77342-07-5

Basic information

• Product Name: Co(NC₅H₅)2(SO₃C₆H₄)4C₂₀H₈N₄^(3-)
• CAS NO: 77342-07-5
• Molecular Weight: 1146.15
• Mol File: 77342-07-5.mol

Chemical Properties

• CAS DataBase Reference: Co(NC₅H₅)2(SO₃C₆H₄)4C₂₀H₈N₄^(3-)(CAS DataBase Reference)
• NIST Chemistry Reference: Co(NC₅H₅)2(SO₃C₆H₄)4C₂₀H₈N₄^(3-)(77342-07-5)
• EPA Substance Registry System: Co(NC₅H₅)2(SO₃C₆H₄)4C₂₀H₈N₄^(3-)(77342-07-5)

Safety Data

• Hazardous Substances Data: 77342-07-5(Hazardous Substances Data)

Upstream product

• 77342-06-4 Co(H₂O)NC₅H₅(SO₃C₆H₄)4C₂₀H₈N₄^(3-) 

Relevant articles and documents

Kinetic and equilibrium study of the reaction of (meso-tetrakis(p-sulfonatophenyl)porphyrinato)diaquocobaltate(III) with pyridine in aqueous solution

The reaction of pyridine (py) with (meso-tetrakis(p-sulfonatophenyl)porphyrinato)diaquocobaltate(III) (Co(TPPS)(H2O)23-) has been investigated between pH 2 and 13 at μ= 1.00 M (NaClO4). Scheme I best depicts the reactions deduced to be important. The values of all of the parameters in Scheme I were determined and are reported. The k1py path is second 7 order with k1py = (9.56 ± 0.30) × 102 M-1 s-1 at 25°C and the values of the activation parameters are ΔH*1 = 17.6 ± 0.4 kcal/mol and ΔS*1 = 14.4 ± 1.3 cal/(deg mol). These parameters imply dissociative (d) activation. The k4py path is second order with k4py = (1.22 ± 0.12) × 106 M-1 s-1 at 25°C, and the values of the activation parameters are ΔH*4 = 11.5 ± 0.5 kcal/mol and Δ*4 = 6.4 ± 1.6 cal/(deg mol). The parameters imply d activation and the OH- ligand has labilized the Co(TPPS)(OH)H2O4- by a factor of 103 compared to Co(TPPS)(H2O)23-. The k2py path has a pseudo-first-order rate law with the pseudo-first-order rate constant kobsd = (E[py] + FG)/(G + [pyl]) at pH 13. This is interpreted to imply a dissociative (D) mechanism. The parameter E represents the first-order rate constant for formation of the 5-coordinate intermediate and has a value of (1.57 ± 0.13) × 103 s-1 at 25°C. The values of ΔH*7 and ΔS*7 are 11.6 ± 3.1 kcal/mol and -5.1 ± 10.1 cal/(deg mol). The values of Ka1, Ka2, and Ka1py at 25°C are (9.4 ± 0.6) × 10-8, (1.7 ± 0.2) × 10-10, and (5.6 ± 0.2) × 10-10 M, respectively. The values of K1py, K2py, K4py, K5py, and K6py at 25°C are (9.1 ± 0.9) × 108 M-1, (1.2 ± 0.1) × 105 M-1, (5.4 ± 0.8) × 106 M-1, (1.3 ± 0.2) × 102, and 3.4 ± 0.7, respectively. In summary, the kinetic and equilibrium properties of Co(TPPS)(H2O)23- are very similar to those of (meso-tetrakis(4-N-methylpyridyl)-porphyrin)diaquocobalt(III) and (meso-tetrakis(4-carboxyphenyl)porphyrinato)diaquocobaltate(III). However there are some significant differences.