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Triplet states of cyclopropeny lidene and its isomers

机译:环丙烯利德及其异构体的三重态

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The unique importance of the cyclopropeny lidene molecule conveys significance to its low-lyingisomers. Eleven low-lying electronic triplet stationary points as well as the two lowest singletstructures of C_3H_2have been systematically investigated. This research used coupled cluster (CC)methods with single and double excitations and perturbative triple excitations [CCSD(T)] andDunning's correlation-consistent polarized valence cc-pVXZ (where X=D, T, and Q) basis sets.Geometries, dipole moments, vibrational frequencies, and associated infrared intensities of thetargeted molecules have been predicted. The electronic ground state of cyclopropenylidene (3S, the global minimum) is the X ~1A_1state with C_(2v)point group symmetry. Among the 11 triplet stationarypoints, 7 structures are found to be minima, 2 structures to be transition states, and 2 structures tobe higher-order saddle points. For the six lowest-lying triplet structures and singlet propadienylidene(2S), relative energies (zero-point vibrational energy corrected values in parentheses) with respect tothe global minimum [ X ~1A_1(3S)]at the cc-pVQZ-UCCSD(T) level of theory are predicted to be propynylidene ~3B(laT)15 .5 (11.3) ropadienylidene[~1A_1(2S)]14.2(13.3)<3B_1(2T)]45.0(43.8)
机译:环丙烯利德分子的独特重要性为其低分子异构体传达了重要意义。已经系统地研究了11个低洼电子三重态固定点以及C_3H_2的两个最低单峰结构。这项研究使用了具有单激发和双激发以及微扰三激发[CCSD(T)]和Dunning的相关一致极化价cc-pVXZ(其中X = D,T和Q)基集的耦合簇(CC)方法。已经预测了目标分子的瞬间,振动频率和相关的红外强度。环丙烯基的电子基态(3S,全局最小值)是具有C_(2v)点群对称性的X〜1A_1状态。在11个三重态固定点中,发现7个结构为极小点,2个结构为过渡态,2个结构为高阶鞍点。对于六个最低位的三重态结构和单峰丙烯二烯(2S),相对能量(括号中的零点振动能量校正值)相对于cc-pVQZ-UCCSD(T的全局最小值[X〜1A_1(3S)] )理论水平预计为丙炔〜3B(laT)15 .5(11.3)<丙二烯叉[[1A_1(2S)] 14.2(13.3)<3B_1(2T)] 45.0(43.8)<环丙烯叉[〜3A(3aT) )] 53.8(52.5)<环丙炔[〜3B_2(4aT)] 70.0(70.6)<环丙烯基[〜3B_1(3cT)] 71.2(69.9)<反式亚烷基[〜3A“(5T)] 73 .6(70.7) kcal mol〜(-1)。[C(〜3P)+ C_2H_2(X〜1Σ_g〜+)]系统相对于全局最小值(3S)的总能量确定为107.4(103.8)kcal mol〜(- 1)。因此,这六个三重态平衡结构在能量上都远低于[C(〜3P)+ C_2H_2(X〜1Σ_g〜+)]的解离极限。

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