Multi-site coordination ligands assembled on organostannoxane supports

Abstract

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.