COPPER COORDINATION POLYMERS WITH INFINITE CHLORIDE-ION CHANNELS AND DIFFERENT DIRECTIONS OF THE JAHN-TELLER DISTORTION, BUILT FROM TRIS(1,2,4-TRIAZOLYL)BORATE AS A MODIFIED TRIS(PYRAZOLYL)BORATE LIGAND

[Co{HB(C2H2N3)(3)}(2)] reacts with an excess of CuCl2 in hot water wit h formation of (2)(infinity)[Cu2Cl2{mu(3)-HB(C2H2N3)(3)}(2) . 2 H2O] ( 7) or (infinity){[Cu-2{mu(4)-HB(C2H2N3)(3)}(mu-OH)(2)]Cl . 6 H2O} (8), depending on the reaction time. 8 can also be obtained from [Cu{HB(C2 H2N3)(3)}(2)] and CuCl2 in aqueous ammonia. The 2-D double-layer-type coordination polymer 7 crystallizes in the orthorhombic space group P2 (1)2(1)2(1). The two different Cu(II) centers in the lattice are disti nguished only be the direction of the Jahn-Teller distortion. The foll owing corresponding distances for the CuClN5 coordination sphere were found Cu1/Cu2-Cl = 2.572(2)/2.328(2), Cu1/Cu2-N = 2.585(5)/2.077(4); 2 .000(4)/1.979(5); 2.100(5)/2.734(5); 2.005(4)/1.994(4); 2.024(5)/2.369 (5). In the 3-D coordination polymer 8 one of the two different Cu cen ters is chelated by the three endodentate nitrogen donors, while the o ther Cu center is coordinated by three exodentate nitrogen atoms. The coordination sphere is completed in both cases by two hydroxo bridges to symmetry-related Cu centers. The metal-Ligand connectivity creates infinite channels with helical walls which contain the solvated chlori de anions.