Spectrophotometric study of coproporphyrin-I complexes of copper(II) and cobalt(II)

The Use of Spectrophotometry UV-Vis for the Study of Porphyrins

“…For example, the rate of complexation of TMPyP with Cu(II) and Mg(II) was accelerated by L-cysteine (Watanabe & Ohmori 1981) and 8-quinolinol (Makino & Itoh, 1981), respectively. The organic ligands with an extended -electron structure, such as imidazole or bipyridine (Giovannetti et al, 1995;Kawamura et al, 1988;Ishi & Tsuchiai 1987;Tabata & Kajhara, 1989) and L-tryptophan (Tabata & Tanaka, 1988) also show a tendency to accelerate the formation of metalloporphyrins because form intermediate molecular complexes with metal ions and porphyrin reagents. In the presence of tryptophan, the rate of incorporation of Zn(II) to TPPS4 is about 100 times greater than in its absence (Tabata & Tanaka, 1988).…”

Multifunctional Zinc Oxide Promotes Electrochemiluminescence of Porphyrin Aggregates for Ultrasensitive Detection of Copper Ion

“…The detection limit is 0.33 pmol·L –1 ( S / N = 3) (Figure B), which is superior or comparable to previously reported methods for Cu 2+ detection (Table ). The probable mechanisms of the sensitive quenching effect for Cu 2+ can be explained as follows: First, Cu 2+ is captured by l -Cys to form coordinate bonds, even covalent bonds with the nitrogen atoms of porphin rings, and the ECL efficiency of the original system will be reduced due to the formed metalloporphyrins . Second, the different valence states of copper ions may consume a part of the reactive intermediate species of S 2 O 8 2– (i.e., SO 4 •– ), and paramagnetic Cu 2+ will cause the reversible electron transfer and transform the excited singlet state to a triplet state, so the ECL intensity of the system will be quenched effectively by this internal conversion. , …”

“…The probable mechanisms of the sensitive quenching effect for Cu 2+ can be explained as follows: First, Cu 2+ is captured by L-Cys to form coordinate bonds, even covalent bonds with the nitrogen atoms of porphin rings, and the ECL efficiency of the original system will be reduced due to the formed metalloporphyrins. 43 Second, the different valence states of copper ions may consume a part of the reactive intermediate species of S 2 O 8 2− (i.e., SO 4…”

Water soluble porphyrin‐Schiff base ligands and their metal complexes: Synthesis, photophysical, electrochemical, and chemosensor properties

“…[11] The tetrapyrrole cavity of highly conjugated porphyrins can act as a receptor for various metal ions via coordination bond resulting in porphyrin-based colorimetric, spectrophotometric or fluorescent sensors. [12][13][14][15] Porphyrin-based molecular probes can be easily modified at meso-positions with different functional units which can allow the detection of certain analytes. [16] Several modified porphyrin derivatives have been designed for the selective recognition of certain analytes such as cations, anions, and small organic molecules.…”