Solvent-Induced Structural Diversity and Magnetic Research of Two Cobalt(II) Complexes

[Image: see text] The solvent-induced topological and structural diversities of two Co(II) complexes, namely, [Co(L)(2)(SCN)(2)] (Co1) and [Co(2)(L)(2)(SCN)(OAc)(3)] (Co2) (L = 8-methoxyquinoline), were comparatively analyzed. Certain proportions of L, Co(OAc)(2)·4H(2)O, and NaSCN were mixed and dissolved in CH(3)OH at 60 °C to obtain complex Co1. Complex Co2, an asymmetric dinuclear compound, was obtained by simply replacing CH(3)OH with CH(3)CN as the solvent. The Co(II) ion in complex Co1 was coordinated by the N(4)O(2) mode provided by two L ligands and two SCN(–) anions. The two Co(II) ions in Co2 were in the N(2)O(4) and NO(5) coordination environment and were linked by two μ(2)-OAc(–) bridges and one rare μ(3)-OAc(–) bridge. Weak interaction analysis revealed that complexes Co1 and Co2 exhibited 6-connected shp and 14-connected fcu nets, respectively. Magnetic studies showed that Co1 demonstrated single-ion magnet behavior under 2000 Oe. These behaviors are indicative of clearly field-induced single-ion magnetic behavior with U(eff) = 34.7(2) K and τ(0) = 2.7(2) × 10(–7) s under 2000 Oe dc field, respectively. By contrast, Co2 lacked frequency dependence under zero-field conditions. Electrospray ionization mass spectrometry indicated that two complexes were stable in N,N-dimethylformamide.