Number the four sites of the cyclobutadienyl dianion cyclically and apply the Hückel method. The orthonormal pi basis gives
(1)
A convenient real orthonormal eigenbasis is
(2)
Thus one bonding and two degenerate nonbonding orbitals are filled, and the antibonding orbital is empty. There are six pi electrons, including the two added by the dianion charge. Rotating the two occupied nonbonding orbitals within their degenerate subspace changes their individual sketches but not the total density matrix.
Figure 1.
Original orbital levels and occupations for the four-site dianion and valence O2
. Details.

Ancestors (13)

  1. 18
  2. Section A
  3. Paper 2A
  4. 2022
  5. Past exam of the chemistry course of the year 3 of the natural sciences course of the University of Cambridge
  6. Chemistry course of the year 3 of the natural sciences course of the University of Cambridge
  7. Year 3 of the natural sciences course of the University of Cambridge
  8. Year of the natural sciences course of the University of Cambridge
  9. Natural sciences course of the University of Cambridge
  10. Course of the University of Cambridge
  11. University of Cambridge
  12. List of universities
  13. Home

View article source

Discussion (0)

New discussion

There are no discussions about this article yet.

Articles by others on the same topic (0)

There are currently no matching articles.
See all articles in the same topic Create my own version