CRYSTAL AND MOLECULAR-STRUCTURE AND ELECTRONIC-PROPERTIES OF [CU(HBIP)(BIP)(ONO2)] (HBIP=3,3-BIS(2-IMIDAZOLYL)PROPIONIC ACID)

The crystal and molecular structure of the complex [Cu(HBIP)(BIP)ONO2] (HBIP = 3,3-bis(2-imidazolyl)propionic acid) has been determined by X -ray methods. It crystallises in the monoclinic space group C2/c, Z = 4, a = 11.350(2), b = 13.156(2), c = 14.225(2) Angstrom, beta = 95.36( 2)degrees, V = 2114.8(6) Angstrom(3). The CuN4O chromophore could be c onsidered as an intermediate between the trigonal bipyramid (TBP) and square pyramid (SP). Neighbouring molecules of the complex are bound b y very strong hydrogen bonds, as short as 2.478 Angstrom, between COO- and COOH groups. Electronic and EPR spectra are consistent with the c rystallographic data.