Two cyanide bridged trinuclear compounds [Fe（bpy）2（CN）2]·[Cu（Cyclam）]2（ClO4）4·DMF 1 and [Fe（Phen）2（CN）2]·[Cu（Cyclam）]2（ClO4）4·2CH3CN·4H2O 2 （Bpy = 2,2＇- bipyridine, Phen = 1,...Two cyanide bridged trinuclear compounds [Fe（bpy）2（CN）2]·[Cu（Cyclam）]2（ClO4）4·DMF 1 and [Fe（Phen）2（CN）2]·[Cu（Cyclam）]2（ClO4）4·2CH3CN·4H2O 2 （Bpy = 2,2＇- bipyridine, Phen = 1,10-phenanthroline, Cyclam = 1,4,8,11-tetraaza-cyclotetradecane, and DMF = N,N-dimethylformamide） have been synthesized by using mononuclear [Fe（Phen）2（CN）2]·2H2O and [Fe（bpy）2（CN）2]·3H2O as precursors. These two complexes crystallize in monoclinic space groups P21/c and C2/c, respectively. For 1, a = 25.164（2）, b = 12.0405（11）, c = 20.4433（15） A, β = 91.948（3）°, V = 6190.5（9） A^3, Z = 4, Mr = 1418.90, Dc = 1.522 g/cm^3, F（000） = 2936, μ = 1.161 mm^-1, the final R = 0.0722 and wR = 0.2011 for 10779 observed reflections （I 〉 2σ（I））. For 2, a = 43.5945（0）, b = 11.8447（0）, c = 29.5637（2）A, β = 120.430（11）o, V = 13162.76（9） A^3, Z = 8, Mr = 1518.48, Dc = 1.533 g/cm^3, F（000） = 6288, μ = 1.101 mm^-1, the final R = 0.0711 and wR = 0.1783 for 11262 observed reflections （I 〉 2σ（I））.展开更多
A method for the synthesis of a new class of anisotropic mesostructured gold material,which we call“mesoflowers”,is demonstrated.The mesoflowers,unsymmetrical at the single particle level,resemble several natural ob...A method for the synthesis of a new class of anisotropic mesostructured gold material,which we call“mesoflowers”,is demonstrated.The mesoflowers,unsymmetrical at the single particle level,resemble several natural objects and are made up of a large number of stems with unusual pentagonal symmetry.The mesostructured material has a high degree of structural purity with star-shaped,nano-structured stems.The mesoflowers were obtained in high yield,without any contaminating structures and their size could be tuned from nano-to meso-dimensions.The dependence of various properties of the mesoflowers on their conditions of formation was studied.The near-infrared infrared(NIR IR)absorption exhibited by the mesoflowers has been used for the development of infrared filters.Using a prototypical device,we demonstrated the utility of the gold mesoflowers in reducing the temperature rise in an enclosure exposed to daylight in peak summer.These structures showed a high degree of surface-enhanced Raman scattering(SERS)activity compared to spherical analogues.SERS-based imaging of a single mesoflower is demonstrated.The high SERS activity and NIR IR absorption property open up a number of exciting applications in diverse areas.展开更多
基金Supported by the 973 Program (2007CB815301 and 2006CB932904)the National Natural Science Foundation of China (20333070, 20871114 and 20673118)+1 种基金the Science Foundation of CAS (KJCX2-YW-M05)Fujian Province (2006F3132 and 2007J0171)
文摘Two cyanide bridged trinuclear compounds [Fe（bpy）2（CN）2]·[Cu（Cyclam）]2（ClO4）4·DMF 1 and [Fe（Phen）2（CN）2]·[Cu（Cyclam）]2（ClO4）4·2CH3CN·4H2O 2 （Bpy = 2,2＇- bipyridine, Phen = 1,10-phenanthroline, Cyclam = 1,4,8,11-tetraaza-cyclotetradecane, and DMF = N,N-dimethylformamide） have been synthesized by using mononuclear [Fe（Phen）2（CN）2]·2H2O and [Fe（bpy）2（CN）2]·3H2O as precursors. These two complexes crystallize in monoclinic space groups P21/c and C2/c, respectively. For 1, a = 25.164（2）, b = 12.0405（11）, c = 20.4433（15） A, β = 91.948（3）°, V = 6190.5（9） A^3, Z = 4, Mr = 1418.90, Dc = 1.522 g/cm^3, F（000） = 2936, μ = 1.161 mm^-1, the final R = 0.0722 and wR = 0.2011 for 10779 observed reflections （I 〉 2σ（I））. For 2, a = 43.5945（0）, b = 11.8447（0）, c = 29.5637（2）A, β = 120.430（11）o, V = 13162.76（9） A^3, Z = 8, Mr = 1518.48, Dc = 1.533 g/cm^3, F（000） = 6288, μ = 1.101 mm^-1, the final R = 0.0711 and wR = 0.1783 for 11262 observed reflections （I 〉 2σ（I））.
基金We thank Department of Science and Technology,Government of India for constantly supporting our research program on nanomaterials.
文摘A method for the synthesis of a new class of anisotropic mesostructured gold material,which we call“mesoflowers”,is demonstrated.The mesoflowers,unsymmetrical at the single particle level,resemble several natural objects and are made up of a large number of stems with unusual pentagonal symmetry.The mesostructured material has a high degree of structural purity with star-shaped,nano-structured stems.The mesoflowers were obtained in high yield,without any contaminating structures and their size could be tuned from nano-to meso-dimensions.The dependence of various properties of the mesoflowers on their conditions of formation was studied.The near-infrared infrared(NIR IR)absorption exhibited by the mesoflowers has been used for the development of infrared filters.Using a prototypical device,we demonstrated the utility of the gold mesoflowers in reducing the temperature rise in an enclosure exposed to daylight in peak summer.These structures showed a high degree of surface-enhanced Raman scattering(SERS)activity compared to spherical analogues.SERS-based imaging of a single mesoflower is demonstrated.The high SERS activity and NIR IR absorption property open up a number of exciting applications in diverse areas.
