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MO diagrams for homonuclear diatomics

Explore bonding schemes for dimerization of transition metal dications such as Cr2+, Mn2+, Fe2+, and Hg2+ leading to different bond orders. Learn about the phenomenon of multiple metal-metal bonds exemplified through diagrams and examples.

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MO diagrams for homonuclear diatomics

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  1. MO diagrams for homonuclear diatomics

  2. su* (z2) pg*(xz, yz) du*(xy, x2-y2) dg(xy, x2-y2) d d pu(xz, yz) sg(z2) M2+ M2+ M24+ Bonding scheme for dimers of transition metal dications, M2+

  3. Example: dimerization of Cr2+to form Cr24+ su* (z2) pg*(xz, yz) du*(xy, x2-y2) dg(xy, x2-y2) d4 d4 pu(xz, yz) sg(z2) Cr2+ Cr2+ Cr24+

  4. Example: dimerization of Cr2+to form Cr24+ su* (z2) pg*(xz, yz) du*(xy, x2-y2) dg(xy, x2-y2) d4 d4 pu(xz, yz) sg(z2) Cr2+ Cr2+ Cr24+ Bond order = ½ (8-0)= 4 (quadruple bond!!!)

  5. F. Albert Cotton….King of multiple metal-metal bonds!!

  6. su* (z2) pg*(xz, yz) du*(xy, x2-y2) dg(xy, x2-y2) d5 d5 pu(xz, yz) sg(z2) Mn2+ Mn2+ Mn24+ Example: dimerization of Mn2+to form Mn24+ Bond order = ½ (10-0)= 5 (quintuple bond!!!)

  7. su* (z2) pg*(xz, yz) du*(xy, x2-y2) dg(xy, x2-y2) d6 d6 pu(xz, yz) sg(z2) Fe2+ Fe2+ Fe24+ Example: dimerization of Fe2+to form Fe24+ Bond order = ½ (10-2)= 4

  8. su* (z2) pg*(xz, yz) du*(xy, x2-y2) dg(xy, x2-y2) d10 d10 pu(xz, yz) sg(z2) Hg2+ Hg2+ Hg24+ Example: dimerization of Hg2+to form Hg24+ Bond order = ½ (10-10)= 0 (No bond!!)

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