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Phosphorus-nitrogen compounds: Part 15. Synthesis, anisochronism and the relationship between crystallographic and spectral data of monotopic spiro-crypta phosphazenes

  • Nuran Asmafiliz
  • , Elif Ece İlter
  • , Zeynel Kiliç
  • , Tuncer Hökelek
  • , Ertan Şahes
  • Ankara University
  • Ataturk University

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The reactions of hexachlorocyclotriphosphazatriene, N 3 P 3 Cl 6 , with N 2 O 2 -donor type coronands, Ph2[OR 1 O][CH 2 NHR 2 NHCH 2 ] [R 1 = (CH 2 ) 3 , R 2 = (CH 2 ) 3 (1), R 1 = (CH 2 ) 3 , R 2 = (CH 2 ) 4 (2), R 1 = (CH 2 ) 4 , R 2 = (CH 2 ) 4 (3)], give monotopic spiro-crypta phosphazene architectures, N 3 P 3 Cl 4 {Ph 2 [OR 1 O][CH 2 NR 2 NCH 2 ]) [R 1 = (CH 2 ) 3 , R 2 = (CH 2 ) 3 (4), R 1 = (CH 2 ) 3 , R 2 = (CH 2 ) 4 (5) and R 1 = (CH 2 ) 4 , R 2 = (CH 2 ) 4 (6)], respectively. The reaction of 4 with excess pyrrolidine leads to the formation of geminal N 3 P 3 Cl 2 (C 5 H 5 N) 2 {Ph 2 [O(CH 2 ) 3 O] [CH 2 N(CH 2 ) 3 NCH 2 ]} (7). The 31 P-NMR spectra of 5 and 6 indicate that these compounds have anisochronism. The structures of 5, 6 and 7 were investigated by X-ray crystallography. For 7, the sums of the bond angles around the N atoms were 348·6(2)° and 349·7(2)° indicating that the N atoms have pyramidal configurations and are stereogenic. The relationship between the chemical shift values δP (spiro) and the Δ(P-N) (electron density transfer parameters) of 4, 5, 6, 7 and the analogous compounds as well as the relationship between the Δ(δP) values and the above mentioned Δ(P-N) are presented respectively. In addition, the relationship between the endocyclic NPN bond angles of these compounds and the 31 P-NMR chemical shifts of the spiro-phosphorus atoms were investigated. The spectroscopic and structural investigations of the compounds were made by elemental analyses, MS, FTIR, one-dimensional 1 H-, 13 C-, 31 P-NMR, DEPT and two-dimensional COSY, HETCOR, HMBC, homo- and heteronuclear correlation techniques.

Original languageEnglish
Pages (from-to)363-376
Number of pages14
JournalJournal of Chemical Sciences
Volume120
Issue number4
DOIs
Publication statusPublished - Jul 2008

Keywords

  • Anisochrony
  • Spectroscopy
  • Spiro-crypta-phosphazenes
  • Synthesis

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