First metal-organic coordination polymer based on the[{Mo_(6)I_(8)}(CN)_(6)]^(2-)cluster anion was obtained using the salts Cs_(1.3)Na_(0.7)[{Mo_(6)I_(8)}(CN)_(6)]·2H_(2)O(1)and K[Ag(CN)_(2)],as well as bis(diphe...First metal-organic coordination polymer based on the[{Mo_(6)I_(8)}(CN)_(6)]^(2-)cluster anion was obtained using the salts Cs_(1.3)Na_(0.7)[{Mo_(6)I_(8)}(CN)_(6)]·2H_(2)O(1)and K[Ag(CN)_(2)],as well as bis(diphenylphosphino)methane(dppm),as precursors.In contrast to the previously reported coordination polymers based on octahedral cyanide cluster complexes,the 1D polymer[{Ag_(2)(dppm)_(2)}{Mo_(6)I_(8)}(CN)_(6)](2)demonstrated an order of magnitude increase in the cluster-centred photoluminescence quantum yield(Φem)in the solid state at 300 K in comparison with the ionic salt 1.Moreover,2 exhibits bright X-ray-induced emission,which is two orders of magnitude more intense than that of 1 and is characterized by a light yield of 10800 photons per MeV.Therefore,2 represents the first effective scintillating compound based on octahedral molybdenum clusters.The polymer has exceptional thermal,photo-and hydrolytic stability and exhibits minimal degradation upon X-ray irradiation,retaining its emission intensity following exposure to the dose of 2.2×10^(5) rad.It should be noted that this level of radiation resistance is superb even for inorganic scintillation materials.The high light yield and exceptional stability of the compound enabled us to use it to manufacture scintillation screens for X-ray visualisation.These screens provide a spatial resolution of up to 9 line pairs per mm,representing the first example of a scintillation device based on molybdenum clusters.展开更多
The present study has been carried out to determine the chromian spinel and platinum group elements(PGEs)geochemistry of podiform chromitites of Dargai Complex which provides significant information regarding the mant...The present study has been carried out to determine the chromian spinel and platinum group elements(PGEs)geochemistry of podiform chromitites of Dargai Complex which provides significant information regarding the mantlecrust transition zone(MTZ)to mantle section during the emplacement and genesis of ophiolitic complexes.The mineral chemistry and platinum group elements(PGEs)were analysed using the Electron Probe Micro Analyzer(EPMA)and inductively-coupled plasma mass spectrometer(ICP-MS).Chromian spinels in the high-Cr chromitites(Cr#>60),harzburgite and mantle dunites have much higher Cr#values in the range of 78.4 to 81.9,72.2 to 77.5 and 79.8 to 82.6,respectively.However,the chromian spinels in the high-Al chromitites(Cr#<60)and MTZ dunites have much lower Cr#values in the range of 47.5 to 52.9 and 46.7 to 49.4,respectively.Based on behaviours of PGEs,the chemical differences are reflected in these two types of chromitites.展开更多
基金supported by the Russian Science Foundation(project 19-73-20196-P)Measurements were performed at the“Center for Optical and Laser Materials Research”(St Petersburg State University,St Petersburg,Russian Federation)the Russian Science Foundation(project 22-73-10226)for the financial support of X-ray-induced emission light output measurements and the preparation and characterization of scintillation screens for X-ray visualization.
文摘First metal-organic coordination polymer based on the[{Mo_(6)I_(8)}(CN)_(6)]^(2-)cluster anion was obtained using the salts Cs_(1.3)Na_(0.7)[{Mo_(6)I_(8)}(CN)_(6)]·2H_(2)O(1)and K[Ag(CN)_(2)],as well as bis(diphenylphosphino)methane(dppm),as precursors.In contrast to the previously reported coordination polymers based on octahedral cyanide cluster complexes,the 1D polymer[{Ag_(2)(dppm)_(2)}{Mo_(6)I_(8)}(CN)_(6)](2)demonstrated an order of magnitude increase in the cluster-centred photoluminescence quantum yield(Φem)in the solid state at 300 K in comparison with the ionic salt 1.Moreover,2 exhibits bright X-ray-induced emission,which is two orders of magnitude more intense than that of 1 and is characterized by a light yield of 10800 photons per MeV.Therefore,2 represents the first effective scintillating compound based on octahedral molybdenum clusters.The polymer has exceptional thermal,photo-and hydrolytic stability and exhibits minimal degradation upon X-ray irradiation,retaining its emission intensity following exposure to the dose of 2.2×10^(5) rad.It should be noted that this level of radiation resistance is superb even for inorganic scintillation materials.The high light yield and exceptional stability of the compound enabled us to use it to manufacture scintillation screens for X-ray visualisation.These screens provide a spatial resolution of up to 9 line pairs per mm,representing the first example of a scintillation device based on molybdenum clusters.
基金supported by a grant from the National Natural Science Foundation of China(No.41325007)State Key Laboratory of Geological Processes and Mineral Resources(MSFGPMR03)during the PhD studies of the first author in the China University of Geosciences,Wuhan,China.
文摘The present study has been carried out to determine the chromian spinel and platinum group elements(PGEs)geochemistry of podiform chromitites of Dargai Complex which provides significant information regarding the mantlecrust transition zone(MTZ)to mantle section during the emplacement and genesis of ophiolitic complexes.The mineral chemistry and platinum group elements(PGEs)were analysed using the Electron Probe Micro Analyzer(EPMA)and inductively-coupled plasma mass spectrometer(ICP-MS).Chromian spinels in the high-Cr chromitites(Cr#>60),harzburgite and mantle dunites have much higher Cr#values in the range of 78.4 to 81.9,72.2 to 77.5 and 79.8 to 82.6,respectively.However,the chromian spinels in the high-Al chromitites(Cr#<60)and MTZ dunites have much lower Cr#values in the range of 47.5 to 52.9 and 46.7 to 49.4,respectively.Based on behaviours of PGEs,the chemical differences are reflected in these two types of chromitites.
