The first square-planar copper(II) 1:2 complex with differently coordinated 2-hydroxybenzaldehyde 4-allylthiosemicarbazone ligands.

The title compound, [(Z)-4-allyl-2-(2-hydroxybenzylidene)thiosemicarbazide-κS][(E)-4-allyl-1-(2-oxidobenzylidene)thiosemicarbazidato-κ(3)O,N(1),S]copper(II) monohydrate, [Cu(C(11)H(11)N(3)OS)(C(11)H(13)N(3)OS)]·H(2)O, crystallized as a rotational twin in the monoclinic crystal system (space group Cc) with two formula unit (Z' = 2) in the asymmetric unit, one of which contains an allyl substituent disordered over two positions. The Cu(II) atom exhibits a distorted square-planar geometry involving two differently coordinated thiosemicarbazone ligands. One ligand is bonded to the Cu(II) atom in a tridentate manner via the phenolate O, azomethine N and thioamide S atoms, while the other coordinates in a monodentate manner via the S atom only.

trans-Bis[(1-ammonio-pentane-1,1-di-yl)diphospho-nato-κO,O']diaqua-copper(II).

In the title compound, [Cu(C(5)H(14)NO(6)P(2))(2)(H(2)O)(2)], the Cu(II) atom occupies a special position on an inversion centre. It exhibits a distorted octa-hedral coordination environment consisting of two O,O'-bidentate (1-ammonio-pentane-1,1-di-yl)diphospho-nate anions in the equatorial plane and two trans water mol-ecules located in axial positions. The ligand mol-ecules are coordinated to the Cu(II) atom in their zwitterionic form via two O atoms from different phospho-nate groups, creating two six-membered chelate rings with a screw-boat conformation.

[1-(2-Oxidobenzyl-idene)-4-phenyl-thio-semicarbazidato-κO,N,S](pyridine-κN)copper(II).

In the structure of the title compound, [Cu(C(14)H(11)N(3)OS)(C(5)H(5)N)], the Cu(II) atom exhibits a slightly distorted square-planar CuN(2)OS coordination polyhedron consisting of a phenyl O, an azomethine N and a thio-amide S atom from the tridentate thio-semicarbazonate dianion, and the N atom of a pyridine mol-ecule. The thio-semicarbazonate ligand exists in the thiol tautomeric form as an E isomer. Rotational disorder of the pyridine and phenyl rings in a 1:1 ratio of the respective components is observed.

Bis[(1-ammonio-ethane-1,1-di-yl)diphospho-nato-κO,O']diaqua-nickel(II) nona-hydrate.

The title compound, [Ni(C(2)H(8)NO(6)P(2))(2)(H(2)O)(2)]·9H(2)O, exhibits a slightly distorted octa-hedral coordination environment around the Ni(II) atom. It contains two mol-ecules of 1-amino--ethyl-idenediphospho-nic acid in the zwitterionic form, coord-inated via O atoms from two phospho-nate groups and creating two six-membered chelate rings. Two water mol-ecules in cis positions complete the coordination environment of the Ni(II) atom.

Bis(1-ammonio-ethane-1,1-diyl-diphos-phonato-κO,O')diaqua-cobalt(II) nona-hydrate.

In the title compound, [Co(C(2)H(8)NO(6)P(2))(2)(H(2)O)(2)]·9H(2)O, the Co(II) atom has a slightly distorted octa-hedral coordination environment consisting of four deprotonated phospho-nate O atoms of two independent 1-amino-ethyl-idendiphospho-nate anions and complemented by the O atoms of two water mol-ecules in cis positions. The anions exists in the zwitterionic form (protonated amino group and two deprotonated phospho-nate O atoms) and constitute two six-membered chelate rings. The crystal structure also contains nine partly disordered uncoordinated water mol-ecules, which create an extensive three-dimensional network of strong O-H⋯O and N-H⋯O hydrogen bonds.

cis-(Pyridin-2-ylcarbonimidodithio-ato-κS,S')bis-(triphenyl-phosphane-κP)palladium(II).

The title compound, [Pd(C(6)H(4)N(2)S(2))(C(18)H(15)P)(2)], was obtained as a minor product from the reaction of trans-PdCl(2)(PPh(3))(2) with piperazine-1,4-dicarbothioic acid bis-(pyridin-2-yl)amide. The Pd(II) atom displays a slightly distorted square-planar PdP(2)S(2) geometry with a bidentately coordinated pyridin-2-ylcarbonimidodithio-ate ligand and two triphenyl-phosphine mol-ecules, coordinated in cis positions. The crystal structure features weak π-π [centroid-centroid distance =3.

Poly[[μ(2)-(1Z,N'E)-2-(1,3-benzothia-zol-2-ylsulfan-yl)-N'-(2-oxidobenzyl-idene-κO:O)acetohydrazidato-κO,N'](pyridine-κN)copper(II)].

In the title compound, [Cu(C(16)H(11)N(3)O(2)S(2))(C(5)H(5)N)](n), the Cu(II) atom displays a square-pyramidal CuN(2)O(3) coordination geometry with strong elongation in the vertex direction. The hydrazone mol-ecule is coordinated to the Cu(II) atom in a tridentate manner in the enolic form, creating five- and six-membered chelate metallarings. The pyridine mol-ecule completes the square-planar base of the copper coordination environment.