Synthesis and crystal structure of a two-dimensional Co coordination polymer: poly[(μ-3-carb-oxy-benzoato)[μ-5-(pyridin-4-yl)-1,2'-3,3'-bi[1,2,4-triazole]]cobalt(II)].

In the title compound, [Co(CHO)(CHN)] , the divalent Co atom is six-coordinated to three N atoms from two symmetrical 5-(pyridin-4-yl)-1,2'-3,3'-bi[1,2,4-triazole] (Hpyttz) ligands and three O atoms from three symmetrical 3-carb-oxy-benzoate (Hbdic) ligands, leading to a distorted {CoNO} octa-hedral coordination environment. Two Co cations are linked by four bridging carboxyl-ate groups to generate a dinuclear [Co(CO)] unit. The dinuclear units are further connected into a chain along [010] the Hbdic ligands.

1,4-Bis{[hydroxy(phenyl)phosphoryl]methyl}piperazine-1,4-diium tetrachloridocadmate(II) dihydrate and the cobaltate(II) analogue.

The reaction of aminophosphinic acid with CdCl2·2.5H2O or CoCl2·6H2O in concentrated hydrochloric acid yielded the isostructural compounds 1,4-bis{[hydroxy(phenyl)phosphoryl]methyl}piperazine-1,4-diium tetrachloridocadmate(II) dihydrate, (C18H26N2O4P2)[CdCl4]·2H2O, (I), and 1,4-bis{[hydroxy(phenyl)phosphoryl]methyl}piperazine-1,4-diium tetrachloridocobaltate(II) dihydrate, (C18H26N2O4P2)[CoCl4]·2H2O, (II). The asymmetric unit of each contains two half dications, both located on crystallographic centres of inversion, a tetrachloridometallate(II) dianion and two solvent water molecules.

Diaqua-bis-(hydrogen tartrato)cobalt(II) dihydrate.

The title complex, [Co(C(4)H(5)O(6))(2)(H(2)O)(2)]·2H(2)O, contains a Co(II) ion, two single deprotonated tartrate anions, two coordinated water mol-ecules and two lattice water mol-ecules. The coordination geometry of the Co(II) ion is a distorted octa-hedron with two O atoms from two coordinated water mol-ecules occupying cis positions in the equatorial plane and four O atoms from two hydrogen tartrate ions occupying the remaining positions. In the crystal, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into a three-dimensional network.

5-Carb-oxy-2-isopropyl-1H-imidazol-3-ium-4-carboxyl-ate monohydrate.

In the title compound, C(8)H(10)N(2)O(4)·H(2)O, the imidazole N atom is protonated and one of the carboxyl-ate groups is deprotoned, forming a zwitterion. An intra-molecular O-H⋯O hydrogen bond occurs. The crystal structure is stabilized by inter-molecular N-H⋯O and O-H⋯O hydrogen bonds.

Diaqua-bis-(5-carb-oxy-1H-imidazole-4-carboxyl-ato-κN,O)iron(II).

In the title compound, [Fe(C(5)H(3)N(2)O(4))(2)(H(2)O)(2)], the Fe(II) ion lies on an inversion centre and is coordinated by two N and two O atoms from two 5-carb-oxy-1H-imidazole-4-carboxyl-ate ligands and two water mol-ecules in a distorted octa-hedral geometry. An intra-molecular O-H⋯O hydrogen bond occurs. In the crystal, inter-molecular N-H⋯O and O-H⋯O hydrogen bonds form a three-dimensional network, which consolidates the packing.

4-[(3-Oxo-1,3-dihydro-2-benzofuran-1-yl)amino]-benzoic acid.

In the title compound, C(15)H(11)NO(4), the dihedral angle formed by the benzene ring and the essentially planar 2-benzofuran ring system is 55.93 (3)°. In the crystal, inter-molecular O-H⋯O hydrogen bonds link pairs of mol-ecules, generating centrosymmetric R(2) (2)(8) ring motifs.

4-(2-Sulfanyl-idene-1,3-benzothia-zol-3-yl)butan-2-one.

In the title compound, C(11)H(11)NOS(2), the benzine ring is coplanar with the thia-zole ring, making a dihedral angle of 0.81 (1)°. In the crystal, adjacent mol-ecules are connected into a helical chain along the b axis by S⋯S contacts [3.

4-Amino-3-ammonio-benzene-sulfonate.

The title compound, C(6)H(8)N(2)O(3)S, crystallized as a sulfonate-aminium zwitterion. In the crystal, inter-molecular N-H⋯O hydrogen bonds generate an extensive three-dimensional network, which consolidates the packing.