Coordination of nitrogen(II) oxide by metal prophyrins

Coordination and acid-base properties of meso-nitro derivatives of β-octaethylporphyrin

“…5-nitro-2, 3,7,8,12,13,17,18-octaethylporphyrin, 5,15-dinitro-2,3,7,8,12,13,17,18-octaethylporphyrin, 5,10,15-trinitro-2,3,7,8,12,13,17,18-octaethylporphyrin were prepared by the method of Bonnett and Stephenson [41]. 5,10,15,3,7,8,12,13,17,porphyrin was prepared by employing the method of Gong and Dolphin [42]. The polar products crystallize with varying amounts of CHCl 3 and petroleum ether crystallization.…”

“…-dc(H 2 P)/dt = k·c(H 2 P)·c n (MX 2 ) (8) In Equation 8, k is the reaction rate constant, c n (MX 2 ) is the salt concentration, and c(H 2 P) is the porphyrins concentration. In this work, kinetic measurements were performed at 100-fold excess of the salt, Zn(OAc) 2 , with respect to porphyrin; therefore, the effective rate constants kef of the complex formation could be determined by Equation 9;…”

“…Recently, this interest has been expressed in the role of steric crowding of bulky substituents in causing nonplanar macrocyclic distortions and in the connection between tetrapyrrole conformations and their physical, chemical and coordination properties. These nonplanar conformations have been suggested to play a crucial role in the biological functions of tetrapyrroleprotein complexes [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

“…To date, some attempts have been made in this direction. In our previous works it was shown that nonplanar porphyrin macrocyclic distortions have a great influence on the acid-base properties of porphyrinligand and depend on a solvent nature increase or reduce reaction rate of formation of metalloporphyrins within several orders of magnitude [6,8,[22][23][24][25].…”