Structure, energetics and vibrational spectra of protonated chlortetracycline in the gas phase: An experimental and computational investigation

被引：6

作者：

Ziegler, Blake E. ^{[1
]}

Marta, Rick A. ^{[1
]}

Martens, Sabrina M. ^{[1
]}

Martens, Jonathan K. ^{[1
]}

McMahon, Terry B. ^{[1
]}

机构：

[1] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

来源：

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY | 2012年 / 316卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Tetracylcine; IRMPD; Gaseous ion structure; Gaseous ion thermochemistry; Electronic structure calculations; IRMPD SPECTROSCOPY;

D O I：

10.1016/j.ijms.2012.02.025

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

Infrared Multiple Photon Dissociation (IRMPD) Spectroscopy has been used to generate gas phase vibrational spectra for six protonated tetracycline derivatives: chlortetracycline, meclocycline, minocycline, doxycycline, tetracycline, and metacycline. The IRMPD spectrum for protonated chlortetracycline is compared here to theoretical gas phase vibrational spectra obtained from geometry optimization and frequency electronic structure calculations using the B3LYP hybrid density functional method with the 6-311 + G(d,p) basis set. The most energetically favorable protonation sites, tautomer structures, and hydrogen bond orientations were determined. Protonation at the dimethyl amine functional group and an extensive hydrogen bonding network lead to the most energetically favourable structures. Calculated spectra directly resembled the IRMPD spectrum, supporting the conclusion that the probable gas phase structure of protonated chlortetracycline has been determined. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：117 / 125

页数：9

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