title: Chromogenic indicator for anion reporting based on an N-substituted oxoporphyrinogen.
abstract: 5,10,15,20-Tetrakis-3,5-di-tert-butyl-4-oxocyclohexadienylidene porphyrinogen and its di-N-benzylated derivative are solvatochromic dyes capable of binding anionic species. The influence of solvent polarity and hydrogen bonding on their electronic absorption spectra was observed. Hydrogen bonding by the porphyrinogen amine protons of acetone solvent molecules could be observed in the solid state. The acetone solvate of N21N23-dibenzyl-5,10,15,20-tetrakis-3,5-di-tert-butyl-4-oxocyclohexadienylidene porphyrinogen crystallized under anhydrous conditions in the space group P with cell dimensions a = 12.1693(11) A, b = 17.5849(13) A, c = 21.0965(17) A, alpha = 69.870(4) degrees , beta = 78.140(4) degrees , gamma = 82.865(5) degrees . These porphyrinogens are capable of binding a variety of anions and can be used to distinguish fluoride chromogenically from the other halide anions. Solvatochromism was combined with anion binding in an attempt to provide more selective tests for anions. The anion binding properties were investigated using UV/vis spectrophotometry and 1H NMR spectroscopy.
authors.affiliation: International Center for Young Scientists, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. Jonathan.Hill@nims.go.jp
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Hill
authors.forename: Amy Lea
authors.initials: AL
authors.lastname: Schumacher
authors.forename: Francis
authors.initials: F
authors.lastname: D'Souza
authors.forename: Jan
authors.initials: J
authors.lastname: Labuta
authors.forename: Carl
authors.initials: C
authors.lastname: Redshaw
authors.forename: Mark R J
authors.initials: MR
authors.lastname: Elsegood
authors.forename: Masaru
authors.initials: M
authors.lastname: Aoyagi
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakanishi
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Ariga