Hon Wee Wong

2-[(4-Methyl­benzo­yl)hydrazono]­propionic acid monohydrate

In the title compound, C11H12N2O3·H2O, the water molecule is a hydrogen-bond donor to the double-bond amide and the carbonyl O atoms of two acid molecules; it is also a hydrogen-bond acceptor to the acid –OH and amide –NH– groups. These hydrogen-bonding interactions give rise to a layer structure, with the layers parallel to the ab plane.

Poly[μ-aqua-aqua-{μ-6-eth-oxy-2-[(2-isonicotinoylhydrazinyl-idene)meth-yl]phenolato-κO,N,O'}dioxidosodium-vanadate(V)].

The VV atom in the polymeric title compound, [NaV(C15H13N3O3)O2(H2O)2]n, is O,N,O′-chelated by the Schiff base dianion and is five-coordinated in a trigonal–bipramidal coordination geometry. The oxide O atoms occupy the equatorial sites and one oxide O atom is connected to the NaI atom. The ligand simultaneously O,O′-chelates to the water-coordinated NaI atom; its coordination number is seven owing to an Na⋯Npyridyl bond. The two independent formula units, which are disposed about a false center of inversion, are connected into a layer. Adjacent layers are consolidated into a three-dimensional network by O—H⋯O and O—H⋯N hydrogen bonds.

2-[(4-Chloro-benzo-yl)-hydrazono]-propionic acid monohydrate.

In the title compound, C10H9ClN2O3·H2O, the water molecule is a hydrogen-bond donor to the amide and carbonyl O atoms of two acid molecules; it is also a hydrogen-bond acceptor to the acid OH group and the amide H atom. The hydrogen-bonding interactions give rise to a two-dimensional array.

Bis(μ-methano-lato-κO:O)bis-{[4-bromo-N'-(1-methyl-3-oxidobut-2-en-1-yl-idene-κO)benzohydrazidato-κN',O]oxido-vanadium(V)}.

The dinuclear compound, [V2(C12H11BrN2O2)2(CH3O)2O2], lies on a center of inversion. The doubly-deprotonated Schiff base O,N,O′-chelates to the VV atom; two metal atoms are bridged by the methoxide units. The coordination geometry is a distorted octahedron. Weak intermolecular C—H⋯N hydrogen bonding is present in the crystal structure. The bromophenyl unit is disordered over two positions, with the major component being in a 0.909 (6) proportion.

(Acetyl­acetone 3-hy­droxy-2-naphtho­yl­hydrazonato-κ3O,N′,O′)(methoxo-κO)oxidovanadate(V)

The tridentate Schiff base ligand in the title compound, [V(C16H14N2O3)(CH3O)O], has its O, N and O′ atoms spanning three basal positions of the square-based-pyrimidally VV atom. The fourth basal site is occupied by a methoxo ligand, which results from a deprotonated methanol solvent molecule, and the oxido ligand occupies the apical position. The hydroxy H atom forms an intramolecular O—H⋯N hydrogen bond with an N-atom acceptor site.

(Acetyl­acetone isonicotinoylhydrazonato-κ3O,N′,O′)dioxidovanadate(V) monohydrate

The hydrazone anion in the title compound, [V(C11H12N3O2)O2]·H2O, is zwitterionic as its pyridyl N atom is protonated; the O, N and O′ atoms span the axial–equatorial–axial positions of the trigonal-bipyramidal coordination polyhedron of the metal atom. All non-H atoms lie on a crystallographic mirror plane apart from the oxide ligands, which are related by mirror symmetry. The pyridinium N atom acts as a hydrogen-bond donor to the solvent water molecule, which is in turn a hydrogen-bond donor to the both oxide ligands. These hydrogen-bonding interactions give rise to a three-dimensional network motif.

(4-Chloro-benzohydrazidato-κN',O)[2-(4-chloro-benzoyl-hydrazinyl-idene-κN,O)-3-phenyl-propionato(2-)-κO]oxidovanadium(V) methanol monosolvate.

The VV atom in the title compound, [V(C7H6ClN2O)(C16H11ClN2O3)O]·CH3OH, is N,O-chelated by the benzoylhydrazidate anion and O,N,O′-chelated by the (benzoylhydrazinylidene)propionate dianion. The distorted octahedral trans-N2O4 coordination geometry is completed by the vanadyl O atom. The mononuclear and solvent molecules are linked by N—H⋯O and O—H⋯O hydrogen bonds about a center of inversion, generating a dimer.

(Benzohydrazidato-κ2N′,O)­[2-(benzoyl­hydrazono-κ2N,O)propion­ato-κO]oxido­vanadium(V)

The VV atom in the title compound, [VO(C7H7N2O)(C10H8N2O3)], is N,O-chelated by the benzohydrazidate anion and O,N,O′-chelated by the 2-(benzoylhydrazono)propionate dianion. The distorted octahedral trans-N2O4 coordination geometry is completed by the vandadyl O atom. Molecules are linked by N—H⋯O hydrogen bonds into a supramolecular chain structure parallel to [010].

(4-Chloro­benzohydrazidato-κ2N′,O)[2-(4-chloro­benzoyl­hydrazono-κ2N,O)propionato(2−)-κO]oxidovanadium(V)

In the crystal structure of the title compound, [VO(C7H6ClN2O)(C10H7ClN2O3)], the VV atom is N,O-chelated by the chlorobenzoylhydrazidate anion and O,N,O′-chelated by the (chlorobenzoylhydrazono)propionate dianion. The distorted octahedral trans-N2O4 coordination geometry is completed by the vanadyl O atom. In the crystal, molecules are linked by N—H⋯O hydrogen bonds into a linear chain parallel to [010].

(4-Methyl-benzohydrazidato-κN',O)[2-(4-methyl-benzoyl-hydrazinyl-idene-κN,O)-3-phenyl-propionato(2-)]oxido-vanadium(V) methanol monosolvate.

The VV atom in the title compound, [V(C8H9N2O)(C17H14N2O3)O]·CH3OH, is N,O-chelated by the benzoylhydrazidate anion and O,N,O′-chelated by the (benzoylhydrazono)propionate dianion. The octahedral trans-N2O4 coordination geometry is completed by the vanadyl O atom. Two mononuclear complexes and two solvent molecules are linked by O—H⋯O and O—H⋯N hydrogen bonds, generating a centrosymmetric aggregate.