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Two metal coordination polymers [Ni(oba)(Py 2 TTz) 1.5 (H 2 O)]·2H 2 O·DMF ( 1 ) and [Co(oba)(Py 2 TTz)(H 2 O) 4 ]·2H 2 O ( 2 ) have been synthesized under solvothermal conditions [H 2 oba = 4,4′-oxybis(benzoic acid) and Py 2 TTz = 2,5-di(pyridine-4-yl)thiazolo[5,4- d ]thiazole]. Crystals of compound  1  belong to the orthorhombic system, space group  Ibam , with  a  = 38.928(8),  b  = 7.7113(14),  c  = 28.508(6) Å,  V  = 8558(3) Å 3 ,  Z  = 8. Compound  2  crystallizes in the monoclinic crystal system, space group  C 2/ c , with  a  = 33.816(3),  b  = 6.2697(6),  c  = 13.5821(13) Å,  β  = 96.393(3)°,  V  = 2861.7(5) Å 3 ,  Z  = 4. The oba 2−  dianions link two Ni atoms through unidentate carboxylate moieties in a  μ  1  −  η  1 : η  0  coordination mode. Compound  1  features a three-dimensional (3D) framework structure with Py 2 TTz and oba 2−  ligands. In compound  2 , the central cobalt ion is in an octahedral geometry, which is defined by four oxygen atoms from four different coordinated water molecules and two nitrogen atoms from two different Py 2 TTz ligands. It is noteworthy that the dicarboxylate ligands oba 2−  with four oxygen atoms do not directly coordinate with the cobalt ion, and only act as a counter-anion. The luminescence properties of  1  and  2  were also investigated.

zeitschrift für naturforschung b

Cobalt(II) and nickel(II) complexes based on 2,5-di(pyridine-4-yl)thiazolo[5,4- d ]thiazole and dicarboxylate ligands: synthesis, structures and properties