Synthesis, reactivity and structures of spirocyclic products derived from octachlorocyclotetraphosphazene: comparison with spirocyclic cyclotriphosphazenes and linear phosphazenes

Abstract

The reaction of N 4 P 4 Cl 8 1 with the difunctional reagents 2,2Ј-methylenebis(4,6-di-tert-butylphenol) (as its disodium salt) and N,NЈ-diisopropylpropane-1,3-diamine gave the spirocyclic products 2,2-N 4 P 4 {[

Novel Coumarin Substituted Water Soluble Cyclophosphazenes as “Turn-Off” Type Fluorescence Chemosensors for Detection of Fe3+ ions in Aqueous Media

“…Consistent with the BenesiHildebrand graphs, application of the Method of Continuous Variation resulted in a Job's with a maximum mole fraction for Fe 3+ cations was observed as 0.50 ( Fig. 8c as a n e x a m p l e fo r c o m p o u n d 6 ) , i n d i c a t i n g th a t cyclophosphazene molecules and Fe 3+ ions preferred 1:1 stoichiometry for the formation of complexes between the chemosensor compounds (6)(7)(8)(9) and Fe 3+ cations in aqueous solutions.…”

“…4 as examples for compounds 4, 6 and 8). The fluorescence behaviors were examined in methanol for all studied compounds (4-9) and in both methanol and aqueous solutions for quaternized ionic or zwitterionic compounds (6)(7)(8)(9). All these compounds gave an emission band at 395 nm in methanol (Fig.…”

“…When BR^is the halogen, it can be replaced with ease by alkoxy, aryloxy or amino groups via nucleophilic substitution reactions [1][2][3][4][5][6]. Hexachlorocyclotriphosphazene, trimer, N 3 P 3 Cl 6 , (1) or octachlorocyclotetraphosphazene, tetramer, N 4 P 4 Cl 8 (2) namely cyclophosphazenes are a kind of phosphazene compounds that they show many special characteristics.…”

“…The fluorescence behaviors of these compounds were investigated in methanol and water solutions. The chemosensor properties of the newly synthesized water soluble cyclophosphazene compounds (6)(7)(8)(9) were investigated against to different metal ions and these compounds were found highly selective to Fe 3+ ions in aqueous solution.…”

Formation of novel spiro, spiroansa and dispiroansa derivatives of cyclotetraphosphazene from the reactions of polyfunctional amines with octachlorocyclotetraphosphazatetraene

“…19,20 Although, a large number of octachlorocyclotetraphosphazatetraene (1), N 4 P 4 Cl 8 , with monofunctional amines were prepared and studied, 21-31 discussion on a substitution with polyfunctional amines is relatively limited in the literature. [32][33][34][35][36][37] We report here, the synthesis and structural characterization of six new cyclotetraphosphazene derivatives (scheme 1) and, to the best of our knowledge, there is no report so far of any derivative in this series that has been structurally characterized by any spectral data or x-ray crystallography.…”