Use of liquid-liquid interface (biphasic) for the preparation of benzenetricarboxylate complexes of cobalt and nickel

New metal-organic frameworks (MOFs) [Ni(C12N2H10)- (H2O)][C6H3(COO)(2)(COOH)] (I), [Co-2(H2O)(6)][C6H3(COO)(3)](2)center dot (C4N2H12)(H2O), (II), [Ni-2(H2O)(6)][C6H3(COO)(3)](2)center dot(C4N2H12)-(H2O)(2) (III), [Ni(C13N2H14) (H2O)][C6H3(COO)(2)(COOH)] (IV), Ni-3(H2O)(8)][C6H3(COO)(3)] (V) and [Co(C4N2H4)(H2O)][C6H3- (COO)(3)] (VI) {C6H3(COOH)(3)} 1,10-phenanthroline, C4N2H12 = piperazine dication, C13N2H14 = 1,3-bis(4-pyridyl)propane and C4N2H4 = pyrazine} have been synthesized by using an interface between two immiscible solvents, water and cyclohexanol, The compounds are constructed from the connectivity between the octahedral M2+ (M = Ni, Co) ions coordinated by oxygen atoms of carhoxylate groups and water molecules and/or by nitrogen atoms of the ligand amines and the carboxylate units to form a variety of structures of different. dimensionality. Strong hydrogen bonds of the type O-H center dot center dot center dot O are present in all the compounds, which give rise to supramolecularly organized higher-dimensional structures,, In some cases pi center dot center dot center dot pi interactions are also observed. Magnetic Studies indicate weak ferromagnetic interactions in I, IV and V and weak antiferromagnetic interactions in the other Compounds (II, III and VI). All the compounds have been characterized by a variety of techniques.