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The title compounds [R 2 NH 2 ][C 2 O 4 SnMe 3 ](R= i -Bu, Cy), in which tin atoms adopt a distorted trigonal bipyramidal configuration, have been prepared and submitted to an X-ray diffraction study. These compounds have been obtained from the reaction of (Cy 2 NH 2 ) 2 C 2 O 4 ·H 2 O or ( i -Bu 2 NH 2 ) 2 C 2 O 4  with SnMe 3 Cl. In both [R 2 NH 2 ][C 2 O 4 SnMe 3 ] compounds, the trans complex has an almost regular trigonal bipyramidal geometry around the tin atom. The SnMe 3  residues are connected as a chain with bridging oxalate anions in a  trans -SnC 3 O 2  framework, the oxygen atoms being in axial positions. The cations connect linear adjacent chains through NH…O hydrogen bonds giving layered structures.

Crystal and molecular structure of diorganoammonium oxalatotrimethylstannate, [R 2 NH 2 ][Me 3 Sn(C 2 O 4 )] (R= i -Bu, cyclohexyl)