Gelişmiş Arama

Basit öğe kaydını göster

dc.contributor.authorArmentrout, P. B.
dc.contributor.authorCitir, Murat
dc.contributor.authorChen, Yu
dc.contributor.authorRodgers, M. T.
dc.date.accessioned2024-07-02T11:38:58Z
dc.date.available2024-07-02T11:38:58Z
dc.date.issued2012en_US
dc.identifier.issn1520-5215
dc.identifier.urihttps://doi.org/10.1021/jp310179c
dc.identifier.urihttps://hdl.handle.net/20.500.12573/2234
dc.description.abstractThe interactions of alkali metal cations (M+ = Na+ , K+ , Rb+ , Cs+ ) with the amino acid histidine (His) are examined in detail. Experimentally, bond energies are determined using threshold collision-induced dissociation of the M+ (His) complexes with xenon in a guided ion beam tandem mass spectrometer. Analyses of the energy dependent cross sections provide 0 K bond energies of 2.31 ± 0.11, 1.70 ± 0.08, 1.42 ± 0.06, and 1.22 ± 0.06 eV for complexes of His with Na+ , K+ , Rb+ , and Cs+ , respectively. All bond dissociation energy (BDE) determinations include consideration of unimolecular decay rates, internal energy of reactant ions, and multiple ion-neutral collisions. These experimental results are compared to values obtained from quantum chemical calculations conducted previously at the MP2(full)/6-311+G(2d,2p), B3LYP/6-311+G(2d,2p), and B3P86/6-311+G(2d,2p) levels with geometries and zero point energies calculated at the B3LYP/6-311+G(d,p) level where Rb and Cs use the Hay−Wadt effective core potential and basis set augmented with additional polarization functions (HW*). Additional calculations using the def2-TZVPPD basis set with B3LYP geometries were conducted here at all three levels of theory. Either basis set yields similar results for Na+ (His) and K+ (His), which are in reasonable agreement with the experimental BDEs. For Rb+ (His) and Cs+ (His), the HW* basis set and ECP underestimate the experimental BDEs, whereas the def2-TZVPPD basis set yields results in good agreement. The effect of the imidazole side chain on the BDEs is examined by comparing the present results with previous thermochemistry for other amino acids. Both polarizability and the local dipole moment of the side chain are influential in the energetics.en_US
dc.description.sponsorshipThis work is supported by the National Science Foundation, CHE-1049580 (P.B.A.) and CHE-0911191 (M.T.R.). A grant of computer time from the Center for High Performance Computing at the University of Utah is gratefully acknowledged.en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionof10.1021/jp310179cen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.titleThermochemistry of alkali metal cation interactions with histidine: Influence of the side chainen_US
dc.typearticleen_US
dc.contributor.departmentAGÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümüen_US
dc.contributor.authorID0000-0002-7957-110Xen_US
dc.contributor.institutionauthorCitir, Murat
dc.identifier.volume116en_US
dc.identifier.issue48en_US
dc.identifier.startpage11823en_US
dc.identifier.endpage11832en_US
dc.relation.journalJournal of Physical Chemistry Aen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US


Bu öğenin dosyaları:

Thumbnail

Bu öğe aşağıdaki koleksiyon(lar)da görünmektedir.

Basit öğe kaydını göster