Crystal designing and magneto-chemical characterization of unusual nickel(II) MOFs

Abstract

Here, we have reported crystal designing and magneto-chemical characterization of two new complexes [Ni(3,5-dnba)2(hmp)2] (1) and [Ni3(Py)8(µ-CH3COO)4](I3)2(2) employed by 3,5-dinitro benzoic acid (dnba), 2-Pyridine methanol (hmpH) and pyridine. Complex 1 consists of an unusual NiII octahedral MOF-like monomeric structure, whereas 2 comprises of planar three Ni asymmetric “distorted hexagonal planar” units linked by alternating syn, syn, anti, a (μ-O2CCH3) and syn, syn, (μ-O2CCH3)2 units. Variable-temperature, solid-state magnetic susceptibility studies in the 3.0–300 K temperature range in a 0.33 T (333 Hz) direct-current (dc) magnetic field reveal the paramagnetic and ferromagnetic behavior with calculated ground-state spin (S) values are 1 and 3/2 of complex 1 and 2, respectively. Interesting, complex 2 have weak antiferromagnetic intra-Ni3 exchange couplings. Alternating current magnetic susceptibility studies, both the complex did not belong to the SMM category.