SYNTHESIS AND INFRARED AND H-1,C-13, SN-119 NMR-SPECTRA OF SOME TRIS(1-BUTYL)TIN(IV) AND BIS(1-BUTYL)TIN(IV) NAPHTHOATES AND HYDROXYNAPHTHOATES

The synthesis and structure of tris(1-butyl)tin(IV) and bis(1-butyl)ti n(IV) 1-naphthoates, 2-naphthoates, 1-hydroxy-2-naphthoates, 2-hydroxy -1-naphthoates, 3-hydroxy-2-naphthoates as well as the groups of the c orresponding tetrakis(1-butyl)dinaphthoato- and trakis(1-butyl)bis(hyd roxynaphthoato)distannoxanes have been studied in solutions of both co ordinating and noncoordinating solvents by means of infrared and multi nuclear (H-1, C-13 and Sn-119) NMR spectroscopies. In the solutions of noncoordinating solvents, all the tris(1-butyl)tin(IV) compounds are present as isolated monomeric molecules with pseudotetrahedral environ ment of the central tin atom, or as strongly deformed cis-trigonally b ipyramidal chelate complexes with anisobidentate carboxylic group. The bis(1-butyl)tin(IV) compounds form molecular pseudooctahedral complex es with chelate anisobidentate carboxylic groups of naphthoate or hydr oxynaphthoate ligands. The (1-butyl)chlorotin(IV) compounds are molecu lar complexes containing a chelate-bound carboxylic group, their tin a tom having a pentacoordinated environment of the bond partners, The te trakis(1-butyl)dinaphthoato- and raskis(1-butyl)bis(hydroxynaphthoato) distannoxanes form dimeric molecular complexes with two pentacoordinat ed tin atoms and two hexacoordinated ones. In solutions of a coordinat ing solvent (hexadeuteriodimethyl sulfoxide), the tris(1-butyl)tin(IV) compounds form trans-trigonally bipyramidal complexes with one molecu le of the solvent, whereas the bis(1-butyl)tin(IV) and bis(1-butyl)chl orotin(IV) compounds form trapezoidally bipyramidal complexes with two molecules of the solvent. The dimeric trakis(1-butyl)bis(hydroxynapht hoato)distannoxanes are monomerized by coordinating solvent, each mono meric unit adding two solvent molecules per one tin atom. The environm ent of the tin atom is then pseudooctahedral. The hydroxyl groups of n aphthoate systems do not take part in any bonds to the tin atom in any of the compounds studied.