | 0.9213 (6) | 0.2144 (4) | 0.0353 (4) | 0.0465 (13) | |
H9D | 0.9092 | 0.2092 | 0.1070 | 0.056* | |
H9B | 0.8259 | 0.2617 | 0.0008 | 0.056* | |
O10 | 0.6740 (7) | 0.8222 (4) | 0.3246 (4) | 0.0500 (14) | |
H10F | 0.6994 | 0.7607 | 0.2971 | 0.060* | |
O11A | 0.0288 (7) | 0.0311 (4) | 0.7410 (4) | 0.0554 (15) | |
H11B | 0.1159 | 0.0700 | 0.7544 | 0.066* | |
H11C | 0.0589 | −0.0354 | 0.7454 | 0.066* | |
H10E | 0.662 (10) | 0.759 (6) | 0.387 (6) | 0.06 (2)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cu1 | 0.0346 (5) | 0.0328 (5) | 0.0247 (5) | −0.0031 (4) | −0.0013 (4) | −0.0065 (4) |
C1 | 0.0277 (19) | 0.054 (2) | 0.029 (2) | −0.0056 (18) | −0.0004 (18) | −0.0161 (19) |
C2 | 0.029 (2) | 0.057 (2) | 0.036 (2) | −0.005 (2) | −0.0012 (19) | −0.020 (2) |
C3 | 0.029 (2) | 0.063 (3) | 0.034 (2) | −0.005 (2) | −0.001 (2) | −0.022 (2) |
C4 | 0.031 (2) | 0.069 (3) | 0.034 (2) | −0.007 (2) | 0.000 (2) | −0.017 (2) |
C5 | 0.031 (2) | 0.066 (3) | 0.032 (2) | −0.007 (2) | 0.001 (2) | −0.011 (2) |
C6 | 0.028 (2) | 0.055 (2) | 0.028 (2) | −0.0085 (19) | −0.0002 (18) | −0.0124 (19) |
C7 | 0.030 (2) | 0.050 (2) | 0.030 (2) | −0.009 (2) | 0.000 (2) | −0.006 (2) |
C8 | 0.029 (2) | 0.039 (2) | 0.031 (2) | −0.006 (2) | −0.002 (2) | −0.005 (2) |
C9 | 0.027 (2) | 0.035 (2) | 0.031 (2) | −0.006 (2) | −0.0011 (19) | −0.004 (2) |
C10 | 0.024 (2) | 0.032 (2) | 0.027 (2) | −0.003 (2) | 0.000 (2) | −0.005 (2) |
C11 | 0.025 (2) | 0.032 (2) | 0.029 (2) | −0.002 (2) | 0.0010 (19) | −0.0042 (19) |
C12 | 0.053 (4) | 0.061 (4) | 0.058 (4) | −0.006 (3) | −0.004 (3) | −0.033 (4) |
N1 | 0.028 (2) | 0.041 (2) | 0.027 (2) | −0.0088 (19) | −0.0008 (19) | −0.009 (2) |
N2 | 0.024 (2) | 0.031 (2) | 0.029 (2) | −0.0047 (19) | −0.0009 (18) | −0.0025 (19) |
O1 | 0.041 (2) | 0.058 (3) | 0.044 (2) | −0.005 (2) | −0.0023 (19) | −0.024 (2) |
O2 | 0.035 (2) | 0.050 (2) | 0.030 (2) | −0.0042 (19) | −0.0017 (19) | −0.013 (2) |
O3 | 0.046 (3) | 0.035 (3) | 0.036 (3) | −0.001 (2) | −0.001 (2) | −0.010 (2) |
O4 | 0.034 (2) | 0.030 (2) | 0.029 (2) | −0.0028 (18) | 0.0010 (18) | −0.0058 (18) |
O5 | 0.039 (3) | 0.039 (3) | 0.031 (2) | 0.000 (2) | 0.000 (2) | −0.001 (2) |
Mn1 | 0.0291 (9) | 0.0317 (9) | 0.0351 (9) | −0.0001 (7) | −0.0035 (7) | −0.0055 (7) |
O6 | 0.029 (3) | 0.052 (3) | 0.047 (3) | 0.005 (2) | −0.007 (2) | −0.016 (3) |
O7 | 0.042 (3) | 0.038 (3) | 0.061 (3) | 0.007 (2) | −0.016 (2) | −0.011 (3) |
O8 | 0.036 (3) | 0.084 (4) | 0.041 (3) | 0.004 (3) | −0.001 (2) | −0.001 (3) |
O9 | 0.051 (3) | 0.048 (3) | 0.039 (3) | 0.006 (2) | −0.011 (2) | −0.013 (3) |
O10 | 0.064 (4) | 0.034 (3) | 0.052 (4) | −0.011 (3) | −0.006 (3) | −0.008 (3) |
O11A | 0.050 (3) | 0.043 (3) | 0.074 (4) | −0.010 (2) | 0.003 (3) | −0.016 (3) |
Cu1—O2 | 1.873 (4) | C10—H10A | 0.9700 |
Cu1—N2 | 1.887 (5) | C10—H10B | 0.9700 |
Cu1—N1 | 1.905 (5) | C11—O5 | 1.237 (7) |
Cu1—O4 | 1.979 (4) | C11—O4 | 1.282 (7) |
C1—O2 | 1.323 (7) | C12—O1 | 1.424 (7) |
C1—C2 | 1.400 (8) | C12—H12A | 0.9600 |
C1—C6 | 1.418 (9) | C12—H12B | 0.9600 |
C2—O1 | 1.366 (8) | C12—H12C | 0.9600 |
C2—C3 | 1.382 (9) | Mn1—O6i | 2.161 (4) |
C3—C4 | 1.383 (9) | Mn1—O6 | 2.161 (4) |
C3—H3 | 0.9300 | Mn1—O7i | 2.173 (4) |
C4—C5 | 1.360 (8) | Mn1—O7 | 2.173 (4) |
C4—H4 | 0.9300 | Mn1—O8i | 2.212 (4) |
C5—C6 | 1.421 (9) | Mn1—O8 | 2.212 (4) |
C5—H5 | 0.9300 | O6—H6C | 0.8500 |
C6—C7 | 1.434 (8) | O6—H6B | 0.8500 |
C7—N1 | 1.280 (7) | O7—H7B | 0.8500 |
C7—H7 | 0.9300 | O7—H7C | 0.8499 |
C8—N1 | 1.479 (7) | O8—H8D | 0.8499 |
C8—C9 | 1.513 (8) | O8—H8E | 0.8499 |
C8—H8A | 0.9700 | O9—H9D | 0.8500 |
C8—H8B | 0.9700 | O9—H9B | 0.8500 |
C9—O3 | 1.256 (7) | O10—H10F | 0.8500 |
C9—N2 | 1.290 (7) | O10—H10E | 0.93 (7) |
C10—N2 | 1.447 (7) | O11A—H11B | 0.8495 |
C10—C11 | 1.513 (8) | O11A—H11C | 0.7651 |
O2—Cu1—N2 | 179.5 (2) | O4—C11—C10 | 117.6 (6) |
O2—Cu1—N1 | 96.4 (2) | O1—C12—H12A | 109.5 |
N2—Cu1—N1 | 83.4 (2) | O1—C12—H12B | 109.5 |
O2—Cu1—O4 | 96.16 (18) | H12A—C12—H12B | 109.5 |
N2—Cu1—O4 | 84.08 (19) | O1—C12—H12C | 109.5 |
N1—Cu1—O4 | 167.49 (18) | H12A—C12—H12C | 109.5 |
O2—C1—C2 | 118.0 (6) | H12B—C12—H12C | 109.5 |
O2—C1—C6 | 123.8 (6) | C7—N1—C8 | 121.0 (6) |
C2—C1—C6 | 118.2 (6) | C7—N1—Cu1 | 124.9 (5) |
O1—C2—C3 | 124.6 (6) | C8—N1—Cu1 | 114.1 (4) |
O1—C2—C1 | 114.6 (6) | C9—N2—C10 | 124.9 (5) |
C3—C2—C1 | 120.7 (7) | C9—N2—Cu1 | 119.8 (5) |
C2—C3—C4 | 121.7 (7) | C10—N2—Cu1 | 115.3 (4) |
C2—C3—H3 | 119.2 | C2—O1—C12 | 118.2 (5) |
C4—C3—H3 | 119.2 | C1—O2—Cu1 | 125.7 (4) |
C5—C4—C3 | 118.6 (7) | C11—O4—Cu1 | 114.0 (4) |
C5—C4—H4 | 120.7 | O6i—Mn1—O6 | 180.0 (4) |
C3—C4—H4 | 120.7 | O6i—Mn1—O7i | 91.61 (16) |
C4—C5—C6 | 122.1 (7) | O6—Mn1—O7i | 88.39 (16) |
C4—C5—H5 | 118.9 | O6i—Mn1—O7 | 88.39 (16) |
C6—C5—H5 | 118.9 | O6—Mn1—O7 | 91.61 (16) |
C1—C6—C5 | 118.6 (6) | O7i—Mn1—O7 | 180.0 (2) |
C1—C6—C7 | 124.0 (6) | O6i—Mn1—O8i | 89.94 (16) |
C5—C6—C7 | 117.4 (6) | O6—Mn1—O8i | 90.06 (16) |
N1—C7—C6 | 125.3 (7) | O7i—Mn1—O8i | 92.27 (17) |
N1—C7—H7 | 117.4 | O7—Mn1—O8i | 87.73 (17) |
C6—C7—H7 | 117.4 | O6i—Mn1—O8 | 90.06 (16) |
N1—C8—C9 | 109.0 (5) | O6—Mn1—O8 | 89.94 (16) |
N1—C8—H8A | 109.9 | O7i—Mn1—O8 | 87.73 (17) |
C9—C8—H8A | 109.9 | O7—Mn1—O8 | 92.27 (17) |
N1—C8—H8B | 109.9 | O8i—Mn1—O8 | 180.0 (4) |
C9—C8—H8B | 109.9 | Mn1—O6—H6C | 89.0 |
H8A—C8—H8B | 108.3 | Mn1—O6—H6B | 119.0 |
O3—C9—N2 | 127.5 (6) | H6C—O6—H6B | 90.0 |
O3—C9—C8 | 118.8 (5) | Mn1—O7—H7B | 109.3 |
N2—C9—C8 | 113.7 (6) | Mn1—O7—H7C | 99.5 |
N2—C10—C11 | 109.1 (5) | H7B—O7—H7C | 110.9 |
N2—C10—H10A | 109.9 | Mn1—O8—H8D | 108.6 |
C11—C10—H10A | 109.9 | Mn1—O8—H8E | 109.3 |
N2—C10—H10B | 109.9 | H8D—O8—H8E | 109.5 |
C11—C10—H10B | 109.9 | H9D—O9—H9B | 112.9 |
H10A—C10—H10B | 108.3 | H10F—O10—H10E | 74.7 |
O5—C11—O4 | 123.7 (6) | H11B—O11A—H11C | 118.5 |
O5—C11—C10 | 118.7 (5) |
Symmetry code: (i) −x+1, −y, −z. |
D—H···A | D—H | H···A | D···A | D—H···A |
O11A—H11C···O3ii | 0.77 | 1.93 | 2.689 (6) | 172 |
O11A—H11B···O10iii | 0.85 | 2.06 | 2.786 (7) | 143 |
O10—H10F···O4 | 0.85 | 1.93 | 2.775 (6) | 180 |
O10—H10E···O2 | 0.93 (7) | 1.92 (7) | 2.805 (7) | 157 (6) |
O9—H9D···O3 | 0.85 | 1.88 | 2.727 (6) | 179 |
O9—H9B···O7 | 0.85 | 2.40 | 2.842 (6) | 113 |
O8—H8E···O11Aiv | 0.85 | 2.12 | 2.786 (6) | 135 |
O8—H8D···O10v | 0.85 | 2.17 | 2.795 (7) | 130 |
O7—H7C···O9 | 0.85 | 2.35 | 2.842 (6) | 117 |
O7—H7B···O5vi | 0.85 | 2.06 | 2.702 (6) | 132 |
O6—H6B···O9vii | 0.85 | 2.17 | 2.739 (5) | 124 |
Symmetry codes: (ii) −x+1, −y, −z+1; (iii) −x+1, −y+1, −z+1; (iv) −x, −y, −z+1; (v) x, y−1, z; (vi) −x+1, −y+1, −z; (vii) x−1, y, z. |
Experimental details
Crystal data | |
Chemical formula | [Mn(H2O)6][Cu(C12H11N2O5)]2·6H2O |
Mr | 924.67 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 293 |
a, b, c (Å) | 6.712 (1), 11.762 (2), 12.092 (2) |
α, β, γ (°) | 76.51 (1), 83.90 (1), 80.37 (1) |
V (Å3) | 912.9 (3) |
Z | 1 |
Radiation type | Mo Kα |
µ (mm−1) | 1.59 |
Crystal size (mm) | 0.3 × 0.2 × 0.2 |
Data collection | |
Diffractometer | Bruker SMART CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2003) |
Tmin, Tmax | 0.690, 0.728 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4571, 3156, 1625 |
Rint | 0.114 |
(sin θ/λ)max (Å−1) | 0.594 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.057, 0.129, 0.79 |
No. of reflections | 3156 |
No. of parameters | 246 |
No. of restraints | 114 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.74, −0.56 |
Computer programs: SMART (Bruker, 2003), SAINT (Bruker, 2003), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), XP in SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2000), SHELXTL (Sheldrick, 2008).
Cu1—O2 | 1.873 (4) | Mn1—O6 | 2.161 (4) |
Cu1—N2 | 1.887 (5) | Mn1—O7 | 2.173 (4) |
Cu1—N1 | 1.905 (5) | Mn1—O8 | 2.212 (4) |
Cu1—O4 | 1.979 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
O11A—H11C···O3i | 0.77 | 1.93 | 2.689 (6) | 172.0 |
O11A—H11B···O10ii | 0.85 | 2.06 | 2.786 (7) | 142.6 |
O10—H10F···O4 | 0.85 | 1.93 | 2.775 (6) | 179.6 |
O10—H10E···O2 | 0.93 (7) | 1.92 (7) | 2.805 (7) | 157 (6) |
O9—H9D···O3 | 0.85 | 1.88 | 2.727 (6) | 178.9 |
O9—H9B···O7 | 0.85 | 2.40 | 2.842 (6) | 113.0 |
O8—H8E···O11Aiii | 0.85 | 2.12 | 2.786 (6) | 135.4 |
O8—H8D···O10iv | 0.85 | 2.17 | 2.795 (7) | 130.3 |
O7—H7C···O9 | 0.85 | 2.35 | 2.842 (6) | 117.0 |
O7—H7B···O5v | 0.85 | 2.06 | 2.702 (6) | 132.1 |
O6—H6B···O9vi | 0.85 | 2.17 | 2.739 (5) | 124.3 |
Symmetry codes: (i) −x+1, −y, −z+1; (ii) −x+1, −y+1, −z+1; (iii) −x, −y, −z+1; (iv) x, y−1, z; (v) −x+1, −y+1, −z; (vi) x−1, y, z. |
Acknowledgements
The authors thank the Natural Science Foundation of Zhejiang Province (grant No. Y4080342) and the Science Foundation of Zhejiang Sci-Tech University (grant No. 0813622-Y) for financial support.
References
Bkouche-Waksman, I., Barbe, J. M. & Kvick, Å. (1988). Acta Cryst. B44, 595–601. CSD CrossRef CAS Web of Science IUCr Journals Google Scholar
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Transition metal complexes of salicylaldehyde-peptides and salicylaldehyde-amino acid Schiff-bases are non-enzymatic models for pyridoxal-amino acid systems, which are of considerable importance as key intermediates in many metabolic reactions of amino acids catalyzed by enzymes (Zabinski et al., 2001; Wetmore et al., 2001; Bkouche-Waksman et al.,1988). Considerable effort has been devoted to the preparation, structural characterization, appropriate spectroscopic and magnetic studies of Schiff-base complexes derived from salicylaldehyde and amino acids and reduced salicylidene amino acids (Ganguly et al., 2008), but little attention has been devoted to Schiff bases derived from simple peptides (Zou et al., 2003). Herein, we report the structure study of [Mn(H2O)6][Cu(C12H11N2O5)]2.6H2O (H3L= Schiff base derived from glycylglycine and 3-methoxy-salicylaldehyde, C12H14N2O5).
The asymmetric unit of structure (I) consist of one-half of a [Mn(H2O)6]2+ cation (completed by crystallographic inversion symmetry), one [CuL]- anion and three water molecules (Fig. 1 and Table 1). The coordination environment of the CuII atoms is approximately square-planar. The Schiff-base ligand is deprotonated, thus acting as a triple negatively charged tetradentate ONNO chelate. It coordinates to the CuII atom via one phenolic oxygen atom (O2), one deprotonated amide nitrogen atom (N2), one imino nitrogen atom (N1) and one carboxylate oxygen atom (O4). The two Cu—N bond distances are 1.905 (5) Å (Cu1—N1) and 1.887 (5) Å (Cu1—N2). The two Cu—O bonds are 1.979 (4) (Cu1—O4) and 1.873 (4) Å (Cu1—O2). The phenyl ring [C1—C6] and the chelate ring [C1, C6, C7, N1, O2, Cu1] are almost coplanar with a small dihedral angle of 0.6°. The MnII center is octahedrally coordinated by the O atoms of six water molecules with Mn—O bond lengths in the range of 2.161 (4)-2.212 (4) Å.
Complex (I) shows an interesting stacking structure. The anions and cations of the complex form well-separated columns (Fig. 2) stacked along [100], held together by hydrogen bonding of the type O—H···O. The anion stacking is characterised by [CuL]- columns arranged in a zig-zag manner. The shortest Cu···Cu separation within a [CuL]- chain is 4.447 Å and the closest Cu···Cu separation between anionic chains is 9.312 Å. Additional O—H···O hydrogen bonds between the coordinated water molecules and uncoordinated water molecules further link the columns into a three-dimension network (Fig. 2, Table 1).