Abstract
Nickel dipicolinate complexes (HQ)2[NiL2]·5H2O (1) and (H5AQ)2[NiL2]·4H2O (2) (where L=pyridine-2,6-dicarboxylate anion, Q=quinoline, 5AQ=5-aminoquinoline) are synthesized in solution and also through solvent free cation exchange reactions of H2[NiL2]·3H2O. The crystal structures of the complexes 1 and 2 are determined. The strong π–π interactions between the quinolinium cations disrupt the conventional π-stacking interactions of the nickel–dipicolinate anions. The quinolinium cations of these complexes exchanges with alkali metal cations in basic medium and only at an extreme acidic condition the pyridine-2,6-dicarboxylate can be replaced from these complexes by halide ions.
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