Hong-Mei Chen

Synthesis, Crystal Structure, and Properties of Aquacopper(II) N‐[(1‐Methylimidazole‐2‐yl)‐methylene]‐β‐alaninate Hexafluorophosphate and Copper(II) N‐[(1‐Methylimidazole‐2‐yl)methyl]‐β‐alaninate Perchlorate

Two Cu(II) complexes with polydentate ligands comprising imidazole and β‐alanine groups, N‐[(1‐methylimidazole‐2‐yl)methylene]‐β‐alanine (HL1) and its reduced forms N‐[(1‐methylimidazole‐2‐yl)methyl]‐β‐alanine (HL2), have been synthesized. The crystal structures of aquacopper(II) N‐[(1‐methylimidazole‐2‐yl)methylene]‐β‐alaninate hexafluorophosphate [CuL1(H2O)]PF6 (1) and copper(II) N‐[(1‐methylimidazole‐2‐yl)methyl]‐β‐alaninate perchlorate [CuL2]ClO4 (2) have been characterized by X‐ray crystallography. The copper(II) atom in (1) shows square‐pyramidal geometry and that in (2) shows square‐planar geometry. The carboxyl–CO2 group in both complexes behave in a syn‐anti mode to bridge adjacent copper atoms to form one‐dimensional chain. The electronic and redox properties of (1) and (2) are also discussed.

Tris({2-[(1-methyl­imidazol-2-yl)­methyl­imino]­ethyl}amine)­cobalt(II) diperchlorate

The CoII atom of the title complex, [Co(C21H30N10)](ClO4)2, located on a threefold rotation axis, is coordinated in an octahedral geometry by three imine N atoms and the three imidazole N atoms, with Co—N distance of 2.131 (3)–2.164 (3) A, and cis and trans N—Co—N angles of 76.17 (12)–102.77 (10) and 163.66 (12)°, respectively. The perchlorate counter-anions are located on centers of symmetry.