Syntheses and crystal structures of dialkyltin complexes of 3,5-dinitrosalicylic acid

Abstract Three dialkyltin 3,5-dinitrosalicylates, [3,5-(NO 2 ) 2 -2-OC 6 H 2 COO]SnR 2 [R = Me ( 1 ), Et ( 2 ), n -Bu ( 3 )], have been synthesized by the reaction of dialkyltin dichloride with 3,5-dinitrosalicylic acid in the presence of sodium ethoxide and characterized by NMR spectroscopy and X-ray single crystal diffraction. 1 ⋅DMSO, 2 ⋅DMSO, and 3 ⋅DMSO crystallized from DMSO solvent are centrosymmetric dimers containing a four-membered Sn 2 O 2 ring formed by μ -carboxylate O atom bridging two tin atoms (Sn–O–Sn). 1 ⋅C 2 H 5 OH and 2 obtained from C 2 H 5 OH solution have polymeric (one- or two-dimensional) structures generated by bidentate bridging coordination of carboxyl to tin atoms (Sn–O–C–O–Sn). In these complexes, 3,5-dinitrosalicylate as a dianionic ligand adopts chelating-bridging mode to coordinate to tin atom, and tin atom displays a distorted octahedral coordination geometry in which two alkyl groups occupy trans positions and four O atoms are almost in the same plane.