Spin-crossover in dimeric hydrogen-bonded iron(II) 2-(pyrazolyl)-pyridine and 2-(imidazolyl)-pyridine complexes

Leita BA; Moubaraki B; Murray KS; Smith JP

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Spin-crossover in dimeric hydrogen-bonded iron(II) 2-(pyrazolyl)-pyridine and 2-(imidazolyl)-pyridine complexes

机译：二聚体氢键合的铁（II）2-（吡唑基）-吡啶和2-（咪唑基）-吡啶配合物的自旋交换

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Five new hydrogen-bonded solvated iron(H) complexes of pyrazolyl- and imidazolyl-based N,N-chelating ligands have been synthesised. Water to ligand-NH hydrogen-bonded bridges occur in the pseudo-dimeric complexes {cis-[Fe(pypzH)(2)(NCX)(2)](2)(-)(mu-OH2)(H2O)(2)) (.) (H2OMeOH)-Me-. (where X = S or Se), and in the chain complex {cis-[Fe(pypzH)(2)(NCS)(2)](mu-OH2)}(n). A "half" spin-crossover (T. = 125 K) was observed in the dimeric X = Se complex by means of magnetic measurements and no thermal hysteresis occurred between 4 and 300 K. The crystal structure at 123 K showed Fe-N distances consistent with the magnetism. Each Fe in the dimeric unit was structurally equivalent in the HS-LS state. Removal of the solvate molecules led to HS-HS behaviour over the temperature range 4-300 K. The pseudo-dimer with X = S also showed HS-HS behaviour as did the monomeric analogue cis[Fe(pypzH)(2)(NCS)(2)]H2O and a structurally different methanol-bridged dimer [cis-[Fe(pyimH)(2)(NCS)(2)](2)(mu-McOH)(2)} (.) 2MeOH (pypzH = 2-(1H-pyrazol-3-yl)-pyridine; pyimH = 2-(1H-imidazol-2-yl)-pyridine). (c) 2005 Elsevier Ltd. All rights reserved.

机译：已合成了五种基于吡唑基和咪唑基的N，N螯合配体的新的氢键合溶剂化铁（H）配合物。水到配体-NH的氢键桥存在于假二聚体络合物中[cis- [Fe（pypzH）（2）（NCX）（2）]（2）（-）（mu-OH2）（H2O）（2 ））（。）（H2OMeOH）-Me-。（其中X = S或Se），以及在链络合物{顺式[Fe（pypzH）（2）（NCS）（2）]（mu-OH2）}（n）中。通过磁性测量，在二聚体X = Se络合物中观察到“半”自旋交叉（T. = 125 K），并且在4和300 K之间没有发生热滞。在123 K处的晶体结构显示Fe-N距离与磁力一致。二聚体单元中的每个Fe在HS-LS状态下在结构上均等价。去除溶剂化物分子导致在4-300 K的温度范围内发生HS-HS行为。X = S的假二聚体也显示出HS-HS行为，单体类似物顺式[Fe（pypzH）（2）（NCS）也是如此）（2）] H2O和结构上不同的甲醇桥联二聚体[cis- [Fe（pyimH）（2）（NCS）（2）]（2）（mu-McOH）（2）}（。）2MeOH（pypzH ＝ 2-（1H-吡唑-3-基）-吡啶; pyimH ＝ 2-（1H-咪唑-2-基）-吡啶）。（c）2005 Elsevier Ltd.保留所有权利。

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《Polyhedron: The International Journal for Inorganic and Organometallic Chemistry》 |2005年第17期|共8页
作者
Leita BA; Moubaraki B; Murray KS; Smith JP;
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正文语种 eng
中图分类化学;
关键词
iron(II); dimeric; hydrogen-bonded; spin-crossover; magnetic; structures; TRANSITION; MAGNETISM; MOSSBAUER;

机译：铁（II）;二聚体;氢键;自旋交联;磁性;结构;转变;磁性;MOSSBAUER;

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1. Spin-crossover in dimeric hydrogen-bonded iron(II) 2-(pyrazolyl)-pyridine and 2-(imidazolyl)-pyridine complexes [J] . Leita BA, Moubaraki B, Murray KS, Polyhedron: The International Journal for Inorganic and Organometallic Chemistry . 2005,第16a17期

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Spin-crossover in dimeric hydrogen-bonded iron(II) 2-(pyrazolyl)-pyridine and 2-(imidazolyl)-pyridine complexes

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