Special Issue "Molecular Symmetry"
Deadline for manuscript submissions: closed (30 June 2012)
Dr. Vance Williams
Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby B.C., V5A 1S6, Canada
Phone: +1 778 782 8059
Fax: +1 778 782 3765
Interests: organic synthesis; liquid crystals; conjugated polymers; gels; self-assembly; molecular recognition; electronic materials; photochromism; novel aromatic systems
Ever since Dalton suggested that the 6-fold symmetry of ice crystals results from the packing of water molecules into hexagonal lattices, the concept of symmetry has been one of the central unifying themes of chemistry. Symmetry arguments, whether explicitly stated or implicitly assumed, underlie many of our most important chemical concepts and inform our understanding of the relationship between the molecular world and observable macroscopic properties. Indeed, it is impossible to engage in a meaningful discussion of many topics, such as abiogenesis, stereochemistry, color and crystallography, without reference to symmetry. Symmetry considerations underpin every step, from conception to culmination, in the process of creating new molecules. The language of synthesis is rife with symmetry-laden terms: chiral, racemic, isotactic, the Woodward-Hoffmann rules, stereoselective synthesis, enantiomer, epimerization, mirror planes and C2-axes, to name just a few examples. Characterization methods also rely heavily on understanding molecular symmetry: are protons homotopic, enantiotopic or diastereotopic? Is an optical transition allowed or forbidden? Materials properties, such as surface chemistry, ferroelectricity, birefringence and second harmonic generation, likewise depend on molecular and supramolecular symmetry. Symmetry can also manifests itself in the most unexpected places; for example, because low symmetry molecules are commonly more soluble than their higher symmetry analogues, isomers with differing symmetry often are conveniently separated by recrystallization.
Many of the examples listed above are well understood by chemists, while others are much less so. This special issue of the International Journal of Molecular Sciences is dedicated to exploring the major lacunae that remain in our understanding of molecular symmetry. Topics to be addressed may include, but are not limited to, challenges in organic synthesis, the effects of symmetry on self-assembly processes, symmetry breaking in the origins of life and the properties of bulk materials.
Vance Williams, Ph.D.
- materials properties
Article: A Molecular–Structure Hypothesis
Int. J. Mol. Sci. 2010, 11(11), 4267-4284; doi:10.3390/ijms11114267
Received: 28 September 2010; in revised form: 25 October 2010 / Accepted: 25 October 2010 / Published: 1 November 2010| Download PDF Full-text (259 KB) | Download XML Full-text
Int. J. Mol. Sci. 2011, 12(1), 317-333; doi:10.3390/ijms12010317
Received: 2 December 2010; in revised form: 7 January 2011 / Accepted: 12 January 2011 / Published: 13 January 2011| Download PDF Full-text (528 KB) | Download XML Full-text
Article: Molecular Arrangement in Self-Assembled Azobenzene-Containing Thiol Monolayers at the Individual Domain Level Studied through Polarized Near-Field Raman Spectroscopy
Int. J. Mol. Sci. 2011, 12(2), 1245-1258; doi:10.3390/ijms12021245
Received: 27 January 2011; in revised form: 10 February 2011 / Accepted: 11 February 2011 / Published: 21 February 2011| Download PDF Full-text (341 KB) | Download XML Full-text
Article: The Structure Lacuna
Int. J. Mol. Sci. 2012, 13(7), 9081-9096; doi:10.3390/ijms13079081
Received: 6 June 2012; in revised form: 10 July 2012 / Accepted: 12 July 2012 / Published: 20 July 2012| Download PDF Full-text (223 KB) | Download XML Full-text
Int. J. Mol. Sci. 2012, 13(11), 14356-14384; doi:10.3390/ijms131114356
Received: 25 July 2012; in revised form: 16 August 2012 / Accepted: 5 October 2012 / Published: 6 November 2012| Download PDF Full-text (16474 KB) | Download XML Full-text
Int. J. Mol. Sci. 2013, 14(1), 714-806; doi:10.3390/ijms14010714
Received: 3 September 2012; in revised form: 26 November 2012 / Accepted: 27 November 2012 / Published: 4 January 2013| Download PDF Full-text (17475 KB) | Download XML Full-text
Last update: 26 February 2014