Syntheses, Crystal Structures, and Magnetic Properties of Two Cobalt(II) Coordination Complexes with 4'-Substituted 3,2':6',3''-Terpyridine Ligands.

Two new cobalt(II) coordination complexes [Co(Phtpy)(HBTC)_0.5]_n·nH₂O (I) and [Co(Meophtpy)(HBTC)_0.5]_n·nH₂O (II) (Phtpy = 4'-(4-phenyl)-3,2':6',3''-terpyridine, Meophtpy = 4'-(4-methoxyphenyl)-3,2':6',3''-terpyridine,H₃BTC = trimesic acid) were synthesized under solvothermal conditions. The structures of complexes I, II have been characterized by elemental analysis, FT-IR, TG analysis, PXRD and single crystal X-ray diffraction techniques (CCDC nos. 2123289 (I) and 2123290 (II)). For complex I, a two-dimensional (2D) layered structure is formed parallel to the bc plane and the adjacent layers are connected by Phtpy ligand along a direction to form a three-dimensional (3D) structure. It is represented as 2-nodal (3, 5)-connected {4.6.8}{4.6⁶.8³} by Schläfli symbol. For complex II, one-dimensional (1D) ladder chains along two almost perpendicular directions are formed and these chains are connected by Meophtpy ligands to form a 3D structure. It is represented as 2-nodal (3, 5)-connected {4².6⁵.8³}{4².6} by Schläfli symbol. In both complexes, dominant antiferromagnetic interactions between Co(II) ions were observed. [ABSTRACT FROM AUTHOR]