Compounds with Sn—O—P Linkages

Compounds with Sn-O-P linkages are obtainable from distannoxanes (9.334) as well as by oxidation of stannyl phosphines (9.328). 

The complex SnOCl2 2POCI3 has the ring structure (9.335a) and other phosphoryl and dichlo-rophosphate complexes are also known (4.323) and (5.281). Six-coordinated tin is achieved in the compound (9.335b) which can be compared with the silicon analogue (9.277). 

Dialkyl phosphinic acids form complexes [R2P(0)0H]2 SnC, with tin tetrahalides, which when heated form chain polymers of type. 

Complexes of the type RjSnOPlOXORlj can be prepared by reaction (9.337). These complexes have polymeric chain structures (9.338) and possess valuable fungicidal properties. The phenyl analogue is believed to have a hexameric ring structure —[PhjSn O P(0Ph)20-]6— 

Stannaphosphate anions containing Sn-O-P linkages are found in [H3N(CH2)2NH3]2+ 2[Sn4P30,2]. A 3-D network is built from pyramidal [SnOj] and tetrahedral [POJ units sharing O atoms in common. 

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