Syntheses and structures of heterometallic complexes M-Co(II) (M = Li(I), Mg(II), and Eu(III)) with anions of 2-naphthoic acid. An influence of the heterometal on the structure of the complex

A series of polynuclear heterometallic cobalt(II) 2-naphthoate complexes with lithium(I), magnesium(II), and europium(III) is synthesized: [(2,2′-Bipy)2Li2Co2(Naph)6], [(2,4-Lut)2Co2Mg(Naph)6], and [(2,2′-Bipy)2(EtOH)2Co2Eu2(Naph)10] (Naph is 2-naphthoic acid anion, 2,2′-Bipy is 2,2′-bipyridine, and 2,4-Lut is 2,4-lutidine). The single crystals of the synthesized compounds are characterized by X-ray diffraction analysis (CIF files CCDC 1401987 (I), 1401988 (II), 1401989 (III), and 1401990 (IV)). The compositions and structures of the molecular heterometallic complexes based on cobalt(II) cations and anions of 2-naphthoic acid are determined by the radius and coordination number of the introduced heterometal: the isomorphic substitution of one of the cobalt(II) ions is observed for the magnesium(II) complex, and tetranuclear complexes are formed in the case of lithium(I) and europium(III).