The complex [ Cu (phen) 2 Cl ( CIO4 ) ]. ( phen = 1,10-phenanthroline) has been synthesized and structurally characterized. It crystallizes in the monoclinic system, space group P21/c with a = 1. 2666(2) nm, b = 1. 1219(2) nm, c = 1. 7225(2) nm, β = 111. 462 ( 8 )°, V = 2.2779 (6) nm^3, wR = 0.071. In the complex, the Cu (Ⅱ) center is coordinated by the N-atoms of two phenanthroline forming two five-membered chelate rings. The copper ion has a slightly distorted square pyramidal configuration with four nitrogen atoms from p...