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时间:2020-03-26
《氢键复合物中键长变化与振动频率移动相关性重访.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学~(WuliHuaxueXuebao)MarchActa.一Chim..2012,28(3),499-503499[Communication】doi:10.3866/PKU.WHXB201112303www.whxb.pku.edu.cn氢键复合物中键长变化与振动频率移动相关性重访张愚马宁王伟周(洛阳师范学院化学化工学院,河南洛阳471022)摘要:X—H⋯Y(Y为电子供体)型氢键形成时,X—H键长伸长或缩短与相应的X—H伸缩振动频率红移或蓝移存在较强的相关性,这也是氢键光谱检测和研究的基础.但是,最近的理论研究却推翻了这一观点,认为X—H键长变化和相应的X—H伸缩振
2、动频率移动在有些氢键体系中并不存在相关性(McDowell,S.A.C.:Buckingham,A.D.Am,Chem.Soc.2005,127,15515.).本文中,我们采用更为可信的计算方法,对这一问题进行再研究.结果表明是错误的计算方法导致了McDowell和Buckingham得出错误的结论.在McDowell和Buckingham所研究的氢键体系中,X—H键长变化和相应的X—H伸缩振动频率移动仍存在较强的相关性.关键词:氢键复合物;相关:键长变化;振动频率移动:密度泛函理论中图分类号:O641CorrelationbetweenBond·LengthChangeand
3、VibrationalFrequencyShiftinHydrogen-BondedComplexesRevisitedZHANGYuMANingWANGWei—Zhou(CollegeofChemistryandChemicalEngineering,LuoyangNormalUniversity,Luoyang471022,HenanProvince,PR.China)Abstract:ThecorrelationbetweentheX—Hbond.1engthchangeandthecOrrespOndingX—HstretchingfrequencyshiftuponX—
4、H⋯Y(YiSanelectrondonor)hydrogenbondformationiSthebasisforthespectroscopicdetectionandinvestigationofthehydrogenbond.However,thisviewhasbeenquestionedinarecentreport,suggestingthatthewidelyacceptedcorrelationbetweenthebond—lengthchangeandthefrequencyshiftinhydrogen—bondedcomplexesisunreliable(
5、McDowell,S.A.C.:Buckingham,A.D.Am.Chem.Soc.2005,127,15515.).1nthiswork,severalrobustcomputationalmethodshavebeenusedtoinvestigatethisissue.TheresultsclearlyshowthatacomputationalartifaclIeadslOtheconclusionincorrectlyreportedbyMcDowelIandBuckinghamandthatthecorrelationbetweentheX—Hbond.1ength
6、changeandthecorrespondingX——Hstretchingfrequencyshiftisstillverygoodinthehydrogen-bondedcomplexesstudied.KeyWords:Hydrogen-bondedcomplex;Correlation;Bond—lengthchange;Vibrationalfrequencyshift;Densityfunctionaltheory1lntroducti0nmolecularassembly,materialsscience,andbiologicalsystem.In—Hydrog
7、enbondisoneofthemostimportantnoncovalentin.flaredandRamanspectroscopieshaveplayedimportantrolesteractions,whichplayskeyrolesincrystalengineering,supra—inthedetectionofthehydrogenbonds:conventionalX—H⋯Received:November4,201l;Revised:December27
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