Two supramolecular compounds [Cu（imz）2][Cu（phen）（imz）]2{[Cu（phen）]2[PMo6^VIMo6^VV2^IVO42]}（1） and [Co2（2,2＇-bpy）4（C2O4）][Co（2,2＇-bpy）3][PMo7^VIMo5^VV2^IVO42]（2,2＇-bpy）0.5.H2O（2）（phen=1,10＇-phe...Two supramolecular compounds [Cu（imz）2][Cu（phen）（imz）]2{[Cu（phen）]2[PMo6^VIMo6^VV2^IVO42]}（1） and [Co2（2,2＇-bpy）4（C2O4）][Co（2,2＇-bpy）3][PMo7^VIMo5^VV2^IVO42]（2,2＇-bpy）0.5.H2O（2）（phen=1,10＇-phenanthroline, imz= imidazole, 2,2＇-bpy=2.2＇-bipyridine） have been synthesized hydrothermally and characterized by elemental analyses, infrared spectrum, UV-Vis, X-ray photoelectron spectroscopy（XPS）, electron spin resonance（ESR） spectra, thermogravimetry analyses and single crystal X-ray diffraction analyses. Single-crystal X-ray diffraction analyses revealed that both the compounds represent the examples of compounds based on the bi-capped Keggin polyoxoanion {PMo12V2O42} and transition metal mixed-organic-ligand coordination complexes. Compound 1 consists of bi-capped Keggin polyoxoanion [PMo12V2O42]5 supported copper coordination groups, which are further interconnected with two types of copper complex fragments forming a 3D supramolecular framework via π-π stacking, C-H…O and N-H…-O hydrothermal bonding interactions. Compound 2 is a new hybrid consisted of polyoxoanion [PMo12V2O42]^4-, [Co2（2,2＇-bpy）4（C2O4）]^2＋ and [Co（2,2＇-bpy）3]^2＋. There are no direct interactions in compound 2, but the polyoxoanions together with two different cobalt complex groups construct a 3D supramolecular network through C-H…O hydrogen bonding interactions.展开更多
The structures and stabilization of three crystal surfaces of TCNQ-based charge transfer complexes（CTCs） including PrQ（TCNQ） 2,MPM（TCNQ） 2,and MEM（TCNQ） 2,have been investigated by scanning tunneling microscop...The structures and stabilization of three crystal surfaces of TCNQ-based charge transfer complexes（CTCs） including PrQ（TCNQ） 2,MPM（TCNQ） 2,and MEM（TCNQ） 2,have been investigated by scanning tunneling microscopy（STM）.The three bulk-truncated surfaces are all ac-surface,which are terminated with TCNQ molecular arrays.On the ac-surface of PrQ（TCNQ） 2,the TCNQ molecules form a tetramer structure with a wavelike row behavior and a 纬 angle of about 18掳 between adjacent molecules.Moreover,the dimer structures are resolved on both ac-surfaces of MPM（TCNQ） 2 and MEM（TCNQ） 2.In addition,the tetramer structure is the most stable structure,while the dimer structures are unstable and easily subject to the STM tip disturbance,which results in changeable unit cells.The main reasons for the surface stabilization variation among the three ac-surfaces are provided by using the ＇蟺-atom model＇.展开更多
基金Supported by the National Natural Science Foundation of China（No.21371066）.
文摘Two supramolecular compounds [Cu（imz）2][Cu（phen）（imz）]2{[Cu（phen）]2[PMo6^VIMo6^VV2^IVO42]}（1） and [Co2（2,2＇-bpy）4（C2O4）][Co（2,2＇-bpy）3][PMo7^VIMo5^VV2^IVO42]（2,2＇-bpy）0.5.H2O（2）（phen=1,10＇-phenanthroline, imz= imidazole, 2,2＇-bpy=2.2＇-bipyridine） have been synthesized hydrothermally and characterized by elemental analyses, infrared spectrum, UV-Vis, X-ray photoelectron spectroscopy（XPS）, electron spin resonance（ESR） spectra, thermogravimetry analyses and single crystal X-ray diffraction analyses. Single-crystal X-ray diffraction analyses revealed that both the compounds represent the examples of compounds based on the bi-capped Keggin polyoxoanion {PMo12V2O42} and transition metal mixed-organic-ligand coordination complexes. Compound 1 consists of bi-capped Keggin polyoxoanion [PMo12V2O42]5 supported copper coordination groups, which are further interconnected with two types of copper complex fragments forming a 3D supramolecular framework via π-π stacking, C-H…O and N-H…-O hydrothermal bonding interactions. Compound 2 is a new hybrid consisted of polyoxoanion [PMo12V2O42]^4-, [Co2（2,2＇-bpy）4（C2O4）]^2＋ and [Co（2,2＇-bpy）3]^2＋. There are no direct interactions in compound 2, but the polyoxoanions together with two different cobalt complex groups construct a 3D supramolecular network through C-H…O hydrogen bonding interactions.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.10804010,50772015,60977015,and 10974019)the National Basic Research Program of China(Grant No.2006CB932301)the Scientific Research Foundation for the Returned Overseas Chinese Scholars of Ministry of Education
文摘The structures and stabilization of three crystal surfaces of TCNQ-based charge transfer complexes（CTCs） including PrQ（TCNQ） 2,MPM（TCNQ） 2,and MEM（TCNQ） 2,have been investigated by scanning tunneling microscopy（STM）.The three bulk-truncated surfaces are all ac-surface,which are terminated with TCNQ molecular arrays.On the ac-surface of PrQ（TCNQ） 2,the TCNQ molecules form a tetramer structure with a wavelike row behavior and a 纬 angle of about 18掳 between adjacent molecules.Moreover,the dimer structures are resolved on both ac-surfaces of MPM（TCNQ） 2 and MEM（TCNQ） 2.In addition,the tetramer structure is the most stable structure,while the dimer structures are unstable and easily subject to the STM tip disturbance,which results in changeable unit cells.The main reasons for the surface stabilization variation among the three ac-surfaces are provided by using the ＇蟺-atom model＇.
