Two cobalt（Ⅱ） compounds,Co（2,2-bpy） 2 Br 2 （1,2,2-bpy=2,2-bipyridyl） and Co（1,10-phen） 2 Br 2 （2,1,10-phen=1,10-phenanthroline）,have been prepared under ionothermal reactions using the 1-propyl-3-methylimidazolium bromide ionic liquid solvent.Single-crystal X-ray analyses reveal that 1 crystallizes in a monoclinic space group P2 1 /c,with a=8.5509（13）,b=14.804（2）,c=15.650（2）,β=97.119（2） o,V=1965.8（5） 3,Z=4,C 20 H 16 Br 2 N 4 Co,M r=531.12,D c=1.795 g/cm 3,μ=4.950 mm-1,F（000）=1044,the final R=0.0467 and wR=0.0736 for 2291 observed reflections with I 2σ（Ⅰ）.Complex 2 crystallizes in a monoclinic space group P2 1 /n,with a=10.4237（8）,b=16.8657（12）,c=12.4945（9）b,β=102.110（1） o,V=2147.7（3） 3,Z=4,C 24 H 16 Br 2 N 4 Co,M r=579.16,D c=1.791 g/cm 3,μ=4.540 mm-1,F（000）=1140,the final R=0.0431 and wR=0.1042 for 3470 observed reflections with I 2σ（Ⅰ）.The mononuclear molecules of 1 are linked by the C-H···Br hydrogen bonds and π-π interactions to form a three-dimensional supramolecular framework structure.The C-H···Br hydrogen bonds and π-π interactions link the mononuclear molecules of 2 to give a two-dimensional layer structure.
