Symmetry in Chemical Bonding - Molecular Symmetry - page 295

the symmetry of metal d-states in T d was covered in Section 5.8. Complexes of Cr 2 +
usually have tetrahedral geometries, while those of Cr 3 + are more likely square planar.
Explain why this should be the case by comparing your T d MO diagram with the D 4h
example in the text.
6. In CO 2 and in SO 2 the two O atoms are related by symmetry. Derive MO diagrams for
each molecule. Why should CO 2 be linear while SO 2 is not?
Further Reading
Physical data, such as ionization potentials and reference spectra can be obtained from the
US National Institute of Standards and Technology (NIST), at http://physics.nist.gov/.
References for electronegativity scales can be found in the following:
Pauling P (1932) The nature of the chemical bond. IV. The energy of single bonds and the relative
electronegativity of atoms. Journal of the American Chemical Society 54 : 3570.
Pauling P (1970) General Chemistry . Dover Publications, New York (ISBN 0-486-65622-5).
Allred AL (1961) Electronegativity values from thermochemical data. Journal of Inorganic Nuclear
Chemistry 17 : 215.
A very comprehensive coverage of chemical bonding with examples from relevant
experimental data is given in:
DeKock RL, Gray HB (1989) Chemical Structure and Bonding . University Science Books, Mill
Valley, CA (ISBN 0-935702-61-X).
The quantum chemistry of atomic states and bond formation is discussed in more detail
by:
Atkins PW, Friedman RS (1997) Molecular Quantum Mechanics . Oxford University Press (ISBN
0-19-855947-X).
Calculation of the bond energy of H 2 + with larger basis sets, and much more detailed
coverage of quantum chemistry in general, can be found in:
McQuarrie DA (2008) Quantum Chemistry . University Science Books, Mill Valley, CA (ISBN 978-
1-891389-50-4).
A fuller discussion of MO theory applied to transition metal complexes can be found in:
Kettle SFA (1998) Physical Inorganic Chemistry: A Coordination Chemistry Approach . Oxford
University Press (ISBN 0 19 850404 7).
A full discussion of the experimental electron density plot of Figure 7.3 can be found in:
Hibbs DE, Hanrahan JR, Hursthouse MB, Knight DW, Overgaard J, Turner P, Piltz RO, Waller MP
(2003) Organic & Biomolecular Chemistry 1 : 1034-1040.