The non-toxic and magnetically separable nano-CuFeOcatalyzed synthesis of symmetrical aryl sulfides by the reaction of thiourea with a wide variety of aryl halides,including aryl chlorides has been reported.Excellent ...The non-toxic and magnetically separable nano-CuFeOcatalyzed synthesis of symmetrical aryl sulfides by the reaction of thiourea with a wide variety of aryl halides,including aryl chlorides has been reported.Excellent yields of products have been obtained under ligand-free conditions and without the use of any expensive catalyst,such as palladium.展开更多
Ge_(2)Sb_(2)Se_(4)Te_(1),a newly developed phase change material derived from Ge_(2)Sb_(2)Te_(5),has garnered significant interest among researchers due to its numerous advantages.Here,its phase change characteristics...Ge_(2)Sb_(2)Se_(4)Te_(1),a newly developed phase change material derived from Ge_(2)Sb_(2)Te_(5),has garnered significant interest among researchers due to its numerous advantages.Here,its phase change characteristics under the electron beam evaporation method are thoroughly investigated,and a layered tunable color structure is proposed.Based on the low intrinsic absorption of Ge_(2)Sb_(2)Se_(4)Te_(1) material,it exhibits excellent dynamic tunability along with vivid color appearance including high brightness and high purity.In experiments,five representative colors—red,green,blue,yellow,and purple—were successfully prepared.The peak reflection of these samples averaged 92%,and when heated to 320°C,the temperature at which the phase transition of Ge_(2)Sb_(2)Se_(4)Te_(1) occurred,reflection loss was barely observed.In addition,after phase transition,the sideband reflection at non-target wavelengths decreased by 30%,bringing high-purity crystalline-state colors and noticeable color changes.Therefore,it is believed that the structural color scheme proposed here will contribute to the development of many fields including smart glasses,artificial retinal devices,high-resolution displays,and beyond.展开更多
A series of chalcogenide compounds with various compositions,i.e.,octanuclear or tetranuclear Zn-S clusters,have been synthesised in a straighforward manner.Different fused-ring aromatic ligands were used as capping l...A series of chalcogenide compounds with various compositions,i.e.,octanuclear or tetranuclear Zn-S clusters,have been synthesised in a straighforward manner.Different fused-ring aromatic ligands were used as capping ligands and the corresponding zero-dimensional(0D)products were obtained.On the other hand,use of bridging ligands led to a family of one-dimensional(1D)coordination polymers,and an in situ ligand reaction has been observed in[Zn_(8)S(SC_(6)H_(5))_(13)L_(1)(H_(2)O)]·2H_(2)O(L=3-carboxypryidyl)due to the hydrolysis of the cyano group of 3-pyridinecarbonitrile.A very rare 1D helical-chain structure was observed in[Zn_(4)(SC_(6)H_(5))_(8)L_(1)](L=4,4’-bipyridyl),providing evidence of the character of bridging organic ligands in the corresponding crystalline materials.First-principles calculations on[Zn_(4)(SC_(6)H_(5))_(8)L_(1)](L=4,4’-bipyridyl)further revealed that the two cluster units could rotate freely about the C-C single bond over a broad range,eventually leading to the formation of a one-dimensional helical structure.展开更多
基金the funding support received for this project from the Isfahan University of Technology(1UT),IR Iran (A.R.H.) and Grant GM 33138(A.E.R.)the National Institutes of Health,USA.Further financial support from the Center of Excellency in Chemistry Research(IUT)
文摘The non-toxic and magnetically separable nano-CuFeOcatalyzed synthesis of symmetrical aryl sulfides by the reaction of thiourea with a wide variety of aryl halides,including aryl chlorides has been reported.Excellent yields of products have been obtained under ligand-free conditions and without the use of any expensive catalyst,such as palladium.
基金supported by the National Key Research and Development Program of China(No.2020YFC2200403)the National Natural Science Foundation of China(No.62375231)the Fujian Province Science and Technology Planning Project(No.2022H6015).
文摘Ge_(2)Sb_(2)Se_(4)Te_(1),a newly developed phase change material derived from Ge_(2)Sb_(2)Te_(5),has garnered significant interest among researchers due to its numerous advantages.Here,its phase change characteristics under the electron beam evaporation method are thoroughly investigated,and a layered tunable color structure is proposed.Based on the low intrinsic absorption of Ge_(2)Sb_(2)Se_(4)Te_(1) material,it exhibits excellent dynamic tunability along with vivid color appearance including high brightness and high purity.In experiments,five representative colors—red,green,blue,yellow,and purple—were successfully prepared.The peak reflection of these samples averaged 92%,and when heated to 320°C,the temperature at which the phase transition of Ge_(2)Sb_(2)Se_(4)Te_(1) occurred,reflection loss was barely observed.In addition,after phase transition,the sideband reflection at non-target wavelengths decreased by 30%,bringing high-purity crystalline-state colors and noticeable color changes.Therefore,it is believed that the structural color scheme proposed here will contribute to the development of many fields including smart glasses,artificial retinal devices,high-resolution displays,and beyond.
基金Financial support from the NSFC(21401077 and 21371078)the start-up fund of Jiaxing University is gratefully acknowledged.
文摘A series of chalcogenide compounds with various compositions,i.e.,octanuclear or tetranuclear Zn-S clusters,have been synthesised in a straighforward manner.Different fused-ring aromatic ligands were used as capping ligands and the corresponding zero-dimensional(0D)products were obtained.On the other hand,use of bridging ligands led to a family of one-dimensional(1D)coordination polymers,and an in situ ligand reaction has been observed in[Zn_(8)S(SC_(6)H_(5))_(13)L_(1)(H_(2)O)]·2H_(2)O(L=3-carboxypryidyl)due to the hydrolysis of the cyano group of 3-pyridinecarbonitrile.A very rare 1D helical-chain structure was observed in[Zn_(4)(SC_(6)H_(5))_(8)L_(1)](L=4,4’-bipyridyl),providing evidence of the character of bridging organic ligands in the corresponding crystalline materials.First-principles calculations on[Zn_(4)(SC_(6)H_(5))_(8)L_(1)](L=4,4’-bipyridyl)further revealed that the two cluster units could rotate freely about the C-C single bond over a broad range,eventually leading to the formation of a one-dimensional helical structure.
