metal-organic compounds
(Methanol-κO)-cis-dioxido{(4Z,N′E)-N′-[(Z)-4-oxido-4-phenylbut-3-en-2-ylidene]isonicotinohydrazidato}molybdenum(VI)
aSchool of Chemistry, University of Hyderabad, Gachibowli, Hyderabad, Andhra Pradesh 500 046, India
*Correspondence e-mail: ch10ph07@uohyd.ernet.in
In the title complex, [Mo(C16H13N3O2)O2(CH3OH)], the deprotonated Schiff base (E)-N′-[(Z)-4-oxido-4-phenylbut-3-en-2-ylidene]isonicotinohydrazide coordinates in a meridional fashion through the enolate O-, imine N- and amidate O-atom donors to the Mo atom of a cis-[MoO2]2+ core. The sixth coordination site of molybdenum is occupied by the O atom of a methanol molecule. In this complex, the NO5 coordination sphere adopts a distorted octahedral coordination geometry. The metal atom is shifted by 0.335 (1) Å from the square plane defined by the three donor atoms of the Schiff base ligand and one oxide group towards the second oxide group in the cis position. In the crystal, the complex forms inversion dimers through a pair of O—H⋯N hydrogen bonds involving the methanol –OH group and the pyridine N atom. Additional C—H⋯O contacts stack the molecules along the b axis.
Related literature
For the coordination chemistry of molybdenum, see: Arzoumanian (1998). For ligand-exchange reactions of molybdenum complexes, see: Chakravarthy & Chand (2011). For the preparation of the Schiff base, see: El-Bahnasawy & El-Meleigy (1993). For a similar type of complex, see: Jin & Li (2012). For related structures and hydrogen bonding, see: Kurapati et al. (2012).
Experimental
Crystal data
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Data collection: SMART (Bruker, 2002); cell SAINT (Bruker, 2002); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supporting information
10.1107/S1600536813019077/sj5344sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536813019077/sj5344Isup2.hkl
The Schiff-base was prepared according to a literature method (El-Bahnasawy & El-Meleigy, 1993). The title complex was prepared following our previously reported method (Kurapati et al., 2012). Solid [MoO2(acac)2] (0.1 mmol) was added to a hot methanol solution of the Schiff-base (0.1 mmol in 25 mL), and the mixture was heated on water bath for 30 minutes. The resulting bright red solution was slowly cooled to room temperature. After one day, red colored block shaped crystals were collected by filtration (Yield: 82%). One of the these crystals was used for the X-ray structural analysis.
All non-hydrogen atoms were refined using anisotropic thermal parameters. All hydrogen atoms bound to carbon were positioned geometrically and refined using a riding model. The H5 bound of the methanol OH group was located in a difference Fourier map and its coordinates were refined with Ueq = 1.5Ueq (O).
Data collection: SMART (Bruker, 2002); cell
SAINT (Bruker, 2002); data reduction: SAINT (Bruker, 2002); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. ORTEP plot of the title complex with 30% probability ellipsoids and atom-labelling scheme. | |
Fig. 2. A hydrogen-bonded dimer formed through O–H···N hydrogen bonds. | |
Fig. 3. Crystal packing in the title compound viewed along the b axis. |
[Mo(C16H13N3O2)O2(CH4O)] | F(000) = 888 |
Mr = 439.28 | Dx = 1.650 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 6758 reflections |
a = 14.3222 (9) Å | θ = 2.4–26.0° |
b = 8.4083 (5) Å | µ = 0.78 mm−1 |
c = 16.0102 (10) Å | T = 298 K |
β = 113.507 (1)° | Block, red |
V = 1768.03 (19) Å3 | 0.24 × 0.14 × 0.10 mm |
Z = 4 |
Bruker SMART CCD area-detector diffractometer | 3474 independent reflections |
Radiation source: fine-focus sealed tube | 3249 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.026 |
ϕ and ω scans | θmax = 26.0°, θmin = 2.5° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −17→17 |
Tmin = 0.836, Tmax = 0.927 | k = −10→10 |
17656 measured reflections | l = −19→19 |
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)] = 0.026 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.070 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.07 | w = 1/[σ2(Fo2) + (0.0412P)2 + 0.6642P] where P = (Fo2 + 2Fc2)/3 |
3474 reflections | (Δ/σ)max = 0.002 |
239 parameters | Δρmax = 0.31 e Å−3 |
13 restraints | Δρmin = −0.60 e Å−3 |
[Mo(C16H13N3O2)O2(CH4O)] | V = 1768.03 (19) Å3 |
Mr = 439.28 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 14.3222 (9) Å | µ = 0.78 mm−1 |
b = 8.4083 (5) Å | T = 298 K |
c = 16.0102 (10) Å | 0.24 × 0.14 × 0.10 mm |
β = 113.507 (1)° |
Bruker SMART CCD area-detector diffractometer | 3474 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 3249 reflections with I > 2σ(I) |
Tmin = 0.836, Tmax = 0.927 | Rint = 0.026 |
17656 measured reflections |
R[F2 > 2σ(F2)] = 0.026 | 13 restraints |
wR(F2) = 0.070 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.07 | Δρmax = 0.31 e Å−3 |
3474 reflections | Δρmin = −0.60 e Å−3 |
239 parameters |
Experimental. Selected IR data (cm-1): 3443 (νC—H), 1610 (νC=N), 935 and 906 (νcis-MoO2). UV-Vis data (λmax (nm) (103 x E (M-1 cm-1))): 445(5.019), 322(7.519), 272 (9.431). 1H NMR data (δ (p.p.m.) (J (Hz))): 2.507(s, 3H, H1), 6.114 (s, 1H, H3),7.737 (1.6)(d, 2H, H6&H10), 7.390(m, 3H, H7, H8&H9), 3.307 (s, 3H, H17), 7.856 (5.6) (d, 2H, H13&H16), 8.636(s, 2H, H15&H14) and 3.130 (sb, 1H, H5(Mo—OH—Me)). |
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 | ||
Mo1 | 0.897513 (11) | 0.554260 (18) | 0.172801 (12) | 0.03495 (8) | |
O2 | 0.93687 (11) | 0.37519 (17) | 0.14943 (11) | 0.0500 (4) | |
O4 | 0.75394 (10) | 0.49574 (17) | 0.14826 (10) | 0.0395 (3) | |
O3 | 0.99506 (10) | 0.69615 (15) | 0.15438 (11) | 0.0437 (3) | |
O1 | 0.94126 (13) | 0.56206 (17) | 0.28773 (11) | 0.0506 (4) | |
N3 | 0.38179 (14) | 0.4684 (2) | 0.07876 (13) | 0.0473 (4) | |
C12 | 0.58263 (15) | 0.5609 (2) | 0.12426 (13) | 0.0362 (4) | |
C3 | 0.93455 (16) | 0.9600 (2) | 0.14600 (15) | 0.0390 (4) | |
H3 | 0.9517 | 1.0667 | 0.1462 | 0.047* | |
N1 | 0.80704 (11) | 0.78010 (18) | 0.14665 (11) | 0.0353 (3) | |
C4 | 1.00685 (14) | 0.8525 (2) | 0.15157 (13) | 0.0354 (4) | |
N2 | 0.70566 (12) | 0.7596 (2) | 0.13494 (11) | 0.0394 (4) | |
C11 | 0.68677 (14) | 0.6106 (2) | 0.13778 (13) | 0.0354 (4) | |
C2 | 0.83391 (16) | 0.9256 (2) | 0.13986 (14) | 0.0364 (4) | |
C7 | 1.2115 (2) | 1.0610 (3) | 0.10059 (17) | 0.0514 (6) | |
H7 | 1.2177 | 1.1454 | 0.0656 | 0.062* | |
C1 | 0.76117 (19) | 1.0617 (2) | 0.12404 (18) | 0.0496 (6) | |
H1B | 0.7114 | 1.0585 | 0.0624 | 0.074* | |
H1C | 0.7979 | 1.1603 | 0.1344 | 0.074* | |
H1A | 0.7277 | 1.0536 | 0.1652 | 0.074* | |
C5 | 1.10730 (14) | 0.8979 (2) | 0.15241 (13) | 0.0363 (4) | |
C15 | 0.40852 (16) | 0.6216 (3) | 0.08732 (17) | 0.0536 (6) | |
H15 | 0.3579 | 0.6976 | 0.0770 | 0.064* | |
C13 | 0.55630 (15) | 0.4022 (3) | 0.11850 (14) | 0.0414 (4) | |
H13 | 0.6055 | 0.3235 | 0.1296 | 0.050* | |
C6 | 1.11753 (17) | 1.0265 (3) | 0.10187 (15) | 0.0454 (5) | |
H6 | 1.0613 | 1.0892 | 0.0690 | 0.054* | |
C14 | 0.45571 (15) | 0.3623 (3) | 0.09603 (15) | 0.0473 (5) | |
H14 | 0.4388 | 0.2550 | 0.0928 | 0.057* | |
C10 | 1.19297 (16) | 0.8094 (3) | 0.20242 (14) | 0.0440 (5) | |
H10 | 1.1872 | 0.7231 | 0.2364 | 0.053* | |
C8 | 1.29577 (18) | 0.9716 (3) | 0.15064 (16) | 0.0495 (5) | |
H8 | 1.3586 | 0.9951 | 0.1493 | 0.059* | |
C9 | 1.28662 (16) | 0.8474 (3) | 0.20263 (16) | 0.0506 (5) | |
H9 | 1.3438 | 0.7888 | 0.2381 | 0.061* | |
C16 | 0.50678 (16) | 0.6730 (3) | 0.11063 (16) | 0.0509 (5) | |
H16 | 0.5222 | 0.7810 | 0.1172 | 0.061* | |
O5 | 0.81999 (11) | 0.57741 (18) | 0.01232 (11) | 0.0444 (3) | |
C17 | 0.8607 (2) | 0.5129 (4) | −0.0480 (2) | 0.0728 (8) | |
H17B | 0.8160 | 0.5370 | −0.1097 | 0.109* | |
H17A | 0.8670 | 0.3997 | −0.0402 | 0.109* | |
H17C | 0.9265 | 0.5585 | −0.0350 | 0.109* | |
H5 | 0.7536 (14) | 0.568 (4) | −0.010 (3) | 0.109* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Mo1 | 0.02528 (11) | 0.02513 (11) | 0.05026 (13) | −0.00067 (5) | 0.01066 (8) | 0.00289 (6) |
O2 | 0.0398 (8) | 0.0297 (7) | 0.0768 (11) | 0.0036 (6) | 0.0193 (7) | 0.0016 (7) |
O4 | 0.0278 (7) | 0.0312 (7) | 0.0575 (9) | −0.0013 (6) | 0.0150 (6) | 0.0030 (6) |
O3 | 0.0312 (7) | 0.0285 (7) | 0.0707 (10) | −0.0037 (5) | 0.0197 (7) | 0.0010 (6) |
O1 | 0.0405 (9) | 0.0504 (10) | 0.0525 (9) | −0.0017 (6) | 0.0096 (7) | 0.0038 (6) |
N3 | 0.0310 (9) | 0.0614 (12) | 0.0498 (10) | −0.0027 (8) | 0.0164 (8) | −0.0002 (8) |
C12 | 0.0290 (10) | 0.0439 (11) | 0.0356 (10) | −0.0022 (7) | 0.0126 (8) | −0.0015 (7) |
C3 | 0.0393 (11) | 0.0275 (10) | 0.0500 (12) | −0.0047 (7) | 0.0175 (9) | 0.0000 (8) |
N1 | 0.0290 (7) | 0.0305 (8) | 0.0452 (9) | −0.0007 (6) | 0.0136 (7) | −0.0005 (7) |
C4 | 0.0342 (10) | 0.0306 (9) | 0.0378 (9) | −0.0063 (7) | 0.0104 (8) | 0.0001 (7) |
N2 | 0.0298 (8) | 0.0363 (9) | 0.0519 (9) | 0.0001 (7) | 0.0163 (7) | −0.0013 (7) |
C11 | 0.0293 (9) | 0.0371 (10) | 0.0387 (10) | 0.0006 (8) | 0.0121 (8) | 0.0001 (8) |
C2 | 0.0381 (11) | 0.0298 (9) | 0.0395 (10) | 0.0017 (7) | 0.0137 (8) | 0.0000 (7) |
C7 | 0.0553 (15) | 0.0464 (13) | 0.0554 (14) | −0.0179 (10) | 0.0251 (12) | 0.0006 (9) |
C1 | 0.0479 (13) | 0.0327 (11) | 0.0701 (15) | 0.0065 (8) | 0.0256 (12) | 0.0025 (9) |
C5 | 0.0350 (10) | 0.0334 (9) | 0.0385 (10) | −0.0072 (8) | 0.0126 (8) | −0.0039 (8) |
C15 | 0.0347 (11) | 0.0589 (15) | 0.0702 (15) | 0.0054 (10) | 0.0243 (11) | −0.0083 (12) |
C13 | 0.0307 (10) | 0.0430 (11) | 0.0480 (11) | 0.0020 (8) | 0.0131 (8) | 0.0081 (9) |
C6 | 0.0424 (11) | 0.0399 (11) | 0.0491 (12) | −0.0078 (9) | 0.0132 (9) | 0.0037 (9) |
C14 | 0.0333 (10) | 0.0481 (12) | 0.0563 (12) | −0.0049 (9) | 0.0133 (9) | 0.0085 (10) |
C10 | 0.0404 (11) | 0.0413 (11) | 0.0501 (11) | −0.0013 (9) | 0.0179 (9) | 0.0056 (9) |
C8 | 0.0420 (12) | 0.0544 (13) | 0.0581 (14) | −0.0165 (10) | 0.0263 (11) | −0.0135 (10) |
C9 | 0.0374 (11) | 0.0542 (13) | 0.0581 (13) | 0.0001 (9) | 0.0170 (10) | −0.0020 (10) |
C16 | 0.0398 (11) | 0.0454 (12) | 0.0692 (14) | −0.0008 (9) | 0.0235 (10) | −0.0105 (11) |
O5 | 0.0313 (7) | 0.0527 (9) | 0.0481 (8) | 0.0000 (6) | 0.0148 (7) | −0.0050 (6) |
C17 | 0.0484 (15) | 0.110 (2) | 0.0628 (16) | 0.0138 (16) | 0.0250 (13) | −0.0120 (16) |
Mo1—O1 | 1.6920 (17) | C7—H7 | 0.9300 |
Mo1—O2 | 1.7009 (14) | C1—H1B | 0.9600 |
Mo1—O3 | 1.9471 (13) | C1—H1C | 0.9600 |
Mo1—O4 | 1.9950 (13) | C1—H1A | 0.9600 |
Mo1—N1 | 2.2422 (16) | C5—C10 | 1.384 (3) |
Mo1—O5 | 2.3656 (16) | C5—C6 | 1.393 (3) |
O4—C11 | 1.326 (2) | C15—C16 | 1.374 (3) |
O3—C4 | 1.328 (2) | C15—H15 | 0.9300 |
N3—C14 | 1.327 (3) | C13—C14 | 1.380 (3) |
N3—C15 | 1.335 (3) | C13—H13 | 0.9300 |
C12—C13 | 1.380 (3) | C6—H6 | 0.9300 |
C12—C16 | 1.388 (3) | C14—H14 | 0.9300 |
C12—C11 | 1.479 (3) | C10—C9 | 1.377 (3) |
C3—C4 | 1.350 (3) | C10—H10 | 0.9300 |
C3—C2 | 1.435 (3) | C8—C9 | 1.374 (3) |
C3—H3 | 0.9300 | C8—H8 | 0.9300 |
N1—C2 | 1.300 (2) | C9—H9 | 0.9300 |
N1—N2 | 1.399 (2) | C16—H16 | 0.9300 |
C4—C5 | 1.483 (3) | O5—C17 | 1.420 (3) |
N2—C11 | 1.287 (3) | O5—H5 | 0.875 (19) |
C2—C1 | 1.500 (3) | C17—H17B | 0.9600 |
C7—C8 | 1.376 (4) | C17—H17A | 0.9600 |
C7—C6 | 1.385 (3) | C17—H17C | 0.9600 |
O1—Mo1—O2 | 105.20 (8) | C2—C1—H1C | 109.5 |
O1—Mo1—O3 | 99.45 (7) | H1B—C1—H1C | 109.5 |
O2—Mo1—O3 | 100.85 (6) | C2—C1—H1A | 109.5 |
O1—Mo1—O4 | 97.42 (7) | H1B—C1—H1A | 109.5 |
O2—Mo1—O4 | 98.30 (6) | H1C—C1—H1A | 109.5 |
O3—Mo1—O4 | 150.09 (6) | C10—C5—C6 | 118.60 (18) |
O1—Mo1—N1 | 96.08 (7) | C10—C5—C4 | 119.98 (18) |
O2—Mo1—N1 | 157.85 (7) | C6—C5—C4 | 121.40 (18) |
O3—Mo1—N1 | 81.31 (5) | N3—C15—C16 | 123.5 (2) |
O4—Mo1—N1 | 72.46 (6) | N3—C15—H15 | 118.2 |
O1—Mo1—O5 | 171.01 (7) | C16—C15—H15 | 118.2 |
O2—Mo1—O5 | 83.52 (7) | C12—C13—C14 | 118.8 (2) |
O3—Mo1—O5 | 80.76 (6) | C12—C13—H13 | 120.6 |
O4—Mo1—O5 | 78.81 (6) | C14—C13—H13 | 120.6 |
N1—Mo1—O5 | 75.02 (6) | C7—C6—C5 | 120.0 (2) |
C11—O4—Mo1 | 118.97 (12) | C7—C6—H6 | 120.0 |
C4—O3—Mo1 | 136.06 (13) | C5—C6—H6 | 120.0 |
C14—N3—C15 | 117.08 (19) | N3—C14—C13 | 123.6 (2) |
C13—C12—C16 | 118.05 (19) | N3—C14—H14 | 118.2 |
C13—C12—C11 | 121.02 (18) | C13—C14—H14 | 118.2 |
C16—C12—C11 | 120.77 (18) | C9—C10—C5 | 121.0 (2) |
C4—C3—C2 | 126.36 (17) | C9—C10—H10 | 119.5 |
C4—C3—H3 | 116.8 | C5—C10—H10 | 119.5 |
C2—C3—H3 | 116.8 | C9—C8—C7 | 119.6 (2) |
C2—N1—N2 | 115.50 (16) | C9—C8—H8 | 120.2 |
C2—N1—Mo1 | 130.12 (13) | C7—C8—H8 | 120.2 |
N2—N1—Mo1 | 114.37 (11) | C8—C9—C10 | 120.2 (2) |
O3—C4—C3 | 124.06 (18) | C8—C9—H9 | 119.9 |
O3—C4—C5 | 112.98 (17) | C10—C9—H9 | 119.9 |
C3—C4—C5 | 122.94 (17) | C15—C16—C12 | 118.8 (2) |
C11—N2—N1 | 109.67 (15) | C15—C16—H16 | 120.6 |
N2—C11—O4 | 124.17 (17) | C12—C16—H16 | 120.6 |
N2—C11—C12 | 118.91 (17) | C17—O5—Mo1 | 124.42 (15) |
O4—C11—C12 | 116.85 (17) | C17—O5—H5 | 111 (3) |
N1—C2—C3 | 120.44 (17) | Mo1—O5—H5 | 113 (3) |
N1—C2—C1 | 121.57 (19) | O5—C17—H17B | 109.5 |
C3—C2—C1 | 117.98 (17) | O5—C17—H17A | 109.5 |
C8—C7—C6 | 120.6 (2) | H17B—C17—H17A | 109.5 |
C8—C7—H7 | 119.7 | O5—C17—H17C | 109.5 |
C6—C7—H7 | 119.7 | H17B—C17—H17C | 109.5 |
C2—C1—H1B | 109.5 | H17A—C17—H17C | 109.5 |
D—H···A | D—H | H···A | D···A | D—H···A |
O5—H5···N3i | 0.88 (2) | 1.84 (2) | 2.695 (2) | 167 (4) |
C1—H1C···O2ii | 0.96 | 2.63 | 3.554 (3) | 162 |
C3—H3···O2ii | 0.93 | 2.60 | 3.492 (2) | 160 |
C14—H14···O1iii | 0.93 | 2.57 | 3.134 (3) | 119 |
C8—H8···O1iv | 0.93 | 2.69 | 3.574 (3) | 159 |
C7—H7···O5v | 0.93 | 2.60 | 3.473 (3) | 157 |
Symmetry codes: (i) −x+1, −y+1, −z; (ii) x, y+1, z; (iii) −x+3/2, y−1/2, −z+1/2; (iv) −x+5/2, y+1/2, −z+1/2; (v) −x+2, −y+2, −z. |
D—H···A | D—H | H···A | D···A | D—H···A |
O5—H5···N3i | 0.875 (19) | 1.84 (2) | 2.695 (2) | 167 (4) |
C1—H1C···O2ii | 0.96 | 2.63 | 3.554 (3) | 162 |
C3—H3···O2ii | 0.93 | 2.60 | 3.492 (2) | 160 |
C14—H14···O1iii | 0.93 | 2.57 | 3.134 (3) | 119 |
C8—H8···O1iv | 0.93 | 2.69 | 3.574 (3) | 159 |
C7—H7···O5v | 0.93 | 2.60 | 3.473 (3) | 157 |
Symmetry codes: (i) −x+1, −y+1, −z; (ii) x, y+1, z; (iii) −x+3/2, y−1/2, −z+1/2; (iv) −x+5/2, y+1/2, −z+1/2; (v) −x+2, −y+2, −z. |
Acknowledgements
I thank Professor Samudranil Pal, School of Chemistry, University of Hyderabad, for his guidance and encouragement throughout this work. The National X-ray Diffractometer facility set up at the University of Hyderabad by the Department of Science and Technology, Government of India, is gratefully acknowledged. I also thank the CSIR, New Delhi, India for providing a research fellowship.
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The coordination chemistry of cis-dioxomolybdenum complexes has acquired significant interest due to their catalytic ability in various organic oxidation reactions (Arzoumanian, 1998). The title complex described here was synthesized as part of our investigation into ligand exchange reactions of [MoO2(acac)2] with various Schiff-bases derived from acid hydrazides (Chakravarthy & Chand, 2011). In the present work we have used the Schiff base (E)-N'-((Z)-4-hydroxy-4-phenylphenylbut-3-en-2-ylidene)isonicotinohydrazide. In the title complex, the doubly deprotonated Schiff-base is coordinated to the molybdenum atom of a cis-[MoO2]+2 core, in a meridional fashion. The distorted octahedral NO5 coordination sphere around the molybdenum atom comprises two cis oxo groups, the ONO donor atoms of the pincer like Schiff base ligand and the O-atom of a neutral methanol molecule. The shortening of the Mo1—O1, 1.6923 (17)Å, bond distance compared to Mo1—O2, 1.7010 (14)Å, is perhaps due to the shift of the molybdenum atom from the (ONO)O square plane made up of the donor atoms of the deprotonated Schiff-base (O3,N1&O4) and O2. The Mo1 atom is displaced by 0.335 (1) Å towards O1. The Mo1–O5, 2.3649 (17) Å, and Mo1—N1, 2.2421 (16) Å, bonds are significantly longer than Mo1—O3, 1.9470 (13) Å, and Mo1—O4, 1.9951 (13) Å, which may be associated with the trans effect imposed by the two oxo groups. In the complex the Schiff-base is planar apart from the phenyl ring of benzoylacetone fragment which makes a dihedral angle of 36.93 (6)° with the best fit plane through the remaining non-hydrogen atoms of the Schiff base ligand.
In solid state, charge assisted intermolecular hydrogen bonding involving of methanol-OH (O5) and the pyridine-N (N3) (O—H···N) leads to formation of discrete dimeric units of the title complex (Fig.2). As a result of our investigation for other short contacts in the crystal lattice, we found five types of C—H···O contacts. In the C—H···O interactions, the H···A distances lie in the range 2.57–2.63 Å, Table 1 and together with the O—H···N hydrogen bond stack the molecules along the b axis.