The Crystal and Molecular Structure of 2-Formylpyridine Selenosemicarbazone

Abstract

The structure of 2-formylpyridine selenosemicarbazone, SeN4CTH8, has been determined from threedimensional X-ray photographic data. The crystals are monoclinic, space group P2t/e, with unit-cell dimensions a=9.320, b=6-524 and c= 16-275 ,&, fl=90.53 °. There are four formula units in the cell. The structure was solved by the two-dimensional minimum Patterson function and the heavy atom method. It was refined by a full-matrix least-squares method to a final residual R value of0.11 for 1180 observed reflexions. The Se-C bond length of 1.83 ,~ possesses only partial double-bond character. The molecules are linked by N-H...Se hydrogen bonds to form dimer-like units, which are held together by N-H...N hydrogen bonds.