organic compounds
E)-[2-(pyridin-4-ylcarbonyl)hydrazin-1-ylidene]methyl}phenyl acetate monohydrate
of 4-{(aDepartment of Chemistry, Christ University, Hosur Road, Bangalore 560 029, India, bDepartment of Chemistry, Faculty of Science, Eastern University, Sri Lanka, Chenkalady, Sri Lanka, and cDepartment of Applied Chemistry, Cochin University of Science and Technology, Kochi 682 022, India
*Correspondence e-mail: msithambaresan@gmail.com
The 15H13N3O3·H2O, comprises a 4-{(E)-[2-(pyridin-4-ylcarbonyl)hydrazinylidene]methyl}phenyl acetate molecule and a solvent water molecule linked by O—H⋯O and O—H⋯N hydrogen bonds from the water molecule and a C—H⋯O contact from the organic molecule. The compound adopts an E conformation with respect to the azomethine bond and the dihedral angle between the pyridine and benzene rings is 21.90 (7)°. The azomethine bond [1.275 (2) Å] distance is very close to the formal C=N bond length, which confirms the azomethine bond formation. An extensive set of O—H⋯O, O—H⋯N, N—H⋯O and C—H⋯O hydrogen bonds builds a two-dimensional network progressing along the c axis.
of the title compound, CKeywords: crystal structure; hydrazone; aroyl hydrazone; hydrogen bonding.
CCDC reference: 1040455
1. Related literature
For biological applications of hydrazone derivatives, see: Sreeja et al. (2004); Prasanna & Kumar (2013). For the synthesis of related compounds, see: Joseph et al. (2013); Thilagavathi et al. (2010). For the anticancer activity of against cervical cancer, see: Nair et al. (2014).
2. Experimental
2.1. Crystal data
|
2.3. Refinement
|
Data collection: APEX2 (Bruker, 2004); cell APEX2 and SAINT (Bruker, 2004); data reduction: SAINT and XPREP (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg, 2010); software used to prepare material for publication: SHELXL97 and publCIF (Westrip, 2010).
Supporting information
CCDC reference: 1040455
10.1107/S2056989014027819/sj5434sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S2056989014027819/sj5434Isup2.hkl
Supporting information file. DOI: 10.1107/S2056989014027819/sj5434Isup3.cml
Hydrazone derivatives are found to have structural diversity due to their coordinative ability (Sreeja et al., 2004; Prasanna & Kumar, 2013) arising from thioamido-thioiminol ═N3 bond and O1 and N3 are cis with respect to the C6—N2 bond (Fig. 1). The dihedral angle between the pyridine and benzene rings is 21.90 (7) Å. The C7═N3 [1.275 (2) Å] bond distances are very close to the formal C═N bond length, which confirms the azomethine bond formation.
Ruthenium(II) complexes with such compounds as ligands have been shown to function as catalysts (Thilagavathi et al., 2010). The title compound [C15H13N3O3].(H2O) adopts an E configuration with respect to C7There are four classical intermolecular O—H···O, O—H···N and N—H···O hydrogen bonds and three non-classical C—H···O interactions, (Table 1, Figure 2). These intermolecular hydrogen bonds build a two-dimensional network progressing along the c axis (Fig. 3). Fig. 4 shows the packing diagram of the title compound along the a axis.
The title compound was synthesised by adapting a reported procedure (Joseph et al., 2013). A solution of isonicotinic acid hydrazide (0.137 g, 1 mmol) in methanol/DMF (1:1 v/v, 10 ml) was mixed with a methanol /DMF solution (10 ml) of 4-formylphenyl acetate (0.164 g, 1 mmol). The mixture was refluxed for 6 h and then cooled to room temperature. The resulting solid was recrystallized from chloroform/methanol (1:1 v/v). Colorless, block shaped crystals suitable for XRD studies were obtained after slow evaporation of the solution in air over several days.
Crystal data, data collection and structure
details are summarized in Table 1. All H atoms bound to C were placed in calculated positions, guided by difference maps, with C—H bond distances of 0.93-0.96 Å. H atoms were assigned Uiso(H) values of 1.2Ueq(carrier). H2 on N2 and H1S & H2S of the water molecule were located in a difference Fourier map and refined with the bond distances restrained to 0.88±0.01 and 0.86±0.02 Å respectively. The low angle reflection (1 0 0) was omitted from the refinement.Data collection: APEX2 (Bruker, 2004); cell
APEX2 and SAINT (Bruker, 2004); data reduction: SAINT and XPREP (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg, 2010); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and publCIF (Westrip, 2010).Fig. 1. An ORTEP view of the compound, with 50% probability displacement ellipsoids for the non-H atoms. | |
Fig. 2. Graphical representation showing hydrogen bonding interactions in the crystal structure of [C15H13N3O3]·(H2O). | |
Fig. 3. The hydrogen bonding interactions build a double layer progressing along the c axis in the title compound. | |
Fig. 4. A view of the overall crystal packing along the a axis. |
C15H13N3O3·H2O | F(000) = 632 |
Mr = 301.30 | Dx = 1.359 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
a = 17.3297 (15) Å | Cell parameters from 4335 reflections |
b = 7.3058 (7) Å | θ = 3.1–28.1° |
c = 12.4632 (10) Å | µ = 0.10 mm−1 |
β = 111.034 (3)° | T = 296 K |
V = 1472.8 (2) Å3 | Block, colorless |
Z = 4 | 0.50 × 0.45 × 0.40 mm |
Bruker APEXII CCD diffractometer | 2614 independent reflections |
Radiation source: fine-focus sealed tube | 2153 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.028 |
ω and ϕ scans | θmax = 25.1°, θmin = 3.1° |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | h = −20→15 |
Tmin = 0.951, Tmax = 0.961 | k = −8→8 |
8648 measured reflections | l = −11→14 |
Refinement on F2 | Hydrogen site location: mixed |
Least-squares matrix: full | H atoms treated by a mixture of independent and constrained refinement |
R[F2 > 2σ(F2)] = 0.037 | w = 1/[σ2(Fo2) + (0.0674P)2 + 0.4633P] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.113 | (Δ/σ)max < 0.001 |
S = 0.94 | Δρmax = 0.21 e Å−3 |
2614 reflections | Δρmin = −0.17 e Å−3 |
213 parameters | Extinction correction: SHELXL2014 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
4 restraints | Extinction coefficient: 0.024 (3) |
C15H13N3O3·H2O | V = 1472.8 (2) Å3 |
Mr = 301.30 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 17.3297 (15) Å | µ = 0.10 mm−1 |
b = 7.3058 (7) Å | T = 296 K |
c = 12.4632 (10) Å | 0.50 × 0.45 × 0.40 mm |
β = 111.034 (3)° |
Bruker APEXII CCD diffractometer | 2614 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | 2153 reflections with I > 2σ(I) |
Tmin = 0.951, Tmax = 0.961 | Rint = 0.028 |
8648 measured reflections |
R[F2 > 2σ(F2)] = 0.037 | 4 restraints |
wR(F2) = 0.113 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.94 | Δρmax = 0.21 e Å−3 |
2614 reflections | Δρmin = −0.17 e Å−3 |
213 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. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.16188 (10) | 0.0685 (2) | 0.93233 (14) | 0.0400 (4) | |
H1 | 0.2096 | 0.0125 | 0.9817 | 0.048* | |
C2 | 0.08732 (10) | 0.0473 (2) | 0.94865 (14) | 0.0427 (4) | |
H2 | 0.0868 | −0.0231 | 1.0105 | 0.051* | |
C3 | 0.01996 (10) | 0.2228 (3) | 0.79347 (15) | 0.0476 (4) | |
H3 | −0.0287 | 0.2763 | 0.7449 | 0.057* | |
C4 | 0.09113 (10) | 0.2527 (2) | 0.77045 (14) | 0.0423 (4) | |
H4 | 0.0899 | 0.3245 | 0.7082 | 0.051* | |
C5 | 0.16422 (9) | 0.1743 (2) | 0.84140 (12) | 0.0340 (4) | |
C6 | 0.24113 (9) | 0.2125 (2) | 0.81590 (13) | 0.0369 (4) | |
C7 | 0.45140 (9) | 0.2232 (2) | 0.97566 (13) | 0.0367 (4) | |
H7 | 0.4483 | 0.1754 | 1.0431 | 0.044* | |
C8 | 0.53158 (9) | 0.2825 (2) | 0.97427 (13) | 0.0340 (4) | |
C9 | 0.54021 (9) | 0.3707 (2) | 0.87968 (13) | 0.0380 (4) | |
H9 | 0.4941 | 0.3887 | 0.8134 | 0.046* | |
C10 | 0.61707 (10) | 0.4314 (2) | 0.88411 (13) | 0.0388 (4) | |
H10 | 0.6229 | 0.4915 | 0.8216 | 0.047* | |
C11 | 0.68496 (9) | 0.4011 (2) | 0.98292 (14) | 0.0364 (4) | |
C12 | 0.67832 (9) | 0.3173 (2) | 1.07787 (13) | 0.0397 (4) | |
H12 | 0.7247 | 0.3000 | 1.1440 | 0.048* | |
C13 | 0.60111 (10) | 0.2590 (2) | 1.07295 (14) | 0.0395 (4) | |
H13 | 0.5957 | 0.2030 | 1.1369 | 0.047* | |
C14 | 0.80143 (9) | 0.3873 (2) | 0.92676 (13) | 0.0367 (4) | |
C15 | 0.88679 (10) | 0.4588 (3) | 0.95589 (16) | 0.0483 (4) | |
H15A | 0.9127 | 0.3993 | 0.9089 | 0.072* | |
H15B | 0.9181 | 0.4351 | 1.0354 | 0.072* | |
H15C | 0.8847 | 0.5884 | 0.9421 | 0.072* | |
N1 | 0.01652 (8) | 0.1220 (2) | 0.88093 (12) | 0.0455 (4) | |
N2 | 0.31362 (7) | 0.18494 (18) | 0.90293 (11) | 0.0358 (3) | |
N3 | 0.38562 (8) | 0.23535 (18) | 0.88687 (11) | 0.0369 (3) | |
O1 | 0.23649 (7) | 0.2689 (2) | 0.72122 (10) | 0.0589 (4) | |
O1S | 0.35113 (8) | 0.4455 (2) | 0.64055 (10) | 0.0480 (3) | |
O2 | 0.76382 (7) | 0.46558 (16) | 0.99337 (10) | 0.0446 (3) | |
O3 | 0.76890 (8) | 0.27267 (19) | 0.85709 (12) | 0.0598 (4) | |
H1S | 0.3278 (13) | 0.387 (3) | 0.6800 (18) | 0.080 (7)* | |
H2S | 0.3334 (15) | 0.554 (2) | 0.644 (2) | 0.094 (9)* | |
H2' | 0.3186 (11) | 0.148 (2) | 0.9725 (10) | 0.049 (5)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0310 (8) | 0.0445 (10) | 0.0443 (9) | −0.0027 (7) | 0.0131 (7) | 0.0066 (7) |
C2 | 0.0399 (9) | 0.0451 (10) | 0.0471 (9) | −0.0080 (8) | 0.0205 (7) | 0.0024 (7) |
C3 | 0.0328 (9) | 0.0593 (12) | 0.0497 (10) | 0.0064 (8) | 0.0138 (7) | 0.0032 (8) |
C4 | 0.0376 (9) | 0.0498 (10) | 0.0412 (8) | 0.0021 (8) | 0.0162 (7) | 0.0055 (7) |
C5 | 0.0308 (8) | 0.0363 (9) | 0.0357 (8) | −0.0045 (7) | 0.0132 (6) | −0.0039 (6) |
C6 | 0.0343 (8) | 0.0403 (9) | 0.0385 (8) | −0.0059 (7) | 0.0158 (7) | 0.0003 (7) |
C7 | 0.0347 (9) | 0.0365 (9) | 0.0435 (9) | −0.0015 (7) | 0.0199 (7) | 0.0004 (7) |
C8 | 0.0303 (8) | 0.0330 (8) | 0.0419 (8) | 0.0002 (6) | 0.0169 (6) | −0.0039 (6) |
C9 | 0.0317 (8) | 0.0445 (9) | 0.0373 (8) | −0.0010 (7) | 0.0118 (6) | −0.0013 (7) |
C10 | 0.0391 (9) | 0.0441 (9) | 0.0379 (8) | −0.0048 (7) | 0.0196 (7) | −0.0012 (7) |
C11 | 0.0304 (8) | 0.0386 (9) | 0.0443 (8) | −0.0071 (7) | 0.0184 (7) | −0.0121 (7) |
C12 | 0.0315 (8) | 0.0465 (10) | 0.0395 (8) | 0.0005 (7) | 0.0106 (7) | −0.0013 (7) |
C13 | 0.0388 (9) | 0.0426 (9) | 0.0400 (8) | −0.0003 (7) | 0.0176 (7) | 0.0040 (7) |
C14 | 0.0351 (8) | 0.0394 (9) | 0.0378 (8) | 0.0001 (7) | 0.0157 (7) | −0.0018 (7) |
C15 | 0.0375 (9) | 0.0532 (11) | 0.0600 (10) | −0.0045 (8) | 0.0246 (8) | −0.0013 (8) |
N1 | 0.0352 (8) | 0.0526 (9) | 0.0534 (8) | −0.0053 (7) | 0.0216 (7) | −0.0049 (7) |
N2 | 0.0286 (7) | 0.0437 (8) | 0.0394 (7) | −0.0049 (6) | 0.0174 (6) | 0.0019 (6) |
N3 | 0.0305 (7) | 0.0402 (8) | 0.0455 (7) | −0.0042 (6) | 0.0203 (6) | −0.0011 (6) |
O1 | 0.0413 (7) | 0.0937 (11) | 0.0431 (7) | −0.0115 (7) | 0.0168 (5) | 0.0149 (7) |
O1S | 0.0471 (7) | 0.0572 (9) | 0.0459 (7) | 0.0022 (6) | 0.0241 (6) | 0.0071 (6) |
O2 | 0.0342 (6) | 0.0543 (7) | 0.0512 (7) | −0.0151 (5) | 0.0223 (5) | −0.0191 (5) |
O3 | 0.0482 (8) | 0.0701 (9) | 0.0660 (8) | −0.0102 (7) | 0.0266 (6) | −0.0306 (7) |
C1—C2 | 1.387 (2) | C9—H9 | 0.9300 |
C1—C5 | 1.384 (2) | C10—C11 | 1.382 (2) |
C1—H1 | 0.9300 | C10—H10 | 0.9300 |
C2—N1 | 1.331 (2) | C11—C12 | 1.374 (2) |
C2—H2 | 0.9300 | C11—O2 | 1.4066 (18) |
C3—N1 | 1.334 (2) | C12—C13 | 1.384 (2) |
C3—C4 | 1.380 (2) | C12—H12 | 0.9300 |
C3—H3 | 0.9300 | C13—H13 | 0.9300 |
C4—C5 | 1.382 (2) | C14—O3 | 1.1921 (19) |
C4—H4 | 0.9300 | C14—O2 | 1.3527 (18) |
C5—C6 | 1.503 (2) | C14—C15 | 1.486 (2) |
C6—O1 | 1.2252 (19) | C15—H15A | 0.9600 |
C6—N2 | 1.348 (2) | C15—H15B | 0.9600 |
C7—N3 | 1.275 (2) | C15—H15C | 0.9600 |
C7—C8 | 1.462 (2) | N2—N3 | 1.3827 (17) |
C7—H7 | 0.9300 | N2—H2' | 0.883 (9) |
C8—C13 | 1.389 (2) | O1S—H1S | 0.857 (16) |
C8—C9 | 1.398 (2) | O1S—H2S | 0.860 (16) |
C9—C10 | 1.386 (2) | ||
C2—C1—C5 | 119.01 (15) | C11—C10—H10 | 120.6 |
C2—C1—H1 | 120.5 | C9—C10—H10 | 120.6 |
C5—C1—H1 | 120.5 | C12—C11—C10 | 122.10 (14) |
N1—C2—C1 | 123.81 (15) | C12—C11—O2 | 116.65 (14) |
N1—C2—H2 | 118.1 | C10—C11—O2 | 121.14 (14) |
C1—C2—H2 | 118.1 | C11—C12—C13 | 118.52 (14) |
N1—C3—C4 | 124.23 (16) | C11—C12—H12 | 120.7 |
N1—C3—H3 | 117.9 | C13—C12—H12 | 120.7 |
C4—C3—H3 | 117.9 | C12—C13—C8 | 121.23 (15) |
C3—C4—C5 | 118.91 (15) | C12—C13—H13 | 119.4 |
C3—C4—H4 | 120.5 | C8—C13—H13 | 119.4 |
C5—C4—H4 | 120.5 | O3—C14—O2 | 122.55 (14) |
C4—C5—C1 | 117.75 (14) | O3—C14—C15 | 126.45 (15) |
C4—C5—C6 | 117.81 (14) | O2—C14—C15 | 110.97 (14) |
C1—C5—C6 | 124.43 (14) | C14—C15—H15A | 109.5 |
O1—C6—N2 | 123.04 (14) | C14—C15—H15B | 109.5 |
O1—C6—C5 | 120.63 (14) | H15A—C15—H15B | 109.5 |
N2—C6—C5 | 116.31 (13) | C14—C15—H15C | 109.5 |
N3—C7—C8 | 121.78 (14) | H15A—C15—H15C | 109.5 |
N3—C7—H7 | 119.1 | H15B—C15—H15C | 109.5 |
C8—C7—H7 | 119.1 | C2—N1—C3 | 116.29 (14) |
C13—C8—C9 | 118.84 (14) | C6—N2—N3 | 118.20 (12) |
C13—C8—C7 | 118.62 (14) | C6—N2—H2' | 124.8 (11) |
C9—C8—C7 | 122.45 (14) | N3—N2—H2' | 116.7 (11) |
C10—C9—C8 | 120.40 (14) | C7—N3—N2 | 115.33 (13) |
C10—C9—H9 | 119.8 | H1S—O1S—H2S | 100.4 (19) |
C8—C9—H9 | 119.8 | C14—O2—C11 | 117.88 (12) |
C11—C10—C9 | 118.88 (14) | ||
C5—C1—C2—N1 | 0.6 (3) | C9—C10—C11—O2 | −177.75 (14) |
N1—C3—C4—C5 | 0.1 (3) | C10—C11—C12—C13 | 1.1 (2) |
C3—C4—C5—C1 | 0.2 (2) | O2—C11—C12—C13 | 177.22 (14) |
C3—C4—C5—C6 | −178.71 (15) | C11—C12—C13—C8 | 0.6 (2) |
C2—C1—C5—C4 | −0.5 (2) | C9—C8—C13—C12 | −1.5 (2) |
C2—C1—C5—C6 | 178.31 (14) | C7—C8—C13—C12 | −178.10 (15) |
C4—C5—C6—O1 | −18.5 (2) | C1—C2—N1—C3 | −0.3 (2) |
C1—C5—C6—O1 | 162.62 (17) | C4—C3—N1—C2 | −0.1 (3) |
C4—C5—C6—N2 | 160.04 (15) | O1—C6—N2—N3 | 4.8 (2) |
C1—C5—C6—N2 | −18.8 (2) | C5—C6—N2—N3 | −173.74 (12) |
N3—C7—C8—C13 | −177.64 (15) | C8—C7—N3—N2 | −176.06 (13) |
N3—C7—C8—C9 | 5.9 (2) | C6—N2—N3—C7 | 173.26 (14) |
C13—C8—C9—C10 | 0.8 (2) | O3—C14—O2—C11 | 3.2 (2) |
C7—C8—C9—C10 | 177.24 (15) | C15—C14—O2—C11 | −174.82 (14) |
C8—C9—C10—C11 | 0.8 (2) | C12—C11—O2—C14 | 115.34 (16) |
C9—C10—C11—C12 | −1.8 (2) | C10—C11—O2—C14 | −68.5 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
C1—H1···O1Si | 0.93 | 2.56 | 3.375 (2) | 147 |
C7—H7···O1Si | 0.93 | 2.56 | 3.3655 (19) | 145 |
C12—H12···O3i | 0.93 | 2.54 | 3.329 (2) | 143 |
N2—H2′···O1Si | 0.88 (1) | 2.08 (1) | 2.9529 (18) | 170 (2) |
O1S—H1S···N3 | 0.86 (2) | 2.65 (2) | 3.2897 (18) | 133 (2) |
O1S—H1S···O1 | 0.86 (2) | 2.02 (2) | 2.8382 (17) | 159 (2) |
O1S—H2S···O3ii | 0.86 (2) | 2.38 (2) | 3.1754 (19) | 154 (2) |
Symmetry codes: (i) x, −y+1/2, z+1/2; (ii) −x+1, y+1/2, −z+3/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
C1—H1···O1Si | 0.93 | 2.56 | 3.375 (2) | 146.8 |
C7—H7···O1Si | 0.93 | 2.56 | 3.3655 (19) | 145.1 |
C12—H12···O3i | 0.93 | 2.54 | 3.329 (2) | 142.6 |
N2—H2'···O1Si | 0.883 (9) | 2.079 (10) | 2.9529 (18) | 170.4 (16) |
O1S—H1S···N3 | 0.857 (16) | 2.65 (2) | 3.2897 (18) | 132.6 (19) |
O1S—H1S···O1 | 0.857 (16) | 2.021 (17) | 2.8382 (17) | 159 (2) |
O1S—H2S···O3ii | 0.860 (16) | 2.379 (19) | 3.1754 (19) | 154 (2) |
Symmetry codes: (i) x, −y+1/2, z+1/2; (ii) −x+1, y+1/2, −z+3/2. |
Acknowledgements
The authors are grateful to the Sophisticated Analytical Instruments Facility, Cochin University of Science and Technology, Kochi-22, India, for the diffraction measurements and thank Christ University for financial support.
References
Brandenburg, K. (2010). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Bruker (2004). SADABS, APEX2, XPREP and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849–854. Web of Science CrossRef CAS IUCr Journals Google Scholar
Joseph, B., Sithambaresan, M. & Kurup, M. R. P. (2013). Acta Cryst. E69, o1160–o1161. CSD CrossRef CAS IUCr Journals Google Scholar
Nair, R. S., Kuriakose, M., Somasundaram, V., Shenoi, V., Kurup, M. R. P. & Srinivas, P. (2014). Life Sci. 116, 90–97. CrossRef CAS PubMed Google Scholar
Prasanna, M. K. & Kumar, K. P. (2013). Int. J. Pharm. Biomed. Sci. 4, 24–29. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Sreeja, P. B., Kurup, M. R. P., Kishore, A. & Jasmin, C. (2004). Polyhedron, 23, 575–581. Web of Science CSD CrossRef CAS Google Scholar
Thilagavathi, N., Manimaran, A., Priya, N. P., Sathya, N. & Jayabalakrishnan, C. (2010). Appl. Organomet. Chem. 24, 301–307. CAS Google Scholar
Westrip, S. P. (2010). J. Appl. Cryst. 43, 920–925. Web of Science CrossRef CAS IUCr Journals Google Scholar
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.