In:
ChemistrySelect, Wiley, Vol. 1, No. 13 ( 2016-08-16), p. 3879-3884
Abstract:
The introduce of halogen atoms (F, Cl, Br, I) to the triazole‐based ligand N‐benzyl‐4‐amino‐1, 2, 4‐triazole ( L ) have shown a significant effect on the spin‐crossover (SCO) properties of the corresponding one‐dimensional (1D) coordination Fe (II) polymers with chemical formula [Fe(4‐X– L ) 3 ](BF 4 ) 2 (X=F, Cl, Br, and I). Compared with the [Fe L 3 ](BF 4 ) 2 , the electronegative halogen atoms have increased the π‐acceptor character of these ligands, which thus improved the ligand field strength and induced the occurrence of SCO for the Fe (II) polymers at higher temperatures. The SCO transition temperatures T 1/2 have changed from 200 K to 249 (I), 250 (Br), 252 (Cl) and 275 (F) K, respectively. More importantly, the UV‐Vis absorption spectrum and density functional theory (DFT) calculations indicated that the transition temperatures and the width of thermal hysteresis loops have shown a positive correlation with the electronegativity of the halogen atoms.
Type of Medium:
Online Resource
ISSN:
2365-6549
,
2365-6549
DOI:
10.1002/slct.201600644
Language:
English
Publisher:
Wiley
Publication Date:
2016
detail.hit.zdb_id:
2844262-3
Permalink