Pyrazole's substituents effect on the spin state of [Fe(bpp)2]2+complexes

被引：3

作者：

Oulmidi, Afaf ^{[1
,2
]}

Rotaru, Aurelian ^{[3
,4
]}

Radi, Smaail ^{[1
]}

Garcia, Yann ^{[2
]}

机构：

[1] Univ Mohamed I, Fac Sci, Dept Chem, LCAE, 524 BP, Oujda 60000, Morocco

[2] Catholic Univ Louvain, Inst Condensed Matter & Nanosci Mol Chem Mat & Ca, Pl L Pasteur 1, B-1348 Louvain La Neuve, Belgium

[3] Stefan Cel Mare Univ, Dept Elect Engn & Comp Sci, Univ St 13, Suceava 720229, Romania

[4] Stefan Cel Mare Univ, Res Ctr MANSiD, Univ St 13, Suceava 720229, Romania

来源：

HYPERFINE INTERACTIONS | 2021年 / 242卷 / 01期

关键词：

Iron(II) complexes; bpp ligand; Fe-57 Mossbauer spectroscopy; spin crossover; TERPYRIDINE; COMPLEXES; CHEMISTRY; IRON(II);

D O I：

10.1007/s10751-021-01730-w

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

2,6-dipyrazolyl pyridine (bpp) skeleton is a good building unit for iron(II) spin crossover research. Various functional groups can be appended on pyrazolyl and pyridine rings thereby modifying potentially the spin state properties of [Fe(bpp)(2)](2+) derivatives. In this work, we have worked on substituted pyrazole by grafting an ester function as an electro-attractor group and a methyl substituent as an electro-donating group in 3 and 5 positions, respectively. Mossbauer analyses of the mononuclear complex 1 [FeL2](ClO4)(2) (L= diethyl-1,1'-(pyridine-2,6-diyl)bis(5-methyl-1H-pyrazole-3-carboxylate) revealed high-spin iron(II) ions at room temperature. On cooling down to liquid helium temperature, magnetic susceptibility measurements confirmed a paramagnetic state, suggesting that the steric influence of the pyrazole substituents was to great to allow a thermally induced spin crossover to occur.

引用

页数：6

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