SELF-ASSEMBLY OF A CHIRAL PHOSPHINEGOLD(I) BUILDING-BLOCK INTO A 2-DIMENSIONAL NETSHEET BASED ON A HYDROGEN-BOND BETWEEN ONE CL- ANION AND 3 HYDROXY-GROUPS, COORDINATION AND AUROPHILICITY INTERACTIONS

The trigold(I) complex [{Au(mbpa)}(3)S]Cl 2 [mbpa = methyl oxy-3-(diph enylphosphino)-alpha-D-altropyranoside] has been obtained from the com pound [Au(mpba)Cl] land L-cysteine. Complex 2 crystallizes in space gr oup P6(6) with a = 15.165(2), c = 18.897(3) Angstrom and Z = 2, R = 0. 030, R' = 0.050. The crystal structure shows that the Au3S core is a p erfect trigonal pyramid with angles Au-S-Au and P-Au-S of 88.7 and 179 .6 degrees, respectively, and that the chiral building blocks [{Au(mpb a)}(3)S](+) assemble through triple hydrogen bonding between one hydro gen-bond acceptor, Cl-, and three hydrogen-bond donors [Cl ... O(2) 3. 017(10) Angstrom], and form infinite two-dimensional netsheets. The ne tsheets align in the same direction. A relativistic interaction of the d(10) closed shell of gold(I) was revealed by NMR studies. Complex 2 displays a strong bright white emission at 495 nm when excited at 303 nm at room temperature, where the lowest-energy transition is of metal -to-ligand charge-transfer (Au-->S) type.