Synthesis, Spectroscopy Studies, and Theoretical Calculations of New Fluorescent Probes Based on Pyrazole Containing Porphyrins for Zn(II), Cd(II), and Hg(II) Optical Detection
摘要:
New pyrazole porphyrin conjugates were successfully prepared from a reaction of beta-porphyrin chalcone derivatives with phenylhydrazine in acetic acid followed by an oxidative step. This fast and efficient synthetic approach provided the expected compounds in yields up to 82%. The sensing ability of the new porphyrin-pyrazole derivatives to detect the metal ions Ag+, Na+, K+, Mg2+, Ca2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Pb2+, and Cr3+ was studied by spectrophotometric and spectrofluorimetric titrations. In the presence of Zn2+, the conjugates exhibit changes in the emission spectra that are desired for a ratiometric-type fluoroionophoric detection probe. The studies were extended to gas phase, where the pyrazole porphyrin conjugates show ability to sense metal ions with high selectivity toward Cu2+ and Ag+, and in poly(methyl methacrylate) doped films with promising results for Zn2+ detection.
Synthesis, Spectroscopy Studies, and Theoretical Calculations of New Fluorescent Probes Based on Pyrazole Containing Porphyrins for Zn(II), Cd(II), and Hg(II) Optical Detection
摘要:
New pyrazole porphyrin conjugates were successfully prepared from a reaction of beta-porphyrin chalcone derivatives with phenylhydrazine in acetic acid followed by an oxidative step. This fast and efficient synthetic approach provided the expected compounds in yields up to 82%. The sensing ability of the new porphyrin-pyrazole derivatives to detect the metal ions Ag+, Na+, K+, Mg2+, Ca2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Pb2+, and Cr3+ was studied by spectrophotometric and spectrofluorimetric titrations. In the presence of Zn2+, the conjugates exhibit changes in the emission spectra that are desired for a ratiometric-type fluoroionophoric detection probe. The studies were extended to gas phase, where the pyrazole porphyrin conjugates show ability to sense metal ions with high selectivity toward Cu2+ and Ag+, and in poly(methyl methacrylate) doped films with promising results for Zn2+ detection.
Porphyrins and Their Derivatives: XXIII. Reaction of Formylporphyrins with Weak CH Acids
作者:Yu. V. Ishkov、Z. I. Zhilina、L. P. Bardai、S. V. Vodzinskii
DOI:10.1023/b:rujo.0000034986.64795.8f
日期:2004.3
beta-Formylporphyrin iminium salts generated in situ are more reactive than the initial aldehydes in condensation with ketones having an a-methylene group. A convenient modification of the Claisen-Schimdt reaction has been developed, which makes it possible to involve hydrophobic beta-formyltetraphenylporphyrin in the condensation with acetone, 1,4-diacetylbenzene, 2-acetylthiophene, acetylacetone, and acetophenone to obtain beta-substituted tetraphenylporphyrins of the general formula PorphCH=CR'COCR.
Porphins and their derivatives: XXIV. meso-Tetraphenylporphyrins with β-pyrazole rings
作者:Yu. V. Ishkov、Z. I. Zhilina、A. V. Mazepa、S. V. Vodzinskii、L. P. Bardai
DOI:10.1134/s1070428006080021
日期:2006.8
A series of 5-substituted 2-(2-phenyl-3,4-dihydro-2H-pyrazol-3-yl)porphyrins was prepared by treating with phenylhydrazine tetraphenylporphyrin derivatives containing in the beta-position fragments of beta-unsaturated ketones or aldehydes. The compounds obtained were oxidized. with o-chloranil into the corresponding pyrazolylporphyrins.