Spectroscopic, crystallographic and thermal characterizations of monospiro(N/N)cyclotriphosphazenes with 9-ethyl-3-carbazolyl pendant arm

The Cl replacement reactions of hexachlorocyclotriphosphazene (trimer, N3P3Cl6) with carbazole-substituted diamine ligands (4-6) led to the formation of monospiro(N/N)cyclotriphosphazenes containing 9-ethyl-3-carbazolyl pendant arm (7-9). The structures of these compounds were clarified using spectral (FTIR, ESI-MS, C-13, H-1 and P-31- NMR) and crystallographic data. The crystallographic data indicate that the N3P3 rings of all the phosphazene derivatives have a pseudo mirror plane. In addition, the thermal properties of the phosphazene derivatives were also presented. All the synthesized cyclotriphosphazene derivatives exhibit high thermal stability. (C) 2019 Elsevier B.V. All rights reserved.