Tin ll Fluoride Covalent Bonding and Polymeric Structure

The r+/r ratio Sn /F of 0.7I4 suggests an octahedral coordination of tin is possible (limits 0.4I4 r+/r 0.732) and that the crystal structure of Snp2 would have the rutile structure if it were ionic [65]. However, tin being above lead in group 14 of the Periodic Table, it is more electronegative than lead, therefore it is a weaker metal, thus it has a higher 

Fluorite-type unit cell (Reproduced from Ref. 64.) 

Projection of the structures of (a) BaFa, (b) BaSnF/u and (c) BaCIF (Reproduced from Ref. 51.) 

3 The a- PbSnp4 Structure The Unexpected Combination of Ionic Bonding and Covalent Bonding 

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