Three bis-vinylpyridine compounds (4,4′-bis(2-vinylpyridine)biphenyl L1,4,4′-bis(3-vinylpyridine) biphenyl L2,and 4,4′-bis (4-vinylpyridine)biphenyl L3) were synthesized by one-step solid-state reactions at room temperature,giving nearly quantitative yields. The compounds obtained were fully characterized by IR,MS and NMR spectroscopies. The structures of L2 and L3 were determined by single crystal X-ray diffraction analysis. No noticeable solvatochromism was observed in either one-photon absorption or one-photon excited fluorescence spectra. All of the compounds have high fluorescence quantum yields and long fluorescence lifetime. The linear and nonlinear optical properties of the compounds were investigated both experimentally and theoretically. Interestingly,the position of the nitrogen atom from pyridine influences their two-photon absorption across-sections.
A novel mercury(n)complex HgL_2Br_2 was prepared from HgBr_2 and the organic ligand 2-(N-methyl-N-(4-((E)-2-(pyridine-4-yl)vinyl)phenyl)amino)ethanol(L).The ligand was synthesized and then characterized by FT-IR spectroscopy,~1H NMR,mass spectrum and elemental analysis,while the single-crystal diffraction data of the complex were collected on a Siemens Smart CCD diffractometer.The complex crystallizes in triclinic space group P_1^-with a=5.367(5),b= 12.466(5),c=23.945(5)(?),α=90.812(5),β=96.318(4),γ=96.093(5)°,Z=2,D_c=1.817g·cm^(-3),μ=7.395 mm^(-1),S=0.825,and the final R=0.0396.The Hg(Ⅱ)ion in the distorted tetrahedral mercury(Ⅱ)complex C_(32)H_(36)HgBr_2N_4O_2 is coordinated by two N atoms from the two ligands together with two bromide ions.Solid-state emission of the ligand and its complex has been investigated at room temperature.
WU Jie-Ying ZHOU Wen LI Wei-Jie ZHOU Hong-Ping TIAN Yu-Peng
A novel pyridine derivate,9-hexyl-3-((pyridin-4-yl)vinyl)-9H-carbazole,was synthesized and characterized by 1H NMR spectra and X-ray diffraction analysis.The complex crystallizes in monoclinic,space group P21/n with a=9.111(5),b=8.239(5),c=26.835(5) ,β=95.340(5)°,Mr=354.48,V=2005.6(17) 3,Z=4,Dc=1.174 g/cm3,μ=0.068 mm-1,F(000)=760,R=0.0565 and wR=0.1550 for 12635 observed reflections(Ⅰ>2σ(Ⅰ)).Density functional theory(DFT) calculations were carried out to interpret its UV-Vis spectra,and the results are in agreement with the available experiments.
