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Grade 11Organic Chemistry

Why do K2PtCl6 exists but K2NiCl6 doesn't exist????
Explain the reason why...
Thanks a lot🙏 🙏 🙏 🙏

Profile image of Riik
7 Years agoGrade 11
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1 Answer

Profile image of Arun
7 Years ago
Ni(IV) is a rare oxidation state for Ni: it costs too much energy to form Ni(IV) that is not gained back by forming six Ni-X bonds; Pt(IV) is relatively common. That said [NiCl6]^2- will not form for steric reasons: it impossible to fit six Cl^- around the small "Ni^4+" ion but six Cl^- ligands can fit around the larger Pt(IV) ion. [NiF6]^2- is known.

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