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Structure and Luminescence Properties of Poly(l-hexyl-3,4-dimethyl-2,5-pyrrolylene)

机译:聚(1-己基-3,4-二甲基-2,5-亚吡咯基)的结构和发光性能

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摘要

A poly(l-hexyl-3,4-dimethyl-2,5-pyrrolylene) (PHDP) was prepared and its luminescence in tetrahydrofuran (THF) was studied.When PHDP is excited by UV light,it produces very strong blue luminescence.The quantum yield of PHDP (Q - 36.9%) is much greater than that of the monomer,l-hexyl-3,4-dimethylpyrrole (HDP) with Q=0.61%.The principal luminescence of PHDP has a single decay component with ca.1 ns,whereas the decay of HDP is complicated.The molecular structure and conformational behavior of HDP and the oligomers up to trimer have been also determined by ab initio Hartree-Fock (HF/6-31G~(**)),density functional theory (DFT-B3LYP/6-31G~(**)),and semiempirical (ZINDO) methods.According to the results of calculations,it is proposed that the enhanced quantum yield of the polymer PHDP results mostly from the pi-conjugation between neighboring pyrrole rings.
机译:制备了聚(1-己基-3,4-二甲基-2,5-亚吡咯基)(PHDP),研究了其在四氢呋喃(THF)中的发光。当PHDP被紫外光激发时,会产生很强的蓝色发光。 PHDP的量子产率(Q-36.9%)远高于Q = 0.61%的单体1-己基-3,4-二甲基吡咯(HDP)的量子产率.PHDP的主要发光具有单个衰变分量,其中ca .1 ns,而HDP的衰减复杂。HDP的分子结构和构象行为以及三聚体直至三聚体的低聚物还通过从头算起Hartree-Fock(HF / 6-31G〜(**)),密度来确定根据功能理论(DFT-B3LYP / 6-31G〜(**))和半经验(ZINDO)方法。根据计算结果,建议提高聚合物PHDP的量子产率主要来自π共轭。在相邻的吡咯环之间。

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