Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807022635/bt2363sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807022635/bt2363Isup2.hkl |
CCDC reference: 651435
To a solution of benzaldehyde (1.166 g, 11 mmol) in absolute ethanol (40 ml) a suspension of 2,6-dipicolinoyhydrazine in the same solvent (50 ml) was added at 353 K. The mixture was left to react at reflux for 8 h. Then, the white product was filtered, washed with hot ethanol (20 ml) three times and dried in vacuo. Crystals suitable for X-ray diffraction were obtained from dimethylformamide–methanol (3:1 v/v) over a period of about three weeks.
All H atoms were located in difference maps. H atoms bonded to C were then treated as riding with C—H = 0.93 Å and Uiso(H) = 1.2Ueq(C). The coordinates of the remaining H atoms were refined, but Uiso(H) was set to 1.2Ueq(N,O).
Tridentate ligands containing the 2,6-dipicolinoyhydrazone moiety have been intensively studied due to their interesting coordination mode (Chen et al., 1997; Thompson et al.,2002; Zhao et al., 2004).
The molecules are linked into a three dimensional framework by a combination of N–H···O C—H···O and O—H···O hydrogen bonds.
For related literature, see: Chen et al. (1997); Thompson (2002); Zhao et al. (2004).
Data collection: SMART (Bruker, 2001); cell refinement: SMART-Plus (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: SHELXTL.
Fig. 1. The molecular structure of the title compound with atom labels and 50% probability displacement ellipsoids. Hydrogen bonds are shown as dashed lines. |
C21H17N5O2·H2O | Dx = 1.297 Mg m−3 |
Mr = 389.41 | Mo Kα radiation, λ = 0.71073 Å |
Orthorhombic, Pna21 | Cell parameters from 1982 reflections |
a = 10.3490 (8) Å | θ = 2.5–21.4° |
b = 16.2487 (12) Å | µ = 0.09 mm−1 |
c = 11.8556 (9) Å | T = 298 K |
V = 1993.6 (3) Å3 | Block, colourless |
Z = 4 | 0.20 × 0.10 × 0.10 mm |
F(000) = 816 |
Bruker SMART CCD area-detector diffractometer | 1653 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.077 |
Graphite monochromator | θmax = 27.0°, θmin = 2.1° |
φ and ω scans | h = −9→13 |
11761 measured reflections | k = −20→20 |
2278 independent reflections | l = −12→15 |
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)] = 0.048 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.108 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.98 | w = 1/[σ2(Fo2) + (0.0503P)2] where P = (Fo2 + 2Fc2)/3 |
2278 reflections | (Δ/σ)max < 0.001 |
274 parameters | Δρmax = 0.14 e Å−3 |
1 restraint | Δρmin = −0.16 e Å−3 |
C21H17N5O2·H2O | V = 1993.6 (3) Å3 |
Mr = 389.41 | Z = 4 |
Orthorhombic, Pna21 | Mo Kα radiation |
a = 10.3490 (8) Å | µ = 0.09 mm−1 |
b = 16.2487 (12) Å | T = 298 K |
c = 11.8556 (9) Å | 0.20 × 0.10 × 0.10 mm |
Bruker SMART CCD area-detector diffractometer | 1653 reflections with I > 2σ(I) |
11761 measured reflections | Rint = 0.077 |
2278 independent reflections |
R[F2 > 2σ(F2)] = 0.048 | 1 restraint |
wR(F2) = 0.108 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.98 | Δρmax = 0.14 e Å−3 |
2278 reflections | Δρmin = −0.16 e Å−3 |
274 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 | ||
C1 | 0.1229 (3) | 0.68779 (19) | 0.7135 (3) | 0.0417 (7) | |
C2 | 0.0307 (3) | 0.6861 (2) | 0.7975 (3) | 0.0560 (9) | |
H2 | −0.0476 | 0.7133 | 0.7885 | 0.067* | |
C3 | 0.0570 (4) | 0.6437 (2) | 0.8943 (3) | 0.0674 (10) | |
H3 | −0.0035 | 0.6416 | 0.9522 | 0.081* | |
C4 | 0.1735 (3) | 0.6041 (2) | 0.9053 (3) | 0.0575 (9) | |
H4 | 0.1934 | 0.5748 | 0.9704 | 0.069* | |
C5 | 0.2607 (3) | 0.60884 (18) | 0.8169 (3) | 0.0426 (7) | |
C6 | 0.0924 (3) | 0.73123 (18) | 0.6064 (3) | 0.0456 (7) | |
C7 | 0.2320 (4) | 0.7503 (2) | 0.3423 (3) | 0.0591 (10) | |
H7 | 0.3023 | 0.7157 | 0.3541 | 0.071* | |
C8 | 0.2124 (3) | 0.7865 (2) | 0.2314 (3) | 0.0538 (8) | |
C9 | 0.2824 (4) | 0.7571 (2) | 0.1402 (3) | 0.0693 (11) | |
H9 | 0.3439 | 0.7161 | 0.1512 | 0.083* | |
C10 | 0.2617 (4) | 0.7881 (3) | 0.0331 (3) | 0.0757 (12) | |
H10 | 0.3082 | 0.7673 | −0.0277 | 0.091* | |
C11 | 0.1732 (4) | 0.8494 (3) | 0.0162 (4) | 0.0751 (12) | |
H11 | 0.1598 | 0.8704 | −0.0558 | 0.090* | |
C12 | 0.1055 (4) | 0.8790 (2) | 0.1043 (3) | 0.0689 (11) | |
H12 | 0.0455 | 0.9208 | 0.0923 | 0.083* | |
C13 | 0.1232 (3) | 0.8489 (2) | 0.2117 (3) | 0.0597 (9) | |
H13 | 0.0753 | 0.8703 | 0.2712 | 0.072* | |
C14 | 0.3879 (3) | 0.56512 (19) | 0.8299 (3) | 0.0463 (8) | |
C15 | 0.6689 (3) | 0.5587 (2) | 0.6706 (3) | 0.0515 (8) | |
H15 | 0.6409 | 0.5909 | 0.6106 | 0.062* | |
C16 | 0.8009 (3) | 0.5264 (2) | 0.6703 (3) | 0.0546 (9) | |
C17 | 0.8874 (3) | 0.5537 (2) | 0.5896 (3) | 0.0621 (9) | |
H17 | 0.8617 | 0.5924 | 0.5365 | 0.075* | |
C18 | 1.0127 (4) | 0.5230 (3) | 0.5881 (4) | 0.0775 (13) | |
H18 | 1.0708 | 0.5413 | 0.5337 | 0.093* | |
C19 | 1.0508 (4) | 0.4663 (3) | 0.6659 (5) | 0.0834 (14) | |
H19 | 1.1349 | 0.4461 | 0.6649 | 0.100* | |
C20 | 0.9653 (4) | 0.4391 (3) | 0.7455 (5) | 0.0863 (13) | |
H20 | 0.9915 | 0.4002 | 0.7982 | 0.104* | |
C21 | 0.8410 (3) | 0.4687 (2) | 0.7486 (4) | 0.0705 (11) | |
H21 | 0.7837 | 0.4498 | 0.8032 | 0.085* | |
N1 | 0.2374 (2) | 0.64974 (15) | 0.7219 (2) | 0.0418 (6) | |
N2 | 0.1809 (3) | 0.72613 (19) | 0.5239 (3) | 0.0575 (8) | |
N3 | 0.1550 (2) | 0.76508 (16) | 0.4236 (2) | 0.0553 (7) | |
N4 | 0.4704 (3) | 0.57779 (18) | 0.7442 (2) | 0.0497 (7) | |
N5 | 0.5920 (2) | 0.54337 (16) | 0.7514 (2) | 0.0514 (7) | |
O1 | −0.0089 (2) | 0.76993 (14) | 0.5958 (2) | 0.0605 (6) | |
O2 | 0.4109 (2) | 0.52270 (15) | 0.9118 (2) | 0.0654 (7) | |
O3 | 0.3994 (3) | 0.60103 (18) | 0.4627 (3) | 0.0724 (8) | |
H4A | 0.454 (4) | 0.605 (2) | 0.683 (4) | 0.087* | |
H2A | 0.244 (4) | 0.693 (3) | 0.535 (4) | 0.087* | |
H3B | 0.431 (4) | 0.551 (3) | 0.445 (4) | 0.109* | |
H3A | 0.458 (4) | 0.637 (3) | 0.470 (5) | 0.109* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0390 (16) | 0.0443 (16) | 0.0419 (18) | 0.0012 (13) | 0.0026 (13) | 0.0021 (13) |
C2 | 0.051 (2) | 0.063 (2) | 0.054 (2) | 0.0104 (16) | 0.0116 (17) | 0.0085 (18) |
C3 | 0.061 (2) | 0.088 (3) | 0.053 (2) | 0.0149 (19) | 0.0240 (18) | 0.017 (2) |
C4 | 0.064 (2) | 0.064 (2) | 0.044 (2) | 0.0074 (17) | 0.0107 (16) | 0.0135 (17) |
C5 | 0.0456 (18) | 0.0419 (16) | 0.0403 (18) | −0.0040 (13) | 0.0027 (14) | 0.0041 (14) |
C6 | 0.0435 (17) | 0.0439 (17) | 0.0495 (19) | 0.0039 (14) | 0.0022 (15) | 0.0026 (15) |
C7 | 0.055 (2) | 0.065 (2) | 0.057 (2) | 0.0169 (17) | 0.0111 (17) | 0.0182 (19) |
C8 | 0.0539 (19) | 0.057 (2) | 0.051 (2) | 0.0010 (16) | 0.0118 (16) | 0.0071 (17) |
C9 | 0.075 (3) | 0.066 (2) | 0.067 (3) | −0.002 (2) | 0.023 (2) | 0.000 (2) |
C10 | 0.092 (3) | 0.085 (3) | 0.049 (2) | −0.026 (3) | 0.026 (2) | −0.014 (2) |
C11 | 0.085 (3) | 0.094 (3) | 0.046 (2) | −0.025 (3) | −0.004 (2) | 0.012 (2) |
C12 | 0.067 (2) | 0.085 (3) | 0.055 (2) | 0.0016 (19) | −0.004 (2) | 0.018 (2) |
C13 | 0.059 (2) | 0.072 (2) | 0.048 (2) | 0.0052 (18) | 0.0053 (17) | 0.0113 (18) |
C14 | 0.0490 (19) | 0.0480 (18) | 0.0418 (18) | −0.0008 (14) | −0.0016 (14) | 0.0046 (15) |
C15 | 0.0486 (19) | 0.0551 (19) | 0.051 (2) | 0.0092 (15) | −0.0054 (16) | −0.0033 (17) |
C16 | 0.0448 (18) | 0.055 (2) | 0.064 (2) | 0.0056 (15) | −0.0024 (17) | −0.0187 (18) |
C17 | 0.053 (2) | 0.064 (2) | 0.069 (3) | −0.0008 (17) | 0.0032 (18) | −0.016 (2) |
C18 | 0.056 (2) | 0.084 (3) | 0.093 (3) | −0.011 (2) | 0.020 (2) | −0.034 (3) |
C19 | 0.052 (2) | 0.087 (3) | 0.112 (4) | 0.017 (2) | −0.012 (3) | −0.033 (3) |
C20 | 0.062 (2) | 0.094 (3) | 0.102 (4) | 0.024 (2) | −0.010 (3) | −0.003 (3) |
C21 | 0.055 (2) | 0.082 (3) | 0.074 (3) | 0.0168 (19) | 0.003 (2) | −0.001 (2) |
N1 | 0.0399 (13) | 0.0447 (13) | 0.0409 (15) | −0.0007 (11) | 0.0034 (11) | 0.0062 (12) |
N2 | 0.0509 (17) | 0.072 (2) | 0.0499 (17) | 0.0186 (14) | 0.0112 (14) | 0.0248 (15) |
N3 | 0.0534 (16) | 0.0626 (17) | 0.0498 (18) | 0.0096 (13) | 0.0082 (14) | 0.0172 (15) |
N4 | 0.0430 (14) | 0.0621 (17) | 0.0441 (16) | 0.0105 (12) | −0.0008 (12) | 0.0084 (13) |
N5 | 0.0440 (15) | 0.0594 (16) | 0.0508 (17) | 0.0110 (12) | −0.0021 (13) | 0.0029 (14) |
O1 | 0.0526 (13) | 0.0707 (15) | 0.0581 (15) | 0.0241 (11) | 0.0065 (12) | 0.0106 (13) |
O2 | 0.0650 (15) | 0.0791 (16) | 0.0521 (15) | 0.0141 (12) | 0.0000 (11) | 0.0228 (14) |
O3 | 0.0643 (17) | 0.0628 (16) | 0.090 (2) | 0.0070 (13) | 0.0042 (14) | −0.0171 (15) |
C1—N1 | 1.340 (4) | C12—H12 | 0.9300 |
C1—C2 | 1.380 (4) | C13—H13 | 0.9300 |
C1—C6 | 1.486 (4) | C14—O2 | 1.214 (4) |
C2—C3 | 1.366 (5) | C14—N4 | 1.343 (4) |
C2—H2 | 0.9300 | C15—N5 | 1.271 (4) |
C3—C4 | 1.373 (5) | C15—C16 | 1.463 (4) |
C3—H3 | 0.9300 | C15—H15 | 0.9300 |
C4—C5 | 1.385 (4) | C16—C17 | 1.383 (5) |
C4—H4 | 0.9300 | C16—C21 | 1.383 (5) |
C5—N1 | 1.330 (4) | C17—C18 | 1.389 (5) |
C5—C14 | 1.504 (4) | C17—H17 | 0.9300 |
C6—O1 | 1.229 (3) | C18—C19 | 1.363 (7) |
C6—N2 | 1.343 (4) | C18—H18 | 0.9300 |
C7—N3 | 1.274 (4) | C19—C20 | 1.367 (7) |
C7—C8 | 1.454 (5) | C19—H19 | 0.9300 |
C7—H7 | 0.9300 | C20—C21 | 1.373 (5) |
C8—C9 | 1.387 (5) | C20—H20 | 0.9300 |
C8—C13 | 1.391 (5) | C21—H21 | 0.9300 |
C9—C10 | 1.383 (6) | N2—N3 | 1.374 (4) |
C9—H9 | 0.9300 | N2—H2A | 0.86 (4) |
C10—C11 | 1.367 (6) | N4—N5 | 1.380 (3) |
C10—H10 | 0.9300 | N4—H4A | 0.87 (4) |
C11—C12 | 1.347 (6) | O3—H3B | 0.90 (4) |
C11—H11 | 0.9300 | O3—H3A | 0.85 (5) |
C12—C13 | 1.376 (5) | ||
N1—C1—C2 | 123.2 (3) | C12—C13—H13 | 119.9 |
N1—C1—C6 | 118.1 (2) | C8—C13—H13 | 119.9 |
C2—C1—C6 | 118.6 (3) | O2—C14—N4 | 124.6 (3) |
C3—C2—C1 | 118.6 (3) | O2—C14—C5 | 121.5 (3) |
C3—C2—H2 | 120.7 | N4—C14—C5 | 114.0 (3) |
C1—C2—H2 | 120.7 | N5—C15—C16 | 121.1 (3) |
C2—C3—C4 | 119.4 (3) | N5—C15—H15 | 119.4 |
C2—C3—H3 | 120.3 | C16—C15—H15 | 119.4 |
C4—C3—H3 | 120.3 | C17—C16—C21 | 119.2 (3) |
C3—C4—C5 | 118.3 (3) | C17—C16—C15 | 119.4 (3) |
C3—C4—H4 | 120.9 | C21—C16—C15 | 121.4 (3) |
C5—C4—H4 | 120.9 | C16—C17—C18 | 119.9 (4) |
N1—C5—C4 | 123.4 (3) | C16—C17—H17 | 120.0 |
N1—C5—C14 | 118.8 (3) | C18—C17—H17 | 120.0 |
C4—C5—C14 | 117.8 (3) | C19—C18—C17 | 120.2 (4) |
O1—C6—N2 | 122.6 (3) | C19—C18—H18 | 119.9 |
O1—C6—C1 | 120.8 (3) | C17—C18—H18 | 119.9 |
N2—C6—C1 | 116.6 (3) | C18—C19—C20 | 119.9 (4) |
N3—C7—C8 | 121.4 (3) | C18—C19—H19 | 120.0 |
N3—C7—H7 | 119.3 | C20—C19—H19 | 120.0 |
C8—C7—H7 | 119.3 | C19—C20—C21 | 120.8 (5) |
C9—C8—C13 | 117.8 (3) | C19—C20—H20 | 119.6 |
C9—C8—C7 | 119.5 (3) | C21—C20—H20 | 119.6 |
C13—C8—C7 | 122.6 (3) | C20—C21—C16 | 120.0 (4) |
C10—C9—C8 | 120.6 (4) | C20—C21—H21 | 120.0 |
C10—C9—H9 | 119.7 | C16—C21—H21 | 120.0 |
C8—C9—H9 | 119.7 | C5—N1—C1 | 117.0 (2) |
C11—C10—C9 | 120.3 (4) | C6—N2—N3 | 118.0 (3) |
C11—C10—H10 | 119.9 | C6—N2—H2A | 117 (3) |
C9—C10—H10 | 119.9 | N3—N2—H2A | 125 (3) |
C12—C11—C10 | 119.7 (4) | C7—N3—N2 | 116.5 (3) |
C12—C11—H11 | 120.2 | C14—N4—N5 | 118.1 (3) |
C10—C11—H11 | 120.2 | C14—N4—H4A | 126 (3) |
C11—C12—C13 | 121.4 (4) | N5—N4—H4A | 116 (3) |
C11—C12—H12 | 119.3 | C15—N5—N4 | 116.5 (3) |
C13—C12—H12 | 119.3 | H3B—O3—H3A | 113 (4) |
C12—C13—C8 | 120.2 (3) | ||
N1—C1—C2—C3 | 0.0 (5) | C4—C5—C14—N4 | −175.4 (3) |
C6—C1—C2—C3 | 177.6 (3) | N5—C15—C16—C17 | −170.8 (3) |
C1—C2—C3—C4 | 0.0 (6) | N5—C15—C16—C21 | 9.7 (5) |
C2—C3—C4—C5 | 0.0 (6) | C21—C16—C17—C18 | −0.1 (5) |
C3—C4—C5—N1 | 0.0 (5) | C15—C16—C17—C18 | −179.6 (3) |
C3—C4—C5—C14 | −179.9 (3) | C16—C17—C18—C19 | −0.1 (6) |
N1—C1—C6—O1 | −177.0 (3) | C17—C18—C19—C20 | 0.3 (6) |
C2—C1—C6—O1 | 5.2 (4) | C18—C19—C20—C21 | −0.4 (7) |
N1—C1—C6—N2 | 2.6 (4) | C19—C20—C21—C16 | 0.2 (7) |
C2—C1—C6—N2 | −175.2 (3) | C17—C16—C21—C20 | 0.0 (6) |
N3—C7—C8—C9 | −167.6 (4) | C15—C16—C21—C20 | 179.5 (4) |
N3—C7—C8—C13 | 10.9 (6) | C4—C5—N1—C1 | 0.0 (4) |
C13—C8—C9—C10 | −1.2 (6) | C14—C5—N1—C1 | 179.9 (3) |
C7—C8—C9—C10 | 177.3 (4) | C2—C1—N1—C5 | 0.0 (4) |
C8—C9—C10—C11 | 1.1 (6) | C6—C1—N1—C5 | −177.7 (3) |
C9—C10—C11—C12 | −0.4 (6) | O1—C6—N2—N3 | −0.9 (5) |
C10—C11—C12—C13 | −0.1 (6) | C1—C6—N2—N3 | 179.5 (3) |
C11—C12—C13—C8 | 0.0 (6) | C8—C7—N3—N2 | 178.5 (3) |
C9—C8—C13—C12 | 0.7 (5) | C6—N2—N3—C7 | −171.0 (3) |
C7—C8—C13—C12 | −177.8 (4) | O2—C14—N4—N5 | −3.0 (5) |
N1—C5—C14—O2 | −175.3 (3) | C5—C14—N4—N5 | 176.9 (3) |
C4—C5—C14—O2 | 4.6 (5) | C16—C15—N5—N4 | 179.0 (3) |
N1—C5—C14—N4 | 4.7 (4) | C14—N4—N5—C15 | −177.9 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7···O3 | 0.93 | 2.48 | 3.305 (5) | 148 |
N2—H2A···O3 | 0.86 (4) | 2.35 (4) | 3.126 (4) | 150 (4) |
O3—H3B···O2i | 0.90 (4) | 2.06 (4) | 2.874 (3) | 149 (4) |
N4—H4A···O1ii | 0.87 (4) | 2.32 (4) | 3.044 (4) | 142 (4) |
O3—H3A···O1ii | 0.85 (5) | 2.14 (5) | 2.790 (4) | 133 (5) |
Symmetry codes: (i) −x+1, −y+1, z−1/2; (ii) x+1/2, −y+3/2, z. |
Experimental details
Crystal data | |
Chemical formula | C21H17N5O2·H2O |
Mr | 389.41 |
Crystal system, space group | Orthorhombic, Pna21 |
Temperature (K) | 298 |
a, b, c (Å) | 10.3490 (8), 16.2487 (12), 11.8556 (9) |
V (Å3) | 1993.6 (3) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.20 × 0.10 × 0.10 |
Data collection | |
Diffractometer | Bruker SMART CCD area-detector |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 11761, 2278, 1653 |
Rint | 0.077 |
(sin θ/λ)max (Å−1) | 0.639 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.048, 0.108, 0.98 |
No. of reflections | 2278 |
No. of parameters | 274 |
No. of restraints | 1 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.14, −0.16 |
Computer programs: SMART (Bruker, 2001), SMART-Plus (Bruker, 2001), SAINT, SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), PLATON (Spek, 2003), SHELXTL.
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7···O3 | 0.93 | 2.48 | 3.305 (5) | 148.2 |
N2—H2A···O3 | 0.86 (4) | 2.35 (4) | 3.126 (4) | 150 (4) |
O3—H3B···O2i | 0.90 (4) | 2.06 (4) | 2.874 (3) | 149 (4) |
N4—H4A···O1ii | 0.87 (4) | 2.32 (4) | 3.044 (4) | 142 (4) |
O3—H3A···O1ii | 0.85 (5) | 2.14 (5) | 2.790 (4) | 133 (5) |
Symmetry codes: (i) −x+1, −y+1, z−1/2; (ii) x+1/2, −y+3/2, z. |
Tridentate ligands containing the 2,6-dipicolinoyhydrazone moiety have been intensively studied due to their interesting coordination mode (Chen et al., 1997; Thompson et al.,2002; Zhao et al., 2004).
The molecules are linked into a three dimensional framework by a combination of N–H···O C—H···O and O—H···O hydrogen bonds.