具π共軛(π conjugation)之分子及高分子已廣泛應用於有機光電材料，而材料的吸收及放射光波長之調控，可以由有機分子結構之設計來達成。除了利用增長線性π共軛分子之長度外，加入推拉電子基(ElectronDonor and Acceptor)於π共軛分子的兩側所形成之D-π-A分子，會具有分子內電荷轉移之能力，也是有效使吸收及螢光光譜紅移並調控其波長的方法。
當分子結構中同時含有推電子基(Donor)與拉電子基(Acceptor)的共軛系統，
透過光的激發和π軌域重疊的共軛性，電子可由推電子基轉移到拉電子基上，使
分子具有分子內電荷轉移(intramolecular charge transfer，ICT)的特性，此分子構
形經常被拿來探討。
聚聯苯化合物(polyphenylenes)為常見的π共軛系統，其具推拉電子基的衍生物顯示其具有分子內電荷轉移的效果3。而近年來，萘(naphthalene)及蒽(anthracene) 也逐漸成為光電材料研究的π共軛單元。相較於聚苯化合物，其結構特徵為「具有垂直於線型π共軛主鏈之額外苯環」。運用萘及蒽單元於π共軛系統中，可能提供更多共軛π軌域之好處，但也可能存在具較大兩面角之結構破壞軌域重疊之缺點。因此，我們合成了具推拉電子基之1,4-二苯基苯、1,4-二苯基萘、1,4-二苯基蒽及9,10-二苯基蒽四個系列化合物及其相對應之分子，有系統的研究萘及蒽在D-π-A分子系統中之影響。

π-conjugatedmolecular and polymeric materials have been used on the organic photoelectronics, and we can design the molecular structure of organic materials to regulate the molecular absorption and emission wavelength.In addition to increase the linear π conjugation length ,adding the electron donor and acceptor in π-conjugated D-π-A molecule will have the ability to cause charge transfer within the molecule and regulate its photophysics .The molecular structure which has a πconjugated system with electron donor and acceptor, through the light excitation and electron transfer via overlapped π orbitalsfrom electron donor to acceptor,has the characteristics of intramolecular charge transfer .
In recent years, naphthalene and anthracene are studied in application on the π conjugated units of optoelectronic materials. Compared with polyphenylenes, naphthalene and anthracene possess the structure of " with an additional benzene perpendicular to the π-conjugated main chain ",the use of naphthalene and anthracene units in π-conjugated systems may either provide more conjugated π orbitals or lead to a larger dihedral angle that may destroy the original π conjugation.
Thus, we study on synthesis and photophysics of diphenyl benzene, naphthalene, anthracene with electron donor and acceptor groups.

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