Effect of solvent on the architectures of six Ag(I) coordination polymers based on flexible and quasi-flexible organic nitrogen donor ligands

• Published in: Polyhedron 2016-02, Vol.106, p.178-186
• Main Authors: Yuan, Yuan, Xue, Xiao-Nan, Fan, Wei-Wei, Qiu, Qi-Ming, Cui, Yang-Zhe, Liu, Min, Li, Zhong-Feng, Jin, Qiong-Hua, Yang, Yu-Ping, Zhang, Zhen-Wei, Geng, Wen-Xiao, Zheng, Wen-Jie
• Format: Article
• Language: English
• Subjects: 1,2-Bis(4-pyridyl)ethylene; 1,3-Bis(4-pyridyl)propane; Silver(I) complexes; Terahertz spectra; Triphenylphosphine
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2015.12.053

Compounds 1–6 were fully characterized by IR, 1H and 31P NMR spectroscopy, elemental analysis, fluorescence, THz spectra and single-crystal X-ray crystallography. The crystal structures of complexes 1–2, 4–6 consist of topological networks. In addition, complexes 1–6 exhibit interesting fluorescence in the solid state at room temperature. [Display omitted] The present work describes the synthesis, full characterization and architectural diversity of six new bioactive silver–organic networks, namely the coordination polymers [Ag(bpa)2(CF3SO3)(H2O)]n (1), {[Ag2(PPh3)2(bpa)2](CF3SO3)}n (2), [Ag(bpe)(CF3SO3)]n (3), [Ag(bpe)(CF3SO3)(CH3CN)]n (4), {[Ag(PPh3)(μ-bpe)]1.5(BF4)}n (5) and [Ag(bpp)(CF3SO3)(CH3CN)2]n (6), which are generated via a mixed-ligand strategy using 1,2-bis(4-pyridyl)ethane (bpa), 1,2-bis(4-pyridyl)ethene (bpe) or 1,3-bis(4-pyridyl)propane (bpp) as the main building block and triphenylphosphine (PPh3) as an ancillary ligand source. Complexes 1–6 were well characterized by IR, 1H and 31P NMR spectroscopy, elemental analysis, fluorescence, THz spectroscopy and single-crystal X-ray crystallography. The complexes 1, 2 and 4–6 have a topological network structure. The type and coordination modes of the bipyridine derivatives and the choice of solvent play a key role in defining the dimensionality as well as the structural and topological features of the resulting networks. Analysis of structures revealed that complex 1 possesses a (54, 62) topological network structure connected through the bridging ligand bpa. Complex 2 has a dinuclear structure and displays a topologically promising architecture connected through hydrogen bonds between the CH groups of aromatic ring and anions. Complexes 3 and 4 possess different 1D infinite chains which are linked by the bridging ligand bpe, and complex 4 can be simplified as having a three-dimensional mesh topology. Complex 5 has a (93, 33) topological network structure connected through the bridging ligand bpe. Like complex 4, complex 6 possesses 1D infinite chains through the bridging ligand bpp, which are linked by hydrogen bonds to form a 3D topological network. Complexes 2 and 4 are generated from CH2Cl2/CH3OH (5:5) and CH3CN respectively, while the other complexes are obtained from CH3CN/H2O (5:5). In addition, complexes 1–6 exhibit interesting fluorescence in the solid state at room temperature.