Spin State of the Iron(II) and Cobalt(II) 2,6-Di(5-Amino-1H-Pyrazol-3-yl)pyridine Complexes in Solution and in Crystal

被引：5

作者：

Pavlov, A. A. ^{[1
]}

Nikovskii, I. A. ^{[1
]}

Polezhaev, A. V. ^{[1
,2
]}

Aleshin, D. Yu. ^{[1
,3
]}

Melnikova, E. K. ^{[1
,4
]}

Pankratova, Ya. A. ^{[4
]}

Nelyubina, Yu. V. ^{[1
,5
]}

机构：

[1] Russian Acad Sci, Nesmeyanov Inst Organoelement Cpds, Moscow 119991, Russia

[2] Bauman State Tech Univ, Moscow 107005, Russia

[3] Mendeleev Univ Chem Technol, Moscow 125190, Russia

[4] Moscow MV Lomonosov State Univ, Moscow 119899, Russia

[5] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Moscow 119991, Russia

来源：

RUSSIAN JOURNAL OF COORDINATION CHEMISTRY | 2019年 / 45卷 / 06期

基金：

俄罗斯科学基金会; 俄罗斯基础研究基金会;

关键词：

transition metal complexes; spin state; spin transition; NMR spectroscopy; CROSSOVER; LIGANDS; DESIGN;

D O I：

10.1134/S1070328419060046

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The cobalt(II) and iron(II) complexes with 2,6-di(5-amino-1H-pyrazol-3-yl)pyridine (L), CoL2(ClO4)(2) (I) and FeL2(ClO4)(2) (II), are synthesized by the template reaction, isolated in the individual form, and characterized by elemental analysis, NMR spectroscopy, and thermogravimetry. The structures of complexes I and II (including the iron(II) complex obtained as two new solvate forms (FeL2(ClO4)(2) . 2(C2H5)(2)O . H3CN (IIa) and FeL2(ClO4)(2) . (C2H5)(2)O . CH3CN . 0.75H(2)O (IIb)) are confirmed by X-ray diffraction analysis. The data obtained in the crystal (by the X-ray diffraction method) and in solutions (using the proposed approach to an analysis of paramagnetic shifts in H-1 NMR spectra) indicate that the metal ion in the complexes exists in the high-spin state (S = 3/2 for Co(II) and S = 2 for Fe(II)) and undergoes no temperature-induced spin transition in a range of 120-300 K.

引用

页码：402 / 410

页数：9

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