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A Theoretical Study of Large Planar[N]Phenylenes

机译:大平面[N]亚苯基的理论研究

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摘要

Ab initio studies of 14[N]phenylenes containing 12-membered rings furnish geometries,energies,standard heats of formation,NICS(1)values,and proton chemical shifts.The extent of double-bond localization,DELTA R(in A),for each type of the 58 unique six-membered rings-angular,branched,and terminal-varies linearly with both their NICS(1)values and proton resonances.Values of these parameters depend upon the number and type of neighboring rings.DELTA R_(tot),the molecular sum of the bond localizations,correlates linearly with the ab initio energy and heat of formation.Reactions that conserve the numbers of angular,branched,terminal,and 12-membered rings are fhermoneutral,and their net DELTA R_(tot)and DELTA NICS(1)are also nearly zero.
机译:从头算研究含12元环的14 [N]亚苯基可提供几何形状,能量,标准形成热,NICS(1)值和质子化学位移。双键局域化程度,DELTA R(in A),对于58个独特的六元环中的每种类型,它们的NICS(1)值和质子共振均呈线性,角形,支链和末端线性变化,这些参数的值取决于相邻环的数量和类型。 tot),键位的分子总和与从头算能量和形成热成线性关系。保留角,支链,末端和12元环的数目的反应是荧光中性的,其净DELTA R_(tot )和DELTA NICS(1)也几乎为零。

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