An answer to the SPIRO versus ANSA dilemma in cyclophosphazenes. Part XVI. Synthesis and crystal structure of the first SPIRO species from dithiadiamines

Article abstract of DOI:10.1016/0022-2860(92)80213-2

Aminolysis of hexachlorocyclotriphosphazene, N3P3Cl6, by dithiadiamines in suitable conditions yields mono-SPIRO species which constitute new macrocyclic monocyclophosphazenic structures containing sulphur atoms in their loops.Such (S,S) compounds are isologous to previously described oxygenated cyclophosphazenic cages which are commonly capable of inclusion of "hard" metals.Thus, one may expect that (S,S) cages will be useful for inclusion of "soft" metals.The X-ray structure of the (S,S) mono-SPIRO derivative from 3,7-dithianonane-1,9-diamine (coded as SS232) reveals two crystallographically independent molecules in the unit cell, and also shows the conformations of SPIRO loops.