Synthesis, molecular structure, spectroscopic characterization and antibacterial activity of the Co(III) (chlorido)(pyridine) and (chlorido)(4,4′-bipyridine) “picket fence” porphyrin complexes

Synthesis, molecular structure, photophysical properties and spectroscopic characterization of new 1D-magnesium(II) porphyrin-based coordination polymer

“…4). In general, values of this dihedral angle in several 4,4′-bpy complexes range between 24° and 46° [10,21,46,47].…”

“…However, the Mg-Nax distance for {[Mg(tn-OEP)(4,4'-bpy) 2 ]} n polymer is found to be little shorter with 2.259 and 2.272 Å values [22]. In comparison with other polymeric (bpy)-cobalt porphyrin complexes, the Mg-Nax (bpy) distances is around ~2.311-2.342 Å [10]. The four Mg-Np bonds consist of two sets of equal length 2.062 and 2.069 Å as exists in the opposite pairs and fall on the range [2.063 -2.100 Å] of other reported Mg(II)-porphyrins ( Table 2).…”

“…Synthesis and functionalization of porphyrins and associating metal complexes have long been of great interest in the chemistry community because of their remarkable applications such as catalysis [1][2][3], solar cells [4], chemical sensors [5], building blocks of assemblies [6] and so forth. Porphyrins were reported to exhibit a variety of biological activities [7][8][9][10][11], notably several derivatives based on this molecule had been developed as excellent photosensitive agents of photodynamic therapy (PDT) in clinical applications [12][13][14]. During the past decade, numerous porphyrinic coordination polymers have been designed by using different methods [15][16][17][18][19], especially based on the axial coordination to the metal of a metalloporphyrin through the nitrogen atoms of a bidentate ligand [20].…”

Effect of the coordination of π-acceptor 4-cyanopyridine ligand on the structural and electronic properties ofmeso-tetra(para-methoxy) andmeso-tetra(para-chlorophenyl) porphyrin cobalt(ii) coordination compounds. Application in the catalytic degradation of methylene blue dye

“…5 The proton NMR spectroscopy is a very convenient technique to determine if a cobalt metalloporphyrin is a diamagnetic cobalt(III) complex or a paramagnetic cobalt(II) coordination compound with the 3d 6 and 3d 7 ground state electronic congurations of the Co(III) and the Co(II) cations, respectively. 20 For cobalt(III) meso-porphyrin derivatives, the b-pyrrolic and the phenyl ring protons are slightly shied compared to those of the corresponding free base porphyrins with a chemical shi values in the range [8.5; 9] ppm and between 8.5 and 7.5 ppm for the phenyl protons (Table 1). However, the cobalt(II) meso-arylporphyrins present 1 H NMR spectra more downeld shied, with chemical shi values of the b-pyrrole protons between 12 and 16.5 ppm and d values of the phenyl protons in the range [13; 8.5] ppm (Table 1).…”

“…These electronic properties of cobaltous complexes is the principal reason why Co(II) porphyrin complexes are increasingly investigated and their application elds are becoming wider. 7,20 In continuation of our investigations on metalloporphyrins, we report herein the preparation and the characterization of two cobaltous porphyrin complexes involving the 4-cyanopyridine (4-CNpy) N-donor axial ligand and the two meso-porphyrins with either the phenyl para-substituted methoxy group or chlorine atom, namely the meso-tetra(para-methoxyphenyl)porphyrin (H 2 TMPP) and the meso-tetra(para-chlorophenyl)porphyrin (H 2 TClPP). The principal goal of this work is to study the electronic and the structural effects when the 4-cyanopyridine axial ligand, known to have a very important p-acceptor character, reacts with the two starting material tetracoordinated cobaltous complexes with a meso-porphyrinato para-substituted with a good donor OMe group (TMPP porphyrinato) and with a mesoporphyrinato para-substituted with the acceptor chlorine atom (TClPP moiety).…”