首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Microwave Measurements of ~(14)N and D Quadrupole Coupling for(Z)-2-Hydroxypyridine and 2-Pyridone Tautomers
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Microwave Measurements of ~(14)N and D Quadrupole Coupling for(Z)-2-Hydroxypyridine and 2-Pyridone Tautomers

机译:(Z)-2-羟基吡啶和2-吡啶酮互变异构体〜(14)N和D四极偶合的微波测量

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Rotational spectra for the two tautomers(Z)-2-hydroxypyridine and 2-pyridone and their deuterated isotopomers were measured in the microwave range between 4 and 14 GHz using a pulsed beam Fourier transform microwave spectrometer.Nitrogen and deuterium quadrupole hyperfine structure was completely resolved for many of the observed transitions,and the measured ~(14)N quadrupole coupling tensors are quite different for these two tautomers.The eQq_(cc)(N)values have opposite signs.The ~(14)N quadrupole coupling strengths for(Z)-2-hydroxypyridine in the principal inertial axis system are as follows:eQq_(aa)(N)--0.076(11),eQq_(bb)(N)=-2.283(6),and eQq_(cc)(N)=2.359(6)MHz.The ~(14)N and D nuclear quadrupole coupling strengths for(Z)-2-deuteriohydroxypyridine in the principal inertial axis are eQq_(aa)(N)=-0.1465(4),eQq_(bb)(N)=-2.2045-(4),and eQq_(cc)(N)=2.3510(4)MHz and eQq_(aa)(D)=-0.0250(9),eQq_(bb)(D)=0.1699(4),and eQq_(cc)(D)=-0.1449(4)MHz.The ~(14)N quadrupole coupling strengths for 2-pyridone in the principal inertial axis system are eQq_(aa)(N)=1.496(4),eQq_(bb)(N)=1.269(4),and eQq_(cc)(N)=-2.765(4)MHz.The ~(14)N and D nuclear quadrupole coupling strengths for l-deuterio-2-pyridone in the principal inertial axis system are as follows:eQq_(aa)(N)=1.511(2),eQq_(bb)(N)=1.249(5),and eQq_(cc)(N)=-2.759(5)MHz and eQq_(aa){D)=-0.110(7),eQq_(bb)(D)=0.354(6),and eQq_(cc)(D)=-0.244(6)MHz.New,improved,experimental rotational constants were obtained for the H and D isotopomers of both tautomers.Kraitchman analysis indicates the "tautomeric"hydrogen atom is at a distance of 2.653(2)A in 2-hydroxypyridine and a distance of 2.124(1)A in 2-pyridone from the centers of mass of the two tautomers,respectively.The DFT calculated eQq(N)values for both the tautomers and the deuterated tautomers are in good agreement with the present experimental values.The Townes-Dailey model has been used to analyze the new quadrupole coupling data of the tautomers and the results are presented in terms of nitrogen atom p-orbital occupation numbers.
机译:使用脉冲束傅里叶变换微波光谱仪在4至14 GHz的微波范围内测量了两个互变异构体(Z)-2-羟基吡啶和2-吡啶酮及其氘代异构体的旋转光谱,氮和氘四极超精细结构得以完全解析对于许多观察到的跃迁,这两个互变异构体的实测〜(14)N四极耦合张量完全不同.eQq_(cc)(N)值具有相反的符号。惯性轴系统中的Z)-2-羟基吡啶如下:eQq_(aa)(N)-0.076(11),eQq_(bb)(N)=-2.283(6)和eQq_(cc)( N)= 2.359(6)MHz。(Z)-2-氘代羟基吡啶在惯性轴上的〜(14)N和D核四极耦合强度为eQq_(aa)(N)=-0.1465(4),eQq_ (bb)(N)=-2.2045-(4),而eQq_(cc)(N)= 2.3510(4)MHz和eQq_(aa)(D)=-0.0250(9),eQq_(bb)(D) = 0.1699(4),eQq_(cc)(D)=-0.1449(4)MHz.2-p的〜(14)N四极耦合强度主轴惯性系统中的吡啶酮为eQq_(aa)(N)= 1.496(4),eQq_(bb)(N)= 1.269(4)和eQq_(cc)(N)=-2.765(4)MHz。 l-氘-2-吡啶酮在惯性轴系统中的〜(14)N和D核四极耦合强度如下:eQq_(aa)(N)= 1.511(2),eQq_(bb)(N) = 1.249(5),并且eQq_(cc)(N)=-2.759(5)MHz和eQq_(aa){D)=-0.110(7),eQq_(bb)(D)= 0.354(6),并且eQq_(cc)(D)=-0.244(6)MHz。获得了两个互变异构体的H和D异构体的新的,改进的实验旋转常数。Kraitchman分析表明,“互变异构”氢原子的距离为2.653( 2)2-羟基吡啶中的A和2-吡啶酮中的2.124(1)A距两个互变异构体的质心的距离.DFT计算出的互变异构体和氘代互变异构体的eQq(N)值均在与目前的实验值吻合良好。Townes-Dailey模型已用于分析互变异构体的新四极偶合数据,并以s的氮原子p轨道职业数。

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