CM chondrites contain valuable insights into the formation and evolution of the solar nebula,as well as the secondary aqueous alteration processes that affected their parent bodies.Our study focuses on primary and sec...CM chondrites contain valuable insights into the formation and evolution of the solar nebula,as well as the secondary aqueous alteration processes that affected their parent bodies.Our study focuses on primary and secondary sulfides within the Aguas Zarcas(CM2)chondrite,investigating their formation mechanisms based on their morphology,textures,and compositions.Moreover,we infer the formation temperatures of the sulfides from 230 to 500℃ for primary and from 100 to 135℃ for secondary.We select representative grains and conduct Fe isotope measurements on them.The primary sulfides with δ^(56/54)Fe ranging from -2.44‰ to +0.69‰are associated with sulfidesilicate melt segregation,while secondary sulfides with δ^(56/54)Fe values between -1.83‰ and -0.14‰ are linked to aqueous alteration.Overall,the Ni content of the grains is positively correlated with δ^(56/54)Fe.It might be related to the changes in crystal structure and chemical bond lengths due to the increase in nickel content.Fe isotopes provide a new perspective on sulfide formation and the evolution of a carbonaceous chondrite parent body.展开更多
Luminescent Fe(Ⅲ) complexes have received increasing attention in recent years.However,upconversion luminescence from Fe(Ⅲ) complexes has not been explored yet,due to the low photoluminescence quantum yields(PLQYs)o...Luminescent Fe(Ⅲ) complexes have received increasing attention in recent years.However,upconversion luminescence from Fe(Ⅲ) complexes has not been explored yet,due to the low photoluminescence quantum yields(PLQYs)of Fe(Ⅲ) complexes,as well as a significant challenge in combining a proper sensitizer and Fe(Ⅲ) activator.In this work,a novel ion-paired Fe(Ⅲ)-Yb(Ⅲ) complex[Fe(phtmeimb)_(2)][Yb(ND)_(4)]was designed and synthesized,where the cation[Fe(phtmeimb)_(2)]^(+)(phtmeimb=phenyl[tris(3-methylimidazol-1-ylidene)]borate)arming the highest PLQY among Fe(Ⅲ) complexes so far was employed as activator,and the anion[Yb(ND)_(4)]^(-)(ND=3-cyano-2-methyl-1,5-naphthyridin-4-olate)featuring a large absorption cross-section at 980 nm was constructed as sensitizer.Upon the excitation of 980 nm,red doublet ligand-to-metal charge transfer(^(2)LMCT)emission of[Fe(phtmeimb)_(2)]^(+)was realized both in solution and doped film through a cooperative sensitization upconversion process.This is the first time to achieve Fe(Ⅲ) complex-based emission using the near-infrared light excitation,demonstrating the great potential of luminescent Fe(Ⅲ) complexes as activators in the upconversion luminescence field and promoting the development of fundamental research on the iron-based optical functional materials.展开更多
基金supported by the National Science Foundation of China(Nos.42225202 and 41827802)。
文摘CM chondrites contain valuable insights into the formation and evolution of the solar nebula,as well as the secondary aqueous alteration processes that affected their parent bodies.Our study focuses on primary and secondary sulfides within the Aguas Zarcas(CM2)chondrite,investigating their formation mechanisms based on their morphology,textures,and compositions.Moreover,we infer the formation temperatures of the sulfides from 230 to 500℃ for primary and from 100 to 135℃ for secondary.We select representative grains and conduct Fe isotope measurements on them.The primary sulfides with δ^(56/54)Fe ranging from -2.44‰ to +0.69‰are associated with sulfidesilicate melt segregation,while secondary sulfides with δ^(56/54)Fe values between -1.83‰ and -0.14‰ are linked to aqueous alteration.Overall,the Ni content of the grains is positively correlated with δ^(56/54)Fe.It might be related to the changes in crystal structure and chemical bond lengths due to the increase in nickel content.Fe isotopes provide a new perspective on sulfide formation and the evolution of a carbonaceous chondrite parent body.
基金supported by the National Key R&D Program of China(2021YFB3501800,2022YFB3503702,2023YFB3506901)the National Natural Science Foundation of China(U23A20593,22071003,92156016,21621061)。
文摘Luminescent Fe(Ⅲ) complexes have received increasing attention in recent years.However,upconversion luminescence from Fe(Ⅲ) complexes has not been explored yet,due to the low photoluminescence quantum yields(PLQYs)of Fe(Ⅲ) complexes,as well as a significant challenge in combining a proper sensitizer and Fe(Ⅲ) activator.In this work,a novel ion-paired Fe(Ⅲ)-Yb(Ⅲ) complex[Fe(phtmeimb)_(2)][Yb(ND)_(4)]was designed and synthesized,where the cation[Fe(phtmeimb)_(2)]^(+)(phtmeimb=phenyl[tris(3-methylimidazol-1-ylidene)]borate)arming the highest PLQY among Fe(Ⅲ) complexes so far was employed as activator,and the anion[Yb(ND)_(4)]^(-)(ND=3-cyano-2-methyl-1,5-naphthyridin-4-olate)featuring a large absorption cross-section at 980 nm was constructed as sensitizer.Upon the excitation of 980 nm,red doublet ligand-to-metal charge transfer(^(2)LMCT)emission of[Fe(phtmeimb)_(2)]^(+)was realized both in solution and doped film through a cooperative sensitization upconversion process.This is the first time to achieve Fe(Ⅲ) complex-based emission using the near-infrared light excitation,demonstrating the great potential of luminescent Fe(Ⅲ) complexes as activators in the upconversion luminescence field and promoting the development of fundamental research on the iron-based optical functional materials.
