In the salt, (NH(4))(2)[Co(CH(4)O(6)P(2))(2)(H(2)O)(2)], the methyl-ene-diphospho-nate acts as a bidentate ligand and the Co(II) ion (site symmetry ) assumes an octa-hedral CoO(6) coordination geometry. The acid H atom of the ligand is distributed over two O atoms. In the crystal, a three-dimensional network is formed through O-H⋯O and N-H⋯O hydrogen bonds between the cations and anions.

In the title compound, [Co(NO(3))(2)(C(18)H(16)N(2)O(2))], the Co(II) ion is six-coordinated in a distorted octa-hedral environment defined by two O and two N atoms from the ligand and by two O atoms from two nitrate anions. A two-dimensional network parallel to the ab plane is built up by C-H⋯O hydrogen bonds, which link adjacent mol-ecules in the crystal structure.

In the title hydrated complex, [Co(C(11)H(15)N(2)OS(2))(2)]·H(2)O, the Co(II) atom (site symmetry 2) is coordinated by two O,N,N'-tridentate Schiff base ligands, resulting in a very distorted cis-CoO(2)N(4) octa-hedral geometry for the metal ion. In the crystal, the water mol-ecule (O-atom site symmetry 2) inter-acts with nearby complex mol-ecules by way of bifurcated O-H⋯(O,S) hydrogen bonds.

In the title complex, [Co(C(15)H(9)N(2)O(6))(2)(H(2)O)(4)]·2H(2)O, the Co(II) ion is located on an inversion center and is coordinated by two monodentate 3-carb-oxy-5-[(4-carb-oxy-phen-yl)diazen-yl]benzo-ate ligands and four water mol-ecules in a distorted octa-hedral geometry. In the crystal, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into a three-dimensional supra-molecular netw...

In the centrosymmetric title compound, [Co(C6H12N4O3)2](NO3)2·4H2O, the Co(II) ion, lying on an inversion center, is O,N,O'-chelated by two nitrilo-triacetamide mol-ecules, forming a distorted octa-hedral geometry. In the crystal, extensive O-H⋯O and N-H⋯O hydrogen bonds link the complex cations, nitrate anions and lattice water mol-ecules into a three-dimensional network.

Corn cob as a low cost adsorbent was used in the present work for the removal of toxic heavy metal Co2+ from aqueous solutions. Bath experiments were used to determine the best adsorption conditions. The equilibrium adsorption level was determined as a function of solution pH, temperature (T), contact time (tc), initial adsorbate concentration, and adsorbent dosage. Effective removal of metal i...

Effective and sustainable separation processes for critical metals, especially the physicochemically similar elements nickel cobalt in battery recycling, are of great interest future. Selective adsorption represents a highly potential process this purpose. In publication, silica adsorbent functionalized with an amino-polycarboxylate derivate (HSU331) was investigated regarding selective Ni(II) ...

In the title compound, [Co(C(7)H(5)O(2))(2)(C(14)H(12)N(2))], the Co(II) ion is located on a twofold rotation axis and is chelated by a 2,9-dimethyl-1,10-phenanthroline (dmphen) ligand and two benzoate anions in a distorted octa-hedral geometry. The crystal packing is stabilized by π-π inter-actions between parallel dmphen ligands of neighbouring mol-ecules, with a face-to-face distance of 3.41...

In the title complex, [Co(NCS)(2)(C(10)H(9)N(3)O)(2)(H(2)O)(2)], the Co(II) ion is located on a crystallographic twofold rotation axis and is in a slightly distorted octa-hedral CoN(4)O(2) coordination environment. The dihedral angle between the pyridine and pyrazine rings is 85.86 (10)°. In the crystal structure, inter-molecular O-H⋯N and O-H⋯S hydrogen bonds link complex mol-ecules into a thr...

The asymmetric unit of the title compound, [Co(C(6)H(6)N(2)O)(2)(H(2)O)(4)](C(7)H(5)O(3))(2)·4H(2)O, contains one-half of the complex cation with the Co(II) ion located on an inversion center, a 3-hy-droxy-benzoate counter-anion and two uncoordinated water mol-ecules. Four water O atoms in the equatorial plane around the Co(II) ion [Co-O = 2.0593 (16) and 2.1118 (16) Å] form a slightly distorte...