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Current Inorganic Chemistry
ISSN (Print): 1877-9441
ISSN (Online): 1877-945X
VOLUME: 3
ISSUE: 3
DOI: 10.2174/1877944103666140110230538      Price:  $58









Exploring Bonding in Heavy Atom Chemistry with Dirac-Exact Methods

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Author(s): Wenli Zou, Michael Filatov and Dieter Cremer
Pages 220-234 (15)
Abstract:
The normalized elimination of the small component (NESC) method is a first principles 2-component relativistic approach that leads to the Dirac-exact description of one-electron systems. It is a powerful method to routinely investigate chemical and physical properties of molecules containing relativistic atoms. The vibrational modes of mercury halides are investigated to derive via the corresponding local HgX (X = H, F, Cl, Br, I, At) stretching modes an appropriate measure for the HgX bond strength. It is shown that HgF bonding in HgF4 is stronger than that in HgF2, which is a result of enhanced charge transfer from Hg to the four F atoms and the formation of electron deficient 2e-4c bonds with strong ionic character. A generally applicable bonding model for HgX molecules is outlined.
Keywords:
Dirac-exact relativistic methods, local vibrational modes, mercury bonding, Normalized Elimination of the Small Component (NESC), spin-orbit coupling, .
Affiliation:
CATCO, Department of Chemistry, Southern Methodist University, 3215 Daniel Ave, Dallas, Texas 75275-0314, USA.