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机构地区:[1]吉林化工学院化学与制药工程学院,吉林吉林132022
出 处:《广州化工》2014年第12期8-10,共3页GuangZhou Chemical Industry
基 金:吉林大学理论化学计算国家重点实验室开放课题基金资助(No:20130023)
摘 要:采用密度泛函方法对两种Ir(ppy)2(O^N)(ppy=2-苯基吡啶;O^N=2-(2-羟基苯)-苯并噻唑(1), O^N=2-(2-羟基苯)-苯并恶唑(2))配合物的几何结构和光谱特征进行了详细的理论研究。计算得到的Ir-N(1)、 Ir-N(3)和Ir-O(1)基态键长和相应实验值符合得较好。激发态下, Ir-N(1)和Ir-C(1)键长均增加了约0.02~0.05A,而Ir-O(1)键长则缩短了大约0.02?。在TD-DFT计算水平下结合极化连续介质( PCM)模型,得到1~2的最低能吸收和发射分别出现在484 nm(1)、441 nm (2)和624 nm(1)、519 nm(2)。1和2的此跃迁均属于[d(Ir)+π(ppy)+π(O^N)→π*(O^N)]的电荷转移跃迁。计算结果表明, ppy和O^N配体在跃迁过程中担当两个独立的发色团。与分子2相比,由于1在O^N配体上存在噻唑环,导致其分子整体结构变化较大,并使吸收和发射波长产生明显红移。The geometries and spectroscopic properties of a series of Ir (ppy)2(O^N)(ppy=2-phenylpyridine;O^N=2-(2-Hydroxyphenyl) -benzothiazole (1), O^N =2 -(2 -hydroxyphenyl) -benzoxazole (2)) were investigated theoretically.The calculated bond lengths of Ir-N(1), Ir-N(3) and Ir-O(1) in the ground state agreed well with the corresponding experimental results.Upon excitation, the bond lengths of Ir -N(1) and Ir-C(1) lengthen by 0.02-0.05 ?and that of Ir-O(1) shortened by 0.02?.At the TD-DFT level with the PCM model , 1-2 give rise to lowest -lying absorptions at 484(1), 441(2) nm and phosphorescent emissions at 624(1), 519(2) nm, respectively.The transitions of 1, 2 were attributed to [d(Ir)+π(ppy)+π(O^N)→π*(O^N)] charge transfer.The calculated results showed that the ppy and O^N groups acted as two independent chromospheres in transition processes.Compared with 2 , the geometric structure was greatly affected and the absorptions and emissions were red -shifted by benzothiazole groups on the O^N ligand of complexes 1.
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