Synthesis, structure and spectroscopic properties of CuL(MeOH), H₂L = (E)-N ¹-(2-((2-aminocyclohexydiimino)(phenyl)methyl)-4-chlorophenyl)-N ²-(2-benzyl-4-chlorophenyl)oxalamide

Abstract

A new kind of copper(II) complex, CuL(MeOH) (H 2 L ¼ (E)-N 1 -(2-((2-aminocyclohexydiimino)(phenyl)methyl)-4-chlorophenyl)-N 2 -(2-benzyl-4-chlorophenyl)oxalamide) has been synthesized and its structure determined by single-crystal X-ray methods. Copper(II) ion is five-coordinate, bonding to four nitrogen atoms from H 2 L and one oxygen atom from MeOH. Hydrogen bonds in the crystal result in the formation of a one-dimensional structure. EPR spectra are discussed. Computer simulation gave g || ¼ 2.200, g ? ¼ 2.002. On the basis of the synthesis and the crystal structure, the mechanism of the metal template reaction involved in the formation of the complex was verified.

Two new oxamido-bridged trinuclear complexes [Cu2M] (M = Mn(II), Co(II)): synthesis, structures, and magnetic properties

“…Macrocyclic cores have a great advantage over the corresponding acyclic ones: they can be thermodynamically stabilized and kinetically retarded toward metal dissociation and substitution by the so-called macrocyclic effect [24][25][26][27]; on the other hand, the oxamido group, in which an exo-cis conformation of the oxygen donors is enforced, providing the opportunity to allow direct communication between adjacent metal ions, is a well-known efficient bridging mediator of magnetic exchange [28,29]. With the above points in mind and continuing our long-term interest on macrocyclic polynuclear complexes [30][31][32][33][34][35][36], in the present work, by using the macrocyclic oxamido-copper complex CuL (H 2 L = 2,3dioxo-5,6:13,14-dibenzo-9,10-(O)cyclohexyl-1,4,8,11-tetraazacyclo-tetradeca-7,12-diene) as precursor, we intend to assemble polymetallic systems. Our first attempts resulted in the isolation of two new trinuclear complexes with the formulas [(CuL) 2 Mn(ClO 4 ) 2 ] (1) and [(CuL) 2 Co (ClO 4 ) 2 ] (2).…”