Two binuclear silver complexes, [Ag2{μ-S2P（OCH2Ph）2}2（phen）2] （1） and [Ag2{μ- SEP（OCH2CH2Ph）2}E（phen）2] （2）, were synthesized and characterized by elemental analysis, infrared spectrum, thermo-gravimetri...Two binuclear silver complexes, [Ag2{μ-S2P（OCH2Ph）2}2（phen）2] （1） and [Ag2{μ- SEP（OCH2CH2Ph）2}E（phen）2] （2）, were synthesized and characterized by elemental analysis, infrared spectrum, thermo-gravimetric analysis and X-ray single-crystal diffraction. Complex 1 crystallizes in the triclinic system, space group P1 with a = 9.7881（4）, b = 10.7726（4）, c = 13.1952（6） A, a = 103.686（4）, ,8= 99.477（3）, ）, = 107.494（4）°, F= 1246.88（9）A3, Dc = 1.591 g.m-3 and Z = 1; Complex 2 is of monoclinic system, space group P2jn with a = 10.6014（8）, b = 24.3969（15）, c = 11.5353（10）A,β= 14.125（10）°, F= 2722.9（4） A3, Dc = 1.526 g.m-3 and Z = 2. In the molecules of 1 and 2, O,O＇-dialkyldithiophosphate anions, （PhCHEO）PS2 and （PhCH2CHEO）PS2 act as bridging ligands and connect two Ag（I） centers into a binuclear unit with AgES4P2 eight-membered rings in ＂chair＂ conformations. In both crystal structures, face-to-face π-π stacking interactions between the adjacent paralleling aromatic rings of 1,10-phenanthroline play a prominent role in the crystal packing and result in a 1D chain. And such 1D chains are further linked into 3D networks by weak intermolecular C-H...π interactions for 1.展开更多
Structural reconstruction of electrocatalysts plays a pivotal role in catalytic performances for CO_(2)reduction reaction(CO_(2)RR),whereas the behavior is by far superficially understood.Here,we report that CO_(2)acc...Structural reconstruction of electrocatalysts plays a pivotal role in catalytic performances for CO_(2)reduction reaction(CO_(2)RR),whereas the behavior is by far superficially understood.Here,we report that CO_(2)accessibility results in a universal self-adaptive structural reconstruction from Cu_(2)O to Cu@CuxO composites,ending with feeding gas-dependent microstructures and catalytic performances.The CO_(2)-rich atmosphere favors reconstruction for CO_(2)RR,whereas the CO_(2)-deficient one prefers that for hydrogen evolution reaction.With the assistance of spectroscopic analysis and theoretical calculations,we uncover a CO_(2)-induced passivation behavior by identifying a reductionresistant but catalytic active Cu(I)-rich amorphous layer stabilized by*CO intermediates.Additionally,we find extra CO production is indispensable for the robust production of C2H4.An inverse correlation between durability and FECO/FEC2H4 is disclosed,suggesting that the selfstabilization process involving the absorption of*CO intermediates on Cu(I)sites is essential for durable electrolysis.Guided by this insight,we design hollow Cu_(2)O nanospheres for durable and selective CO_(2)RR electrolysis in producing C2H4.Our work recognizes the previously overlooked passivation reconstruction and self-stabilizing behavior and highlights the critical role of the local atmosphere in modulating reconstruction and catalytic processes.展开更多
基金supported by the project of Science&Technology Department of Sichuan Province(2011JY0052,2012JY0115)Sichuan University of Science&Engineering(2012PY04,2012PY14,2012KY12)University Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education(LZJ1203,LYJ1301,LYJ1306)
文摘Two binuclear silver complexes, [Ag2{μ-S2P（OCH2Ph）2}2（phen）2] （1） and [Ag2{μ- SEP（OCH2CH2Ph）2}E（phen）2] （2）, were synthesized and characterized by elemental analysis, infrared spectrum, thermo-gravimetric analysis and X-ray single-crystal diffraction. Complex 1 crystallizes in the triclinic system, space group P1 with a = 9.7881（4）, b = 10.7726（4）, c = 13.1952（6） A, a = 103.686（4）, ,8= 99.477（3）, ）, = 107.494（4）°, F= 1246.88（9）A3, Dc = 1.591 g.m-3 and Z = 1; Complex 2 is of monoclinic system, space group P2jn with a = 10.6014（8）, b = 24.3969（15）, c = 11.5353（10）A,β= 14.125（10）°, F= 2722.9（4） A3, Dc = 1.526 g.m-3 and Z = 2. In the molecules of 1 and 2, O,O＇-dialkyldithiophosphate anions, （PhCHEO）PS2 and （PhCH2CHEO）PS2 act as bridging ligands and connect two Ag（I） centers into a binuclear unit with AgES4P2 eight-membered rings in ＂chair＂ conformations. In both crystal structures, face-to-face π-π stacking interactions between the adjacent paralleling aromatic rings of 1,10-phenanthroline play a prominent role in the crystal packing and result in a 1D chain. And such 1D chains are further linked into 3D networks by weak intermolecular C-H...π interactions for 1.
基金supported by the National Natural Science Foundation of China(Grant No.22479097)the Shanghai Science and Technology Committee(Grant No.23ZR1433000)the National High-Level Talent Program for Young Scholars,the Start-up Fund(F.S.)from Shanghai Jiao Tong University.
文摘Structural reconstruction of electrocatalysts plays a pivotal role in catalytic performances for CO_(2)reduction reaction(CO_(2)RR),whereas the behavior is by far superficially understood.Here,we report that CO_(2)accessibility results in a universal self-adaptive structural reconstruction from Cu_(2)O to Cu@CuxO composites,ending with feeding gas-dependent microstructures and catalytic performances.The CO_(2)-rich atmosphere favors reconstruction for CO_(2)RR,whereas the CO_(2)-deficient one prefers that for hydrogen evolution reaction.With the assistance of spectroscopic analysis and theoretical calculations,we uncover a CO_(2)-induced passivation behavior by identifying a reductionresistant but catalytic active Cu(I)-rich amorphous layer stabilized by*CO intermediates.Additionally,we find extra CO production is indispensable for the robust production of C2H4.An inverse correlation between durability and FECO/FEC2H4 is disclosed,suggesting that the selfstabilization process involving the absorption of*CO intermediates on Cu(I)sites is essential for durable electrolysis.Guided by this insight,we design hollow Cu_(2)O nanospheres for durable and selective CO_(2)RR electrolysis in producing C2H4.Our work recognizes the previously overlooked passivation reconstruction and self-stabilizing behavior and highlights the critical role of the local atmosphere in modulating reconstruction and catalytic processes.
