As a kind of metastable aggregation between iron ions and iron hydroxide precipitates,Fe clusters can only be isolated under narrow synthesis conditions.Here,two Fe clusters with different structural models,[Fe_(6)(H_...As a kind of metastable aggregation between iron ions and iron hydroxide precipitates,Fe clusters can only be isolated under narrow synthesis conditions.Here,two Fe clusters with different structural models,[Fe_(6)(H_(2)thmmg)_(6)](Fe_(6))and[Fe_(18)O_(8)(OH)_(8)(H_(2)thmmg)_(10)](Fe_(18)),are constructed based on a rare N-tris(hydroxymethyl)methylglycine(H5thmmg)ligand.The cyclic Fe_(6) can be visualized as a“six-vane windmill”comprised of 6 Fe^(3+)and 6 H_(2)thmmg^(3-)ligands.Unlike the cyclic configuration of Fe_(6),the Fe_(18) cluster features a bricky structure like a“Chinese knot”coordinated by three species,H_(2)thmmg^(3-),OH-and O^(2-).It was obtained by adding more triethylamine to the reactive solution of Fe_(6) which yielded more coordinated species OH-and O^(2-).Moreover,the conversion from Fe_(6) to Fe_(18) was successfully achieved by adding more triethylamine,realizing nuclearity enlargement and structural regulation of Fe clusters.Furthermore,the magnetic properties of Fe_(6) and Fe_(18) exhibit antiferromagnetism.This work reports two novel alkali-regulated Fe clusters and further realizes the transformation of nuclearity and structure,which provides some reference for the structural predesign and adjustment of metal nanoclusters.展开更多
基金supported by the National Natural Science Foundation of China(No.22071126).
文摘As a kind of metastable aggregation between iron ions and iron hydroxide precipitates,Fe clusters can only be isolated under narrow synthesis conditions.Here,two Fe clusters with different structural models,[Fe_(6)(H_(2)thmmg)_(6)](Fe_(6))and[Fe_(18)O_(8)(OH)_(8)(H_(2)thmmg)_(10)](Fe_(18)),are constructed based on a rare N-tris(hydroxymethyl)methylglycine(H5thmmg)ligand.The cyclic Fe_(6) can be visualized as a“six-vane windmill”comprised of 6 Fe^(3+)and 6 H_(2)thmmg^(3-)ligands.Unlike the cyclic configuration of Fe_(6),the Fe_(18) cluster features a bricky structure like a“Chinese knot”coordinated by three species,H_(2)thmmg^(3-),OH-and O^(2-).It was obtained by adding more triethylamine to the reactive solution of Fe_(6) which yielded more coordinated species OH-and O^(2-).Moreover,the conversion from Fe_(6) to Fe_(18) was successfully achieved by adding more triethylamine,realizing nuclearity enlargement and structural regulation of Fe clusters.Furthermore,the magnetic properties of Fe_(6) and Fe_(18) exhibit antiferromagnetism.This work reports two novel alkali-regulated Fe clusters and further realizes the transformation of nuclearity and structure,which provides some reference for the structural predesign and adjustment of metal nanoclusters.
