Solvent effects on the initial and transition states upon solvolysis oftrans-dichlorotetra(4-ethylpyridine)cobalt(III) perchlorate in water+methanol mixtures
IM Sidahmed, AM Ismail - Transition Metal Chemistry, 1987 - Springer
IM Sidahmed, AM Ismail
Transition Metal Chemistry, 1987•SpringerThe solvolysis of trans-[Co (4-Etpy) 4 Cl 2]+(1)(Etpy= ethylpyridine) was investigated in
water and in a wide range of water+ methanol mixtures. The effect of temperature on the
solvolysis was considered and the thermodynamic parameters of activation were calculated.
The free energies of transfer of (1) in the initial state were calculated from the solubility of the
complex [Co (4-Etpy) 4 Cl 2] 2 [ReCl 6]. The free energy of transfer of the cation (1) in the
transition state was calculated using a free energy cycle. The effect of the solvent structure …
water and in a wide range of water+ methanol mixtures. The effect of temperature on the
solvolysis was considered and the thermodynamic parameters of activation were calculated.
The free energies of transfer of (1) in the initial state were calculated from the solubility of the
complex [Co (4-Etpy) 4 Cl 2] 2 [ReCl 6]. The free energy of transfer of the cation (1) in the
transition state was calculated using a free energy cycle. The effect of the solvent structure …
Summary
The solvolysis of trans-[Co(4-Etpy)4Cl2]+ (1) (Etpy=ethylpyridine) was investigated in water and in a wide range of water+methanol mixtures. The effect of temperature on the solvolysis was considered and the thermodynamic parameters of activation were calculated. The free energies of transfer of (1) in the initial state were calculated from the solubility of the complex [Co(4-Etpy)4Cl2]2[ReCl6]. The free energy of transfer of the cation (1) in the transition state was calculated using a free energy cycle. The effect of the solvent structure on (1) is dominant in the transition state, where −ΔG t o (1) transition >−ΔG t o (1) initial. Comparison of the present thermodynamic data with those obtained previously fortrans-[Co(4-Mepy)4Cl2]+, (2), andtrans-[Co(py4Cl2]+, (3) in the same solvent mixture, shows that the stability increases in the order: (1), (2)<(3) at low mole fraction of the co-solvent, contrary to expectation, while at high mole fraction the order of increasing stability is: (1)<(3)<(2). The results were interpreted on non-electrostatic grounds.
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