Abstract A series of 20 complexes of general formula R 3 SnL (R= CH 3, nC 3 H 7, nC 4 H 9, C 6 H 5, cC 6 H 11; L= anion of thiophene 2-, thiophene 2-acetic, furoic 2-and pyrrole 2- carboxylic acids) has been prepared. All of these complexes are monomers except those of triphenyltin (IV) which are polymers and have been characterised by molecular weight determination, IR, 1 H-NMR and 119m Sn Mössbauer studies. Tetrahedral and trigonal ...