Abstract
The crystal structure of Sn[H2PO4]2 has been determined from X-ray diffractometer data by Patterson and Fourier methods. Crystals are monoclinic, space group C2/c, with Z= 4 in a unit cell of dimensions a= 16.561 (9), b= 6.896(2), c= 5.939(2)A, and β= 91.35(4)°. The structure has been refined by least-squares methods to R 0.039 for 1 429 reflections. It consists of [H2PO4]– tetrahedra and Sn2+ ions. Each Sn atom has four O neighbours all lying on one side. Two of the Sn–O bonds are short (2.209 A) and two are longer (2.466 A). Such a co-ordin-ation of Sn is usually described as distorted square pyramidal, with four basal oxygens and the apex occupied by a stereochemically active lone pair of electrons from Sn. The [H2PO4]– groups are linked by strong hydrogen bonds (2.545 and 2.627 A).
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