References
267
is certainly compatible with the measured bond-lengths of
2
4
Br
. The terminal and
central bond-lengths of 2.98 Å and 2.43 Å are appreciably longer than the 2.28 Å
for free 2
Br
13 .
For each of the structures (31) and (32), there is an “increased-valence”
representation for the 6-electron 4-centre bonding unit, and we remind the reader
that its wave-function corresponds to the covalent component of the delocalized
molecular orbital configuration for the six electrons (Section 10-2). The relevant
atomic orbitals for
2
4
Br
are displayed in Fig. 2-6.
References
1. R.S. Mulliken and B. Person, Molecular Complexes, Wiley, New York, p.3 (1969).
2. R.S. Mulliken and B. Person, Physical Chemistry, An Advanced Treatise, (H. Eyring,
D. Henderson and W. Jost, Eds.) Vol. IIII, p. 537, Academic Press, New York, London
(1969).
3. R.S. Mulliken, J. Chim. Phys., 61, 20 (1964).
4. O. Hassel and C. Rømming, Quart. Revs., 16, 1 (1962).
5. H. Pritzkow, Acta Cryst., B31, 1589 (1975) and Table 5 therein.
6. S.J. La Placa, W.C. Hamilton, B. Kamb and A. Prakash, J. Chem. Phys., 58, 567
(1973).
7. W.S. Benedict, N. Gailar and E.K. Plyler, J. Chem. Phys., 24, 1139 (1956).
8. R.D. Harcourt, (a) J. Chem. Educ. 45, 779 (1968); 46, 856 (1969); (b) J. Mol. Struct., 5,
199 (1970); (c) Aust. J. Chem., 28, 881 (1975).
9. J. Emsley, Chem. Soc. Revs., 9, 91 (1980) and references therein.
10. J.M. Williams and L.F. Schneemeyer, J. Amer. Chem. Soc. 95, 5730 (1973).
11. W.P. Kraemer and G.H.F. Diercksen, Theor. Chim. Acta, 23, 398 (1972) and references
therein.
12. R.A. Firestone, J. Org. Chem., 36, 702 (1971).
13. R. Siepmann and H.G. von Schnering, Z. für Anorg. Chem., 357, 289 (1968).
267
is certainly compatible with the measured bond-lengths of
2
4
Br
. The terminal and
central bond-lengths of 2.98 Å and 2.43 Å are appreciably longer than the 2.28 Å
for free 2
Br
13 .
For each of the structures (31) and (32), there is an “increased-valence”
representation for the 6-electron 4-centre bonding unit, and we remind the reader
that its wave-function corresponds to the covalent component of the delocalized
molecular orbital configuration for the six electrons (Section 10-2). The relevant
atomic orbitals for
2
4
Br
are displayed in Fig. 2-6.
References
1. R.S. Mulliken and B. Person, Molecular Complexes, Wiley, New York, p.3 (1969).
2. R.S. Mulliken and B. Person, Physical Chemistry, An Advanced Treatise, (H. Eyring,
D. Henderson and W. Jost, Eds.) Vol. IIII, p. 537, Academic Press, New York, London
(1969).
3. R.S. Mulliken, J. Chim. Phys., 61, 20 (1964).
4. O. Hassel and C. Rømming, Quart. Revs., 16, 1 (1962).
5. H. Pritzkow, Acta Cryst., B31, 1589 (1975) and Table 5 therein.
6. S.J. La Placa, W.C. Hamilton, B. Kamb and A. Prakash, J. Chem. Phys., 58, 567
(1973).
7. W.S. Benedict, N. Gailar and E.K. Plyler, J. Chem. Phys., 24, 1139 (1956).
8. R.D. Harcourt, (a) J. Chem. Educ. 45, 779 (1968); 46, 856 (1969); (b) J. Mol. Struct., 5,
199 (1970); (c) Aust. J. Chem., 28, 881 (1975).
9. J. Emsley, Chem. Soc. Revs., 9, 91 (1980) and references therein.
10. J.M. Williams and L.F. Schneemeyer, J. Amer. Chem. Soc. 95, 5730 (1973).
11. W.P. Kraemer and G.H.F. Diercksen, Theor. Chim. Acta, 23, 398 (1972) and references
therein.
12. R.A. Firestone, J. Org. Chem., 36, 702 (1971).
13. R. Siepmann and H.G. von Schnering, Z. für Anorg. Chem., 357, 289 (1968).