Multi-site coordination ligands assembled on organostannoxane supports

The reactions of bis(pyrazol-1-yl) acetic acid LCOOH (1) (L = (Pz)2CH–) and bis(3,5-dimethylpyrazol-1-yl)acetic acid L′COOH (2) (L = (3,5-Me2Pz)2CH–) with organotin oxide (hydroxide) precursors, n-BuSn(O)(OH), n-Bu2SnO, (n-Bu3Sn)2O and (Ph3Sn)2O has led to the isolation of several organotin compounds containing bispyrazolyl unit(s) on the periphery of the stannoxane structure [n-BuSn(O)O2CL]6 (3), [n-BuSn(O)O2CL′]6 (4), [n-Bu3SnO2CL]n (5), [n-Bu3SnO2CL′]n (6), [Ph3SnO2CL]n (7), [Ph3SnO2CL′]n (8), [{n-Bu2SnO2CL}2O]2 (9) and [{n-Bu2SnO2CL′}2O]2 (10). Compounds 5, 7, 9 and 10 have been structurally characterized by X-ray crystallography. In the solid state, these compounds possess interesting 3-D and 2-D supramolecular networks as a result of intermolecular C–H⋯O, C–H⋯N, C–H⋯Cl and C–H⋯π interactions.

The reactions of bis(pyrazol-1-yl) acetic acid LCOOH (1) (L = (Pz)2CH–) and bis(3,5-dimethylpyrazol-1-yl)acetic acid L′COOH (2) (L = (3,5-Me2Pz)2CH–) with organotin oxide (hydroxide) precursors, n-BuSn(O)(OH), n-Bu2SnO, (n-Bu3Sn)2O and (Ph3Sn)2O has led to the isolation of several organostannoxanes which are decorated in their periphery by the bispyrazolyl unit(s).Figure optionsDownload as PowerPoint slide