The crystal structure of the title compound has been determined from single-crystal X-ray diffraction data by Patterson and Fourier methods. Crystals are monoclinic, space group C2/c with Z= 4 in a unit cell of dimensions a= 10"422 (8), b = 5.676 (4), c= 13.618 (7) A,, fl= 108"50 (5) °. The structure was refined by least-squares methods to R 0.071 for 1193 reflexions. The oxalates are equivalent and are chelated to Sn through one oxygen on each carbon atom to give one Sn-O bond of 2.25 and one of 2.36 A,. The tin atoms are in distorted pyramidal sites surrounded by two oxygen atoms at 2.25 and two at 2.36 A.
The structure of N-(1,2,3,5-tetramethyl-4-pyrazolio)toluene-p-sulphonamidate has been determined from 2383 significant independent reflexions collected on an automated four-circle diffractometer. The crystals are monoclinic, space group P2~/c, with unit-cell dimensions a = 8.295 (2), b = 13.353 (3), c = 13-759 (3) ,~, /~ = 105-90 (1) °. The structure has been refined by a least-squares method to give an R value of 0.051. The bond lengths in the pyrazole moiety indicate extensive electron delocalization over the whole ring. The exocyclic C-N and N-S distances are 1.396 (3) and 1.558 (2) ,~ respectively. The data are consistent with a dipolar structure containing an essentially positive aromatic pyrazolium ring attached to a negatively charged N atom.
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