Synthesis, Structure and Stability of Binuclear Metal Complexes with Macrocyclic Ligand

Abstract

Abstract: The macrocyclic ligand(L) and its dinuclear copper(Ⅱ) and zinc(Ⅱ) complexes have been synthesized. The crystal structure of [Cu 2L(Him)₂](ClO₄)₄·2H₂O has been determined by single crystal X-ray diffraction. It crystallizes in a monoclinic system, the space group P₂ 1/c, a=0.9512(2) nm, b=2.0104(4) nm, c=1.2025(2) nm, β-=98.89(3)°, V=2.2719(8) nm³, Z=2, D_c=1.599 Mg/m³, F(000) = 876, R=0.0591, wR=0.1733, GOF(F)=1.009. The copper(Ⅱ) atom is five coordinated with four nitrogen atoms of the macrocyclic ligand and one nitrogen atom of imidazole. The stepwise stability constants of the 1∶1 and 2∶1 molar ratios of Cu to Land Zn to Lcomplexes were determined by potentiometric titration in KCl supporting electrolyte(0.100 mol/L) at 25 ℃. The results indicated that zinc(Ⅱ) ion can form hydroxide bridged dinuclear complex [Zn₂(OH)L]³⁺, while the copper(Ⅱ) ion can only form dinuclear complex [Cu₂L]³⁺ with macrocyclic ligand.

Key words: Macrocyclic dinuclear copper(Ⅱ) and zinc(Ⅱ) complexes, Crystal structure, Coordination stability

CLC Number:

O614

TrendMD:

CHEN Shi, LU Tong-Bu, FENG Xiao-Long, LI Yan-Wu, MAO Zong-Wan, JI Liang-Nian . Synthesis, Structure and Stability of Binuclear Metal Complexes with Macrocyclic Ligand[J]. Chem. J. Chinese Universities, 2002, 23(6): 1004.

References

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