Three new compounds, [MnL(2,2΄-bipy)2]n·1.5nH2O (1), Co(4,4ˊ-bipy)(H2O)4·2HL (2) and 2HL·(4,4ˊ-bipyH)·2H2O (3) (H2L = 2,2΄-dithiosalicylic acid, 2,2΄-bipy = 2, 2΄-bipyridine, 4,4΄-bipy = 4,4΄-bipyridine), have been synthesized by hydrothermal and evaporation methods. Structural determination reveals that compound 1 shows a one-dimensional chain structure with L2- ligands adopting bridging coordination modes, compound 2 features a mononuclear structure with uncoordinated HL- anions, balancing the charges, compound 3 is a new inclusion compound of HL- anions and 4,4ˊ-bipyH cation with π-π stacking interactions. In compounds 1-3, the flexible S-S linkages can make H2L ligands present different conformations of dihedral angles between the terminal benzene rings. The S-O hypervalent bonds can stabilize the conformations. Thermogravimetric analyses and fluorescence measurements of compounds 1 and 2 have been performed. Compounds 1 and 2 exhibit broad blue fluorescent emission bands at 420 nm and 424 nm, respectively.

中文翻译：

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基于具有 SS 柔性键的二羧酸配体的三种化合物的合成、晶体结构和性质

三种新化合物，[MnL(2,2΄-bipy)2]n·1.5nH2O (1), Co(4,4ˊ-bipy)(H2O)4·2HL (2) 和 2HL·(4,4ˊ-bipyH )·2H2O (3) (H2L = 2,2΄-二硫代水杨酸, 2,2΄-bipy = 2, 2΄-bipyridine, 4,4΄-bipy = 4,4΄-bipyridine),水热法和蒸发法。结构测定表明，化合物1为一维链状结构，L2-配体采用桥接配位模式，化合物2为单核结构，HL-阴离子未配位，平衡电荷，化合物3是HL-阴离子的新型包合物，具有 π-π 堆积相互作用的 4,4ˊ-bipyH 阳离子。在化合物 1-3 中，灵活的 SS 键可以使 H2L 配体在末端苯环之间呈现不同的二面角构象。SO高价键可以稳定构象。已对化合物 1 和 2 进行了热重分析和荧光测量。化合物 1 和 2 分别在 420 nm 和 424 nm 处表现出宽的蓝色荧光发射带。