Theoretical investigation on the effect of different nitrogen donors on intramolecular Se···N interactions

Sarma, Bani Kanta ; Mugesh, Govindasamy (2009) Theoretical investigation on the effect of different nitrogen donors on intramolecular Se···N interactions ChemPhysChem, 10 (17). pp. 3013-3020. ISSN 1439-4235

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/cphc.20...

Related URL: http://dx.doi.org/10.1002/cphc.200900332

Abstract

The effect of different donor nitrogen atoms on the strength and nature of intramolecular Se···N interactions is evaluated for organoselenium compounds having N,N-dimethylaminomethyl (dime), oxazoline (oxa) and pyridyl (py) substituents. Quantum chemical calculations on three series of compounds [2-(dime)C6H4SeX (1a-g), 2-(oxa)C6H4SeX (2a-g), 2-(py)C6H4SeX (3a-g); X=Cl, Br, OH, CN, SPh, SePh, CH3] at the B3LYP/6-31G(d) level show that the stability of different conformers depends on the strength of intramolecular nonbonded Se···N interactions. Natural bond orbital (NBO), NBO deletion and atoms in molecules (AIM) analyses suggest that the nature of the Se···N interaction is predominantly covalent and involves nN→σSe—X orbital interaction. In the three series of compounds, the strength of the Se·· ·N interaction decreases in the order 3>2>1 for a particular X, and it decreases in the order Cl>Br>OH>SPh≈CN≈SePh>CH3 for all the three series 1-3. However, further analyses suggest that the differences in strength of Se···N interaction in 1-3 is predominantly determined by the distance between the Se and N atoms, which in turn is an outcome of specific structures of 1, 2 and 3, and the nature of the donor nitrogen atoms involved has very little effect on the strength of Se···N interaction. It is also observed that Se···N interaction becomes stronger in polar solvents such as CHCl3, as indicated by the shorter rSe···N and higher ESe···N values in CHCl3 compared to those observed in the gas phase.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Bonding Analysis; Density Functional Calculations; Nitrogen; Nonbonded Interactions; Selenium
ID Code:79304
Deposited On:25 Jan 2012 06:33
Last Modified:25 Jan 2012 06:33

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