Tridentate N3 capping coordination behaviour of potentially multi-site coordinating cyclotriphosphazenes: synthesis and spectroscopic studies of 2,2-spiro(1,3-propanediamino)-4,4,6,6-tetrakis(3,5-dimethylpyrazolyl)cyclotriphosphazene, 2,2-diamino-4,4,6,6-tetrakis(3,5-dimethylpyrazolyl)-cyclotriphosphazene and their mononuclear complexes; X-ray structure of ATPCTP·CoCl2

Autor: Kannan Vivekanandan, Edward R. T. Tiekink, Selvarajan Nagendran, K. Rajapandian Justin Thomas, Vadapalli Chandrasekhar, Savariraj Kingsley, G.Thangavelu Senthil Andavan
Rok vydání: 1999
Předmět:
Zdroj: Inorganica Chimica Acta. 286:127-133
ISSN: 0020-1693
DOI: 10.1016/s0020-1693(98)00387-9
Popis: Two new potentially multi-site coordinating cyclophosphazenes, gem-N3P3[HN(CH2)3NH](3,5-Me2Pz)4 (STPCTP) and gem-N3P3(NH2)2(3,5-Me2Pz)4 (ATPCTP) have been synthesised and characterised. These form mononuclear complexes with Cu(II), Co(II) and Ni(II) halides which have been studied by optical spectroscopy. An X-ray analysis of ATPCTP·CoCl2 shows the Co(II) atom to exist in a distorted trigonal bipyramidal geometry in which the two chloride atoms and a nitrogen atom of the cyclophosphazene ring form the equatorial plane; the axial positions are occupied by nitrogen atoms derived from the two non-geminal pyrazolyl substituents. The amino substituents on the cyclophosphazene ring do not take part in coordination.
Databáze: OpenAIRE
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