150344-70-0Relevant academic research and scientific papers
Imidazolate-bridged Copper(II) Complexes with Infinite Zigzag-chain and Tetranuclear Structures formed by Deprotonation and Self-assembly
Matsumoto, Naohide,Nozaki, Takeshi,Ushio, Hiroyuki,Motoda, Ken-ichiro,Ohba, Masaaki,et al.
, p. 2157 - 2162 (1993)
A method of molecular design of self-assembling metal complexes has been established.The copper(II) complex with a quadridentate ligand 2)>ClO4 undergoes deprotonation of the imidazole proton under basic conditions to give an imidazolate-bridged polymeric compound 2)infinite>, where H2L2 = N-3-ethoxysalicylidene-N'-imidazol-4-ylmethylenecyclohexane-1,2-diamine.The latter compound crystallizes in the monoclinic space group P21/a with a = 15.515(5), b = 9.338(5), c = 12.660(2) Angstroem, β = 95.33(2) deg, and Z = 4, R = 0.078 for 1721 reflections.It has an infinite zigzag-chain structure and the variable-temperature magnetic data are well reproduced using the Ising model based on H = -2ΣJijSiSj with a J value of -1.8 cm-1.The complex 3)Cl>ClO4 with a tridentate ligand gives an imidazolate-bridged tetranuclear complex 3)4>4 on deprotonation at the imidazole nitrogen, where HL3 = N-imidazol-4-ylmethylene-N',N'-dimethylpropane-1,3-diamine.The latter compound crystallizes in the triclinic space group P with a = 15.216(6), b = 15.592(5), c = 15.102(5) Angstroem, α = 104.98(3) deg, β = 108.44(3) deg, γ = 61.12(2) deg, Z = 2, and R = 0.096 for 6931 reflections.The structure consists of a cyclic tetranuclear molecule in which each imidazolate nitrogen atom co-ordinates axially to the copper(II) ion of the adjacent unit.Variable-temperature magnetic data are well reproduced using the Heisenberg model based on H = -2J(S1*S2 + S2*S3 + S3*S4 + S4*S1) with J = -60.0 cm-1.
