Crystal Structures and Photoluminescence of Two Zinc（Ⅱ） and Silver（Ⅰ） Complexes with 6,7-Dicyanodipyridoquinoxaline

摘要

Two d10 metal-organic complexes, [ZnBr2（DICNQ）2] （1） and [AgCN（DICNQ）]2（2）, were prepared from ZnBr2 and AgCN with 6,7-dicyanodipyridoquinoxaline （DICNQ） by solvothermal reactions, respectively, and characterized by single-crystal X-ray diffraction analyses, IR spectroscopy, and photoluminescent measurement. Compound 1 crystallizes in monoclinic, space group C2/c with a=8.436（2）, b=13.011（3）, c=27.565（6）,β=97.90（3） , V=2997.0（1）3 , Z=4, Mr=789.73, Dc=1.750 g/cm3 ,μ=3.533 mm-1 , F（000）=1552, S=1.007 and T=293（2） K. The final R=0.0739 and wR=0.1380 for 1561 observed reflections with I 〉 2σ（I）. Compound 2 crystallizes in monoclinic, space group P21/c with a=24.202（6）, b=7.1619（17）, c=18.339（5）,β=111.8380（10） , V=2950.6（1）3 , Z=4, Mr=832.32, Dc=1.874 g/cm 3 ,μ=1.382 mm-1 , F（000）=1632, S=1.002 and T=293（2） K. The final R=0.0389 and wR=0.1257 for 4812 observed reflections with I 〉 2σ（I）. Both compounds form packing structures by π…π stacking interactions and C-H…N or C-H…Br hydrogen-bonding interactions. Compounds 1 and 2 show similar photoluminescent spectra with emission maxima at ca. 430 nm in diluted acetonitrile solution （1×10-5 mol L-1 ） at room temperature.