化学学报 ›› 2013, Vol. 71 ›› Issue (06): 906-912.DOI: 10.6023/A13030272 上一篇    下一篇

研究论文

卤离子导向合成配位聚合物[Hg2X4(ppt)]n (X=I和Br; ppt=1-(4-吡啶基)-吡啶铵-4-硫醇盐)及不同的一维链状结构和三阶非线性光学响应

倪春燕a,b, 陈阳a, 李端秀a, 任志刚a, 李红喜a, 孙真荣c, 郎建平a,b   

  1. a 苏州大学材料与化学化工学部 苏州 215123;
    b 中国科学院上海有机化学研究所金属有机化学国家重点实验室 上海 200032;
    c 华东师范大学物理系 上海 200062
  • 投稿日期:2013-03-14 发布日期:2013-05-02
  • 通讯作者: 郎建平,jplang@suda.edu.cn; 陈阳, chemsunnychan@gmail.com; Tel.: 0512-65882865; Fax: 0512-65880089 E-mail:jplang@suda.edu.cn;chemsunnychan@gmail.com
  • 基金资助:

    项目受国家自然科学基金(No. 21171124)及上海有机化学研究所金属有机化学重点实验室开放基金(No. 201201006)资助.

Halide-Directed Synthesis of Coordination Polymers [Hg2X4(ppt)]n (X=I and Br, ppt=1-(4-Pyridyl)-pyridinium-4-thiolate) with Different One-Dimensional Chain Structures and Third-Order Nonlinear Optical Properties

Ni Chunyana,b, Chen Yanga, Li Duanxiua, Ren Zhiganga, Li Hongxia, Sun Zhenrongc, Lang Jianpinga,b   

  1. a College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123;
    b State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032;
    c Department of Physics, East China Normal University, Shanghai 200062
  • Received:2013-03-14 Published:2013-05-02
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No. 21171124) and the State Key Laboratory of Organometallic Chemistry of Shanghai Institute of Organic Chemistry (No. 201201006).

通过HgX2 (X=I, Br)与4,4'-二吡啶基二硫化物(dpds)在乙腈中的溶剂热反应, 得到二个含1-(4-吡啶基)-吡啶铵-4-硫醇盐(ppt)的一维配位聚合物: [Hg2I4(ppt)]n (1)和[Hg2Br4(ppt)]n (2). 在化合物12结构中ppt配体是由dpds在溶剂热反应条件下通过dpds的S—S键和S—C键切断然后进行重排在原位形成的. 化合物1具有非中心对称的一维Z字型链状结构, 化合物2则具有中心对称的一维Z字型链状结构. 用飞秒简并四波混频法测定了12溶液的三阶非线性光学性质, 化合物1具有较强的非线性光学响应, 而化合物2却没有非线性光学响应, 这种性质的差异可能由于碘离子是较溴离子更好的电子授体, 化合物1有较小的HOMO-LUMO能级, 更易发生电子在体系间跃迁, 更有效使用三线激发态吸收.

关键词: 卤离子导向, 配位聚合物, 溶解热合成, 结构, 非线性光学

Solvothermal reactions of HgX2 (X=I, Br) with 4,4'-dipyridyl disulfide (dpds) in acetonitrile gave rise to two one-dimensional polymers [Hg2X4(ppt)]n [ppt=1-(4-pyridyl)-pyridinium-4-thiolate; X=I (1), Br (2)]. In the structures of 1 and 2, the ppt ligand was in situ generated from the Hg(II)-engaged cleavage of both S—S and S—C bonds of dpds and the subsequent rearrangement reactions under solvothermal conditions. Although compounds 1 and 2 have similar chemical formula, 1 crystallizes in the orthorhombic space group Ima2 and holds a 1D non-centrosymmetric zigzag chain while 2 crystallizes in the orthorhombic space group Pnma and has a 1D centrosymmetric zigzag chain. Such a difference in structural symmetry between 1 and 2 may be due to the fact that the radius of iodide is larger than that of bromide. The third-order nonlinear optical (NLO) behaviours of 1 and 2 in DMF were investigated by using femtosecond degenerate four-wave mixing technique. Compound 1 exhibited relatively strong NLO responses while compound 2 showed nothing. Such a remarkable difference in the NLO property may be due to the fact that iodide is a better electron donor than bromide, which allows more efficient spin-orbital coupling, and facilitates intersystem crossing and more efficient usage of triplet excited state absorption.

Key words: halide-directed, coordination polymer, solvothermal synthesis, structure, nonlinear optical properties