POLYOL METAL-COMPLEXES .8. R,R-TRANS-DIAMINOCYCLOHEXANE-KN,N'-METHYL-BETA-D-XYLOPYRANOSID-2,3-ATO-KO2,O3 AQUA COPPER DIHYDRATE, [(R,R-CHXN)(H2O)CU(ME-BETA-D-XYLP2,3H-2)].2H2O, A COPPER COMPLEX WITH A TWOFOLD DEPROTONATED XYLOSE DERIVATIVE AS A LIGAND

Methyl beta-D-xylopyranoside forms a chelate complex with copper(II) ions in aqueous, alkaline solution after deprotonation at O-2 and O-3. In the blue crystals, Cu(II) is further coordinated by R,R-trans-1,2-diaminocyclohexane and water; P2(1), a = 982.9(3), b = 705.8(5), c = 1292.1(6) pm, beta = 96.74(4)-degrees, V = 890.2(8) . 10(6) pm3. The alkoxide-O-atoms act as acceptors in a hydrogen bond system, a typical feature of which is a homodromic helix of water molecules.