Changing ligands around a metal center can shift its redox potential significantly. How do ligand field strength, π-backbonding, and electron donation alter this shift? I'd like to know if there are predictive rules that accurately estimate redox shifts with ligand substitution.
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1$\begingroup$ It could be transformed to question about relative complex stability for the oxidized and reduced metal form. $\endgroup$Poutnik– Poutnik2025-09-23 04:55:18 +00:00Commented Sep 23, 2025 at 4:55
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$\begingroup$ related chemistry.stackexchange.com/questions/147956/… chemistry.stackexchange.com/questions/8867/… chemistry.stackexchange.com/questions/124917/… $\endgroup$Mithoron– Mithoron2025-09-23 12:20:55 +00:00Commented Sep 23, 2025 at 12:20
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1$\begingroup$ And yeah, in this form it's too broad, but if it was just stability constant vs potential, not like everything that influences the constant... $\endgroup$Mithoron– Mithoron2025-09-23 12:24:53 +00:00Commented Sep 23, 2025 at 12:24
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$\begingroup$ @Poutnik Thanks. So you’re saying the redox potential shifts essentially reflect differences in the relative stabilities of the metal’s oxidized and reduced states? I’d love to hear if there are models or equations that relate stability constants directly to redox potentials. $\endgroup$Anushka_Grace Chattopadhyay– Anushka_Grace Chattopadhyay2025-09-25 23:43:27 +00:00Commented Sep 25, 2025 at 23:43
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$\begingroup$ In equilibrium, redox potentials of all present metal complexes must be equal, including implicit aqua complexes. If you compute ratio of respective reduced and oxidized metal forms, you can calculate approximate standard reduction potentials for particular complex. But the catch is, reaching the equilibrium. This is often kinetically challenged. $\endgroup$Poutnik– Poutnik2025-09-26 07:15:31 +00:00Commented Sep 26, 2025 at 7:15
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