Compare isoelectronic octahedral carbonyls [W(CO)₆], [Re(CO)₆]⁺ and [Os(CO)₆]²⁺ in the ideal trend model. W,Re,Os are groups 6,7,8. For this comparison, increasing positive charge suppresses back-dona

Question

Compare isoelectronic octahedral carbonyls [W(CO)₆], [Re(CO)₆]⁺ and [Os(CO)₆]²⁺ in the ideal trend model. W,Re,Os are groups 6,7,8. For this comparison, increasing positive charge suppresses back-donation; neglect metal-size differences. Which statements follow?

TestHub · Accepted Answer

Oxidation states 0,+1,+2 all give six d electrons, plus twelve from CO. Less back-donation at higher positive charge leaves stronger C−O and higher frequency in Os. W has the most back-donation, so its C−O bond order is the lowest, not highest. D states the opposite effects of the same electron transfer on the two bonds.

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