Novel Coumarin-Substituted Cyclophosphazene as a Fluorescent Probe for Highly Selective Detection of 2,4,6-Trinitrophenol.

Nitroaromatic compounds (NACs) such as 2,4,6-trinitrophenol (TNP), commonly known as picric acid (PA), hold widespread application in industries such as dyestuff production, wood preservation, explosives manufacturing, insect control, and photographic development. In this study, the organic-inorganic hybrid 4,4',4″,4‴,4″″,4‴″-((1,3,5,2λ5,4λ5,6λ5-triazatriphosphinine-2,2,4,4,6,6-hexayl)hexakis(oxy))hexakis(2-chromen-2-one) () was synthesized via the nucleophilic substitution reaction of 4-hydroxycoumarin (4-HC) with hexachlorocyclotriphosphazene (HCCP). The structure of Cpz-4-HC was fully characterized by Fourier transform infrared (FT-IR), H-, C-, and P NMR, and HRMS.

Synthesis, structure, redox, NLO and DNA interaction aspects of [((L'-'")2RuII)3(mu3-L)]3+ and [(L')2RuII(NC5H4S-)]+[L3- = 1,3,5-triazine-2,4,6-trithiolato, L'-'" = arylazopyridine].

The trinuclear complexes [(L'-'")2RuII)3(mu3-L)](ClO4)3, [1] (ClO4)3-[3](ClO4)3 (L = trianionic form of 1,3,5-triazine-2,4,6-trithiol; N(p)C(5)H(4)N=N(a)-C6H4(R), R = H (L'), m-Me (L"), p-Me (L'")) and the analogous mononuclear complex [(L')2RuII(NC5H4S-)]ClO4 [4] ClO4 were synthesized. Crystal structures of [1](ClO4)3 and [4]ClO4 were determined. [1](3+)-[3](3+) exhibit three successive oxidative couples corresponding to Ru(II)Ru(II)Ru(III)<==>Ru(II)Ru(II)Ru(II); Ru(II)Ru(III)Ru(III)<==>Ru(II)Ru(II)Ru(III); Ru(III)Ru(III)Ru(III)<==>Ru(II)Ru(III)Ru(III) where the mixed valent states are moderately coupled.