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Microwave Spectra, Structure, and the Aromatic Character of 1-Chloroborepin

机译:微波光谱,结构和1-氯叶蛋白的芳族特征

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High resolution microwave spectra for the somewhat unstable compound 1-chloroborepin were measured in the 5–10 GHz range using a pulsed beam Fourier transform microwave spectrometer. Transitions were assigned and measured for three isotopologues, which include the most abundant isotopologue, ~(11)B~(35)Cl, and the less abundant ~(10)B~(35)Cl and ~(11)B~(37)Cl isotopologues. The molecular parameters (MHz) determined for the ~(11)B~(35)Cl isotopologue are A = 3490.905(35), B = 1159.38520(79), C = 870.59492(56), 1.5χ_( aa ) (~(11)B) = ?0.220(22), 0.25(χ_( bb ) – χ_( cc )) (~(11)B) = ?1.5300(99), 1.5χ_( aa ) (~(35)Cl) = ?54.572(33), and 0.25(χ_( bb ) – χ_( cc )) (~(35)Cl) = 4.7740(79). The inertial defect is calculated to be Δ = ?0.174 amu ?~(2) from the experimental rotational constants, indicating a planar structure with some out of plane vibrational motion. An extended Townes–Dailey analysis was performed on the ~(11)B and ~(35)Cl nuclei to determine the electron occupations in the valence hybridized orbitals using the experimental quadrupole coupling strengths. From the analysis it was determined that Cl is sharing some electron density with the empty p-orbital on B. The B–Cl bond length determined from the data is 1.798(1) ?, and the B–C bond lengths are 1.533(10) ?. The structural parameters and electronic structure properties of 1-chloroborepin are consistent with an aromatic boron-containing molecule.
机译:使用脉冲束傅里叶变换微波谱仪在5-10GHz范围内测量用于稍微不稳定的化合物1-氯泊酚的高分辨率微波光谱。分配和测量三位同位素的过渡,包括最丰富的同位素,〜(11)B〜(35)Cl,较少的〜(10)B〜(35)Cl和〜(11)B〜(37 )Cl同表现。测定的〜(11)B〜(35)Cl同表尼文学测定的分子参数(MHz)是A = 3490.905(35),B = 1159.38520(79),C = 870.59492(56),1.5°(AA)(〜( 11)B)= 0.220(22),0.25(χ_(BB) - χ(CC))(〜(11)B)=?1.5300(99),1.5 _(AA)(〜(35)CL)= ?54.572(33)和0.25(χ(BB) - χ(CC))(〜(35)Cl)= 4.7740(79)。从实验旋转常数计算惯性缺陷是Δ= 0.174 AMU?〜(2),表明平面结构与平面振动运动有一些。在〜(11)B和〜(35)CL核上进行扩展的排队 - Dailey分析,以确定使用实验四极耦合强度的价杂交轨道中的电子占用。从分析中,确定CL在B上与空的P轨道分享一些电子密度。从数据确定的B-CL键合长度为1.798(1)?,B-C键长度为1.533(10 )? 1-氯硼吡氏素的结构参数和电子结构性质与含芳族硼的分子一致。

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