Synthesis of Palladium and Nickel Complexes with Octaphenyltetraazaporphyrins

Acid-base interaction of octaaryltetraazaporphyrin complexes in a proton-donor medium

“…The H 2 SO 4 acidity function for the concentration range under study is unknown, so we determined the concentration dependence of acidity constants of 8 . For all the studied complexes this dependence is linear with the slope equal to 1, which allows us an assumption on the formation in the studied H 2 SO 4 concentration range of the complexes monoprotonated at the meso-nitrogen atom.…”

“…We studied basicity of the complexes (Cl)Co 3+ TAP· (C 6 H 5 ) 8 , (Cl)Co 3+ TAP(C 6 H 4 Br) 8 , and (Cl)Co 3+ TAP· (C 6 H 4 NO 2 ) 8 in the CH 3 COOH-H 2 SO 4 medium in the H 2 SO 4 concentration range from 0.14 to 0.89 M. Figure 3 shows as an example the changes in the electron absorption spectra of (Cl)Co 3+ TAP(C 6 H 4 NO 2 ) 8 in this environment. As seen, only one absorption band that suffered a red shift increased in intensity.…”

“…The Pd 2+ complex with octaphenyltetraazaporphyrin (VII) was prepared by the method [8]. 0.1 g of octaphenyltetraazaporphyrin and 0.19 g of PdCl 2 (molar ratio 1:10) were dissolved in 40 ml of DMF, the mixture was heated to boiling, boiled for 30 minutes, then another 0.19 g of PdCl 2 was added and the boiling was continued for 30 min.…”

“…The Pd 2+ complex with octa(p-bromophenyl)tetraazaporphyrin (VIII) was prepared by the method [8]. 0.1 g of octa(p-bromophenyl)tetraazaporphyrin and 0.23 g of PdCl 2 (molar ratio 1:20) were dissolved in 20 ml of DMF, heated to boiling, boiled for 10 min, cooled, poured into water, filtered, washed with water, dried, and chromatographed on silica gel (eluent chloroform), and then reprecipitated from methanol.…”

“…Octa(p-bromophenyl)tetraazaporphyrin and octa(pnitrophenyl)tetraazaporphyrin were prepared along the procedures in [8,9].…”