Homochiral complexes[Fe(RR-L)(NCSe)_(2)](RR-1;RR-L=(1R,2R)-N^(1),N^(2)-bis(pyridin-2-ylmethyl)cyclohexane-1,2-diamine),[Fe(SS-L)(NCSe)_(2)](SS-1;SS-L=(1S,2S)-N^(1),N^(2)-bis(pyridin-2-ylmethyl)cyclohexane-1,2-diamine)...Homochiral complexes[Fe(RR-L)(NCSe)_(2)](RR-1;RR-L=(1R,2R)-N^(1),N^(2)-bis(pyridin-2-ylmethyl)cyclohexane-1,2-diamine),[Fe(SS-L)(NCSe)_(2)](SS-1;SS-L=(1S,2S)-N^(1),N^(2)-bis(pyridin-2-ylmethyl)cyclohexane-1,2-diamine),[Fe(RR-L)(NCSe)_(2)]_(2)(RR-2)and[Fe(SS-L)(NCSe)_(2)]_(2)(SS-2)and their racemic analogue complex rac-[FeL(NCSe)_(2)](rac-1;rac-L is a mixture of an equal ratio of RR-L and SS-L)were synthesized,characterized by single-crystal X-ray crystallography and circular dichroism(CD)spectroscopy,and investigated for their spin-crossover(SCO)behaviours.The enantiomers RR-1 and SS-1 show thermally induced non-hysteretic SCO behaviours centered at 146 K and their polymorphs RR-2 and SS-2 undergo more gradual SCO with a transition temperature of 162 K,while the racemic polymorph rac-1 is unexpectedly high spin only.展开更多
基金supported by the National Natural Science Foundation of China(Grants 21971016,21671161,21701013,and 21701014).
文摘Homochiral complexes[Fe(RR-L)(NCSe)_(2)](RR-1;RR-L=(1R,2R)-N^(1),N^(2)-bis(pyridin-2-ylmethyl)cyclohexane-1,2-diamine),[Fe(SS-L)(NCSe)_(2)](SS-1;SS-L=(1S,2S)-N^(1),N^(2)-bis(pyridin-2-ylmethyl)cyclohexane-1,2-diamine),[Fe(RR-L)(NCSe)_(2)]_(2)(RR-2)and[Fe(SS-L)(NCSe)_(2)]_(2)(SS-2)and their racemic analogue complex rac-[FeL(NCSe)_(2)](rac-1;rac-L is a mixture of an equal ratio of RR-L and SS-L)were synthesized,characterized by single-crystal X-ray crystallography and circular dichroism(CD)spectroscopy,and investigated for their spin-crossover(SCO)behaviours.The enantiomers RR-1 and SS-1 show thermally induced non-hysteretic SCO behaviours centered at 146 K and their polymorphs RR-2 and SS-2 undergo more gradual SCO with a transition temperature of 162 K,while the racemic polymorph rac-1 is unexpectedly high spin only.
