Spectroscopic, Electrochemical, Magnetic and Structural Characterization of an Hexamethylenetetramine Co(II) Porphyrin Complex – Application in the Catalytic Degradation of Vat Yellow 1 dye

CO2 to CO Electroreduction, Electrocatalytic H2 Evolution, and Catalytic Degradation of Organic Dyes Using a Co(II) meso-Tetraarylporphyrin

“…FT-IR ( Figure S1, Supplementary Material ) and UV-vis absorption ( Figure 1 ) and 1 H NMR data ( Figure S2 ) agree with the reported data [ 51 ]. In keeping with the paramagnetic character of the Co(II) d 7 system, we obtained broadened 1 H NMR signals at δ = 15.71 ppm for the β-pyrrole protons and at 12.96 and 9.92 ppm for the phenyl atoms [ 10 , 11 , 26 , 54 , 78 ].…”

“…By variation of the substituents on the phenyl core of the porphyrin ligands, these processes can cover a huge range of potentials [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Moreover, there are one or two axial positions available for binding small molecules [ 10 , 11 , 12 , 26 , 27 , 28 , 29 ]. Both properties make Co porphyrins very suitable for redox catalysis [ 22 , 23 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ].…”

“…Amongst other organic redox transformations, the electrochemically or photochemically initiated decomposition of organic dyes in waste water is another increasingly important research field in recent years [ 5 ]. Recently, Zn(II) [ 12 , 15 , 71 , 72 ] and Co(II) porphyrins [ 10 , 11 , 26 , 73 ] have been used as catalysts in the degradation of organic dyes with H 2 O 2 . In view of the first oxidation potential of Co(TPP) complexes lying in the range of 0.1 to 0.75 V vs. SCE [ 10 , 11 , 13 , 16 , 17 , 22 , 24 , 25 , 26 , 61 , 62 ], their high reactivity in radical-based organic transformations [ 14 , 58 , 59 , 60 ] is not unexpected and a very recent study on a (5,10,15,20-tetrakis(2,5-dimethoxyphenyl)porphyrinato)cobalt(II) has revealed some mechanistic details in such decomposition reactions using H 2 O 2 [ 73 ].…”

“…By variation of the substituents on the phenyl core of the porphyrin ligands, these processes can cover a huge range of potentials [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Moreover, there are one or two axial positions available for binding small molecules [10][11][12][26][27][28][29]. Both properties make Co porphyrins very suitable for redox catalysis [22,23,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44].…”

“…Recently, Zn(II) [12,15,71,72] and Co(II) porphyrins [10,11,26,73] have been used as catalysts in the degradation of organic dyes with H 2 O 2 . In view of the first oxidation potential of Co(TPP) complexes lying in the range of 0.1 to 0.75 V vs. SCE [10,11,13,16,17,22,[24][25][26]61,62], their high reactivity in radicalbased organic transformations [14,[58][59][60] is not unexpected and a very recent study on a (5,10,15,20-tetrakis(2,5-dimethoxyphenyl)porphyrinato)cobalt(II) has revealed some mechanistic details in such decomposition reactions using H 2 O 2 [73].…”