Question

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Subject: Inorganic Chemistry

Question: Below are polynuclear complexes. CALCULATE the numbers of metal-metal (M-M) bond and then , ELUCIDATE the structure.

(a) Cp2 Ni2Fe (M3-S) (CO)3 (b) [CpMo(CO)2]2

Answer 1

And every metal atom have satisfied the 18e - rule Ni Cp 10+ 5 Ni + 1+ s Fe 1+1 1 - =18 Ž 2 Fe same Fe 300s Ni, No 1310 The of the compound is structure Coco eo FÉ ep Ni NigCp

6) Similarly, for the compound [ep Mo (Co),] total no. of valence electrons are 30 (cp=5+ M0 = 6 + 2.00 =4)] Hence total no. of metal metal no. of metal atom bond is 3x18-30 36-30 and both the metal centre satisfies 18 ett rule. On Mo 260 cp 3MM Mol > 6+(2+2)+5+3=18 Moe > similar Hence the structure of the compound ep co - Mo = EMO = Mo - co co

a) CP₂ Niz Fe (M3-3) (CO₂ b) [Cp Mo (Co), I 7 a) C. p. Nig Fe (M3-5) (CO). According to 18 e rule the number of electron count in homoleptic polynuclear metal unx 18 (where in anumber of metal atoms) Now valence electrons of Fe=8 Nig = 10x2= 20 CP2 = 5x2 = 10 (M3-5) = 4 (CO)₂ = 6 Total = 48 Total electron count in this polynuclear metal = nx 18 = 3418 = 54 metal-metal bond = 54-48 . No. of
The total numbers of metal-metal bond for both of the complex is 3 and the calculation and the structure is given in the attached images.