Two new coordination polymers,named {[Co3(pfca)6(phen)2]·2H2O}n(1) and[Cu(pfca)2(4,4'-bpy)(H2O)]n(2)(Hpfca = 4-fluorocinnamic acid and 4,4-bpy = 4,4-bipyridine),were hydrothermally synthesized an...Two new coordination polymers,named {[Co3(pfca)6(phen)2]·2H2O}n(1) and[Cu(pfca)2(4,4'-bpy)(H2O)]n(2)(Hpfca = 4-fluorocinnamic acid and 4,4-bpy = 4,4-bipyridine),were hydrothermally synthesized and characterized by elemental analysis,IR spectroscopy,thermogravimetric analysis(TGA),and single-crystal X-ray diffraction.Complex 1 crystallizes in the triclinic crystal system,space group P1 with a = 10.939(3),b = 12.430(4),c = 13.815(4) A,α=78.436(3),β= 70.261(3),γ= 80.268(3)°,V= 1721.8(9) A^3,Dc = 1.508 g/cm^3,Mr= 1564.06,Z = 1,F(000) = 799,μ= 0.802 mm^(-1),the final R = 0.0432 and wR = 0.1015 for 13250 observed reflections with I 2σ(I).Complex 2 is of monoclinic system,space group P2/lc with a =15.4985(14),b = 15.8424(14),c = 10.9528(10) A,β= 107.1600(10)°,V= 2569.6(4) A^3,Dc = 1.468g/cm^3,Mr = 568.02,Z = 4,F(000) = 1164,μ= 0.906 mm^(-1),the final R = 0.0371 and wR = 0.0842 for 18183 observed reflections with I〉 2σ(I).Complex 1 features linear Co(Ⅱ)-trinuclear units,which are assembled into a final 3D supramolecular structure through π…π stacking interactions and F-H weak interactions.Complex 2 consists of 1D polymeric Cu(Ⅱ)-chains that are further cohered together by extensive H-bonds.展开更多
采用Co_(3)O_(4)吸附脱除模拟柴油中的喹啉、吡啶或苯胺,考察了最佳吸附温度、吸附时间等条件,同时进行了吸附热力学和动力学研究;基于第一性原理对Co_(3)O_(4)晶胞进行相分析,对3种氮化物进行最高占据分子轨道(HOMO)-最低未占据分子轨...采用Co_(3)O_(4)吸附脱除模拟柴油中的喹啉、吡啶或苯胺,考察了最佳吸附温度、吸附时间等条件,同时进行了吸附热力学和动力学研究;基于第一性原理对Co_(3)O_(4)晶胞进行相分析,对3种氮化物进行最高占据分子轨道(HOMO)-最低未占据分子轨道(LUMO)分析,计算了吸附构型的吸附能和最稳定吸附构型的Mulliken电荷转移与电子密度。结果表明:在15 mL模拟柴油中加入0.6 g Co_(3)O_(4),苯胺、吡啶、喹啉的最佳吸附温度分别为20、20和30℃,最佳吸附时间分别为30、30、40 min,吸附容量由大到小顺序均为苯胺>吡啶>喹啉。热力学与动力学分析表明,喹啉、吡啶、苯胺的吸附均更符合多分子层吸附的Freundlich模型和准二级动力学方程。HOMO-LUMO分析结果表明,Co_(3)O_(4)为电子接受体,3种氮化物为电子给予体,Co_(3)O_(4)对喹啉、吡啶的配位吸附结构最稳定,对苯胺的π络合吸附最稳定。电荷转移计算表明,苯胺、吡啶、喹啉向Co_(3)O_(4)团簇转移的电荷数分别为0.423、0.394、0.368,说明Co_(3)O_(4)吸附3种氮化物的吸附能力大小为苯胺>吡啶>喹啉;电子密度图结果表明,最稳定吸附结构中Co_(3)O_(4)与3种氮化物均形成了化学键。展开更多
基金Supported by the Program for Science&Technology Innovation Talents in Universities of Henan Province(No.14HASTIT017)the Program for Innovative Research Team(in Science and Technology)in University of Henan Province(No.14IRTSTHN008)+1 种基金the Foundation of Education Committee of Henan Province(No.142300410301)the National Natural Science Foundation of China(No.21571093)
文摘Two new coordination polymers,named {[Co3(pfca)6(phen)2]·2H2O}n(1) and[Cu(pfca)2(4,4'-bpy)(H2O)]n(2)(Hpfca = 4-fluorocinnamic acid and 4,4-bpy = 4,4-bipyridine),were hydrothermally synthesized and characterized by elemental analysis,IR spectroscopy,thermogravimetric analysis(TGA),and single-crystal X-ray diffraction.Complex 1 crystallizes in the triclinic crystal system,space group P1 with a = 10.939(3),b = 12.430(4),c = 13.815(4) A,α=78.436(3),β= 70.261(3),γ= 80.268(3)°,V= 1721.8(9) A^3,Dc = 1.508 g/cm^3,Mr= 1564.06,Z = 1,F(000) = 799,μ= 0.802 mm^(-1),the final R = 0.0432 and wR = 0.1015 for 13250 observed reflections with I 2σ(I).Complex 2 is of monoclinic system,space group P2/lc with a =15.4985(14),b = 15.8424(14),c = 10.9528(10) A,β= 107.1600(10)°,V= 2569.6(4) A^3,Dc = 1.468g/cm^3,Mr = 568.02,Z = 4,F(000) = 1164,μ= 0.906 mm^(-1),the final R = 0.0371 and wR = 0.0842 for 18183 observed reflections with I〉 2σ(I).Complex 1 features linear Co(Ⅱ)-trinuclear units,which are assembled into a final 3D supramolecular structure through π…π stacking interactions and F-H weak interactions.Complex 2 consists of 1D polymeric Cu(Ⅱ)-chains that are further cohered together by extensive H-bonds.
文摘采用Co_(3)O_(4)吸附脱除模拟柴油中的喹啉、吡啶或苯胺,考察了最佳吸附温度、吸附时间等条件,同时进行了吸附热力学和动力学研究;基于第一性原理对Co_(3)O_(4)晶胞进行相分析,对3种氮化物进行最高占据分子轨道(HOMO)-最低未占据分子轨道(LUMO)分析,计算了吸附构型的吸附能和最稳定吸附构型的Mulliken电荷转移与电子密度。结果表明:在15 mL模拟柴油中加入0.6 g Co_(3)O_(4),苯胺、吡啶、喹啉的最佳吸附温度分别为20、20和30℃,最佳吸附时间分别为30、30、40 min,吸附容量由大到小顺序均为苯胺>吡啶>喹啉。热力学与动力学分析表明,喹啉、吡啶、苯胺的吸附均更符合多分子层吸附的Freundlich模型和准二级动力学方程。HOMO-LUMO分析结果表明,Co_(3)O_(4)为电子接受体,3种氮化物为电子给予体,Co_(3)O_(4)对喹啉、吡啶的配位吸附结构最稳定,对苯胺的π络合吸附最稳定。电荷转移计算表明,苯胺、吡啶、喹啉向Co_(3)O_(4)团簇转移的电荷数分别为0.423、0.394、0.368,说明Co_(3)O_(4)吸附3种氮化物的吸附能力大小为苯胺>吡啶>喹啉;电子密度图结果表明,最稳定吸附结构中Co_(3)O_(4)与3种氮化物均形成了化学键。