Conformation effects on the molecular orbitals of serine

doi:10.1088/1674-1056/20/3/033102

Abstract This paper calculates the five most stable conformers of serine with Hartree–Fock theory, density functional theory (B3LYP), Møller–Plesset perturbation theory (MP4(SDQ)) and electron propagation theory with the 6-311++G(2d,2p) basis set. The calculated vertical ionization energies for the valence molecular orbitals of each conformer are in agreement with the experimental data, indicating that a range of molecular conformations would coexist in an equilibrium sample. Information of the five outer valence molecular orbitals for each conformer is explored in coordinate and momentum spaces using dual space analysis to investigate the conformational processes, which are generated from the global minimum conformer Ser1 by rotation of C₂–C₃ (Ser4), C₁–C₂ (Ser5) and C₁–O₂ (Ser2 and Ser3). Orbitals 28a, 27a and 26a are identified as the fingerprint orbitals for all the conformational processes.

Keywords: serine conformers vertical ionization energies molecular orbital momentum distribution

Received: 10 April 2010
Revised: 11 August 2010
Accepted manuscript online:

PACS:	31.15.ae	(Electronic structure and bonding characteristics)
	33.15.Ry	(Ionization potentials, electron affinities, molecular core binding energy)
	31.15.xw	(Valence bond calculations)

Fund: Project supported by the Doctoral Research Fund of Henan Normal University, China (Grant No. 525449).

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Wang Ke-Dong(王克栋), Ma Peng-Fei(马鹏飞), and Shan Xu(单旭) Conformation effects on the molecular orbitals of serine 2011 Chin. Phys. B 20 033102

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Conformation effects on the molecular orbitals of serine

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