X-Ray crystal structure of the complex of 15-crown-5 (1,4,7,10,13-pentaoxacyclopentadecane) with diaquatetrachlorotin(IV) at 120 K

Abstract

The crystal structure of the complex formed between SnCl₄(H₂O)₂ and 15-crown-5 has been determined from X-ray diffractometer data by Patterson and Fourier methods. Crystals are monoclinic, space group P2₁/n, with Z= 4 in a unit cell of dimensions a= 15.985(3), b= 12.512(4), c= 9.869(1)Å, and β= 107.37(1)°. The structure, which was refined to R= 0.0441 for 3 771 observed reflections, consists of octahedral SnCl₄(H₂O)₂ units linked by bifurcated hydrogen bonds from the water molecules to the 15-crown-5 molecules to form polymeric arrays. The water molecules are trans to each other. This, the first report of a trans arrangement (the cis configuration being that found hitherto), is relevant to the interpretation of Mössbauer data.