Copper, a chemical Janus: two copper(II) complexes with different ligand in one single crystal

A chemical Janus, binuclear copper(II) complexes, {[Cu(TPA) Cl][Cu(BPA)Cl]} (ClO4)(2) (TPA = Tris(2-pyridylmethyl) amine, BPA = bis-(2-pyridylmethyl)am ine) containing two different ligands has been synthesized and characterize d by X-ray single crystal analysis. Crystal data: triclinic, space group P1 , a = 12.529(3), b = 12.655(3), c = 13.458(3) Angstrom, alpha = 70.48(3), b eta = 67.40(3), gamma =75.81(3)degrees, D-x = 1.648 mg m(-3), and Z = 2. Th e molecular structure shows that the binuclear copper complex consists of t wo positive cation and two perchlorate anions. The positive cations moietie s have different ligands. Cu(1) is coordinated by four nitrogen atoms from TPA and one chloride atom, forming a square-pyramidal geometry, whereas the coordinate number of Cu(2) is four, three of which are from BPA, one from chloride. There are two weak bonds between the Cl(2a) ion and the Cu(2) ion (2.844 Angstrom) and the distance of Cu(2)= O(13) is 2.750(9) Angstrom.