Anion exchange in trimethyl- and triphenyltin complexes with chromogenic ligands: solution equilibria and colorimetric anion sensing

Villamil‐Ramos, Raúl; Yatsimirsky, Anatoly K.

doi:10.1002/aoc.1771

Cited by 6 publications

(1 citation statement)

References 39 publications

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“…E-mail: anatoli@unam.mx reported for R 3 SnL (L is a nitrophenolate anion) complexes as chromogenic anion receptors in DMSO and aqueous DMSO. 13 Organotin(IV) complexes also may provide higher affinity. Thus stability constants of diorganotin(IV) complexes with organic phosphates are on average some three orders of magnitude larger than those of copper and zinc.…”

Section: Introductionmentioning

confidence: 99%

Selective fluorometric detection of pyrophosphate by 3-hydroxyflavone-diphenyltin(iv) complex in aqueous micellar medium

Villamil‐Ramos

Barba

Yatsimirsky

2012

Analyst

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3-Hydroxyflavonate-diphenyltin(IV) chloride (Ph(2)Sn(Ofl)Cl) was prepared and characterized structurally by single crystal X-ray diffraction. The compound possesses high fluorescence (λ(max) 464 nm with excitation at 400 nm) in neutral aqueous solutions containing 5 mM cetyltrimethylammonium chloride and does not lose the flavonol ligand even at high dilution. The fluorescence is selectively quenched by pyrophosphate (PPi) (linear range 0-5 μM, detection limit 0.1 μM). Determination of 1 μM PPi tolerates the presence of 100-fold excess of AMP, ADP, inorganic phosphate and acetate, and 10-fold excess of ATP. From concentration profiles of the quenching effect it is concluded that quenching occurs due to formation of the complex (Ph(2)Sn(Ofl))(3)PPi, which is transformed at higher PPi concentrations to a simple 1 : 1 complex Ph(2)Sn(Ofl)(PPi). No flavonol ligand exchange with PPi is observed. A series of related organotin(IV) complexes were prepared in situ by reacting 3-hydroxyflavone with Me(2)SnCl(2), PhSnCl(3) and n-BuSnCl(3). The derivatives of Me(2)SnCl(2) and PhSnCl(3) behave similarly to Ph(2)Sn(Ofl)Cl but with lower sensitivity to PPi. However, the n-butyltin(IV) derivative tentatively of the composition n-BuSn(Ofl)(2) undergoes fluorescence enhancement rather than quenching in the presence of PPi in the μM concentration range. The results of this study demonstrate that the use of metal flavonol complexes as optical sensors for anions is a promising approach.

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Section: Introductionmentioning

confidence: 99%