Crystal Structure and Magnetic Properties of a Linear Trinuclear Ni(II) Complex

Abstract

Abstract Linear Trinuclear Nickel(II) Complex, Super-Exchange Interactions, Antiferromagnetic Coupling [Ni3(C2H32(CH3O)2L2] [L = 13-bis(5-chlorosalicylideneamino)propan-2-ol dianion, (C2H3O2)- = acetate, (CH3OH) = methanol] was synthesized and its crystal structure was determined. It crystallizes in the monoclinic spaceeroup P21 /n with a = 12.694(2), b = 13.281 (4), c = 15.420(3) Å, β = 111.25(2)°, V = 2422.9(9) Å3 ,Z = 2 . The molecule is a "linear" trinuclear complex with nearly octahedral coordination of each nickel ion. Adjacent nickel(II) ions are bridged by the phenolic oxygen atoms of the ligands and the oxygen atoms of the acetato ligands. The coordination sphere of the terminal nickel(II) ions is completed by the oxygen atom of the methanol. Adjacent nickel(II) centers are separated by 3.043(1) Å and weakly antiferromagnetically coupled (J1 = -3 .4 cm-1). The terminal nickel(II) centers are separated by 6.086(1) Å and very weakly antiferromagnetically coupled (J2 = -0 .3 cm-1) which follows from temperature-dependent magnetic susceptibility measurements in the temperature range 4.5 to 318 K. The magnetic moment rises from 2.99 μB at 4.5 K to 5.42 μB at 318 K. In the X(T) curve no characteristic maximum was observed.