Photomagnetism of Molecular Systems

Gütlich, P.; Garcia, Yann

doi:10.1016/b0-08-043152-6/01231-6

Cited by 43 publications

(58 citation statements)

References 18 publications

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“…The average metal-ligand distances of Fe2-N Tp and Fe3-N Tp are 1.985 Å and 1.988 Å, respectively, and are shorter than those found in the HS iron(III) complex [Fe(Tp)Cl 3 ]¯ (2.163 Å) [18] and are similar to those reported for the LS iron(III) compound. Because of this, the Fe2 and Fe3 can be considered to be Fe (III) (2) C52-Fe3-N20 178.7(2) C53-Fe3-N20 93.2 (2) C54-Fe3-N20 90.5(2) C52-Fe3-N16 92.6 (2) C53-Fe3-N16 92.1(2) C54-Fe3-N16 177.5 (2) N20-Fe3-N16 87.67(18) C52-Fe3-N18 89.9 (2) C53-Fe3-N18 178.0(2) C54-Fe3-N18 93.5(2) N20-Fe3-N18 88.87(18) N16-Fe3-N18 88.16 (18) …”

Section: Structure Determinations and Refinementsmentioning

confidence: 99%

“…In order to control SCO behavior, external stimuli such as thermal stimulus, irradiation, pressure, or guest molecules are normally used. [1][2][3][4][5][6][7][8][9] SCO compounds have attracted much attention, not only from the viewpoint of basic science, but also for their practical applications, because such bistable compounds may be used for future memory and switching devices. Because of this, a large number of SCO complexes have been developed since the first spin transition phenomenon was observed by Cambi and Szego in 1931.…”

Section: Introductionmentioning

confidence: 99%

“…Because of this, a large number of SCO complexes have been developed since the first spin transition phenomenon was observed by Cambi and Szego in 1931. [1][2][3][10][11][12][13][14] One of the interesting properties in SCO complexes is that the spin state can be controlled by replacing counter anions and by the subtle modification of ligands. It has been reported that the Fe(II) complex with 2,2′:6′,2′′-terpyridine (tpy) ligand and its derivatives is able to assume an HS or LS state depending on the structure of the coordinated ligands [15] .…”

Section: Introductionmentioning

confidence: 99%

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Crystal Structure and Magnetic Properties of a novel Fe(II) complex with 2,2′:6′2′′-Terpyridine Ligand

Zhang

Yao

et al. 2014

Trans. Mat. Res. Soc. Japan

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Section: Structure Determinations and Refinementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crystal Structure and Magnetic Properties of a novel Fe(II) complex with 2,2′:6′2′′-Terpyridine Ligand

Zhang

Yao

et al. 2014

Trans. Mat. Res. Soc. Japan

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“…[4][5][6][7] Following these findings the research was focused on the light induced changes of the optical and magnetic properties of coordination compounds of transition metal ions.…”

Section: Introductionmentioning

confidence: 99%

Optically induced valence tautomeric interconversion in cobalt dioxolene complexes

Beni¹,

Carbonera²,

Dei³

et al. 2006

J. Braz. Chem. Soc.

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A descoberta de que vários complexos de cobalto-dioxoleno exibem bi-estabilidade magnética foto induzida foi descrita recentemente. Este fenômeno encontra-se sempre associado a processos de interconversão de tautômeros de valência entre espécies de cobalto(III) baixo spin e de cobalto(II) alto spin. Enfatiza-se, nesta revisão, a forte correlação formal existente entre estes processos e o efeito LIESST (Light-Induced Excited Spin State Trapping) exibido por vários complexos de ferro(II) que sofrem interconversão de spin. A dinâmica da relaxação da espécie meta-estável fotoinduzida para o estado fundamental é discutida em termos de processos adiabáticos no âmbito da teoria de Jortner da relaxação multifônica sem radiação.The discovery that a number of cobalt-dioxolene complexes undergo photoswitchable behavior was reported in the recent past. This phenomenon is always associated with valence tautomeric interconversion processes involving low-spin cobalt(III) and high-spin cobalt(II) species. Herein is stressed the strong formal correlation existing between these processes and the LIESST (Light-Induced Excited Spin State Trapping) effect shown by several iron(II) complexes undergoing spin crossover interconversion. The dynamics of the relaxation of the photoinduced metastable species to the ground state is discussed in terms of non-adiabatic processes within the Jortner theory of radiationless multiphonon relaxation.

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“…2 Indeed, molecular magnets such as singlemolecule magnets (SMMs) and single chain magnets (SCMs), the properties of which are reliant upon the interactions mediated by cyanide bridges, can be controllably constructed following modular approaches to molecular design with cyanometallate units. 3,4 For example, combinations of building units with two or three free cyanide groups can often lead to the synthesis of square type [M 2 M′ 2 ] molecules. 5 Such discrete molecules have been shown to display dynamic spin transition phenomena such as multi-spin crossover behaviour and electron-transfer-coupled spin transitions (ETCST).…”

mentioning

confidence: 99%

A rectangular Ni–Fe cluster with unusual cyanide bridges

et al. 2012

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An asymmetric polycyanide iron complex, K 2 [Fe III (L1)-(CN) 4 ](MeOH) (HL1 = 2,2′-(1H-pyrazole-3,5-diyl)bis-pyridine), was synthesized and its complexation compatibility with nickel ions was examined. Two kinds of enantiomeric nickel-iron squares were obtained in the presence of a chiral bidentate capping ligand. The compounds display unusual cyanide bridge geometry and have ferromagnetic interactions between nickel and iron ions.The cyanide group is a valuable unit for the construction of molecular assemblies with magnetic and electronic interactions between metal ions because it can form linear bridges between neighbouring metal centres. Cyanometallates are well known in the literature, and can form coordination bonds to transition metal ions through their terminal N donor atoms. 1 Many examples of functional cyanide-bridged molecular assemblies have been reported. 2 Indeed, molecular magnets such as singlemolecule magnets (SMMs) and single chain magnets (SCMs), the properties of which are reliant upon the interactions mediated by cyanide bridges, can be controllably constructed following modular approaches to molecular design with cyanometallate units. 3,4 For example, combinations of building units with two or three free cyanide groups can often lead to the synthesis of square type [M 2 M′ 2 ] molecules. 5 Such discrete molecules have been shown to display dynamic spin transition phenomena such as multi-spin crossover behaviour and electron-transfer-coupled spin transitions (ETCST). 6 The development of new polycyano building blocks may be important for the generation of novel functional molecular systems. Therefore, we have focussed on the syntheses of polycyano iron complexes with a polynucleating ligand. In this work, the bis-bidentate ligand, 3,5-bis(2-pyridyl)-pyrazolate (HL1), was chosen as the capping ligand and a novel tetracyanoferrate complex was developed. Using the tetracyano iron complex as a building block, two cyanide-bridged tetranuclear nickel-iron complexes were synthesized and their magnetic properties were investigated.The tetracyanoferrate complex, K 2 [Fe III (L1)(CN) 4 ](MeOH) (1·MeOH), was synthesized by the reaction of Fe-(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O in boiling water with HL1 and KCN. ‡ Single crystal X-ray analysis of 1·MeOH reveals that the pyrazolate group of the ligand is deprotonated and coordinates to one iron and one potassium ion which occupy the two bidentate sites of L1 (Fig. 1). The second potassium ion connects neighbouring complexes through the CN groups. 1 forms a one-dimensional network structure linked by potassium ions. § The combination of the tetracyanoferrate complex 1 with NiCl 2 ·6H 2 O and the

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Photomagnetism of Molecular Systems

Cited by 43 publications

References 18 publications

Crystal Structure and Magnetic Properties of a novel Fe(II) complex with 2,2′:6′2′′-Terpyridine Ligand

Crystal Structure and Magnetic Properties of a novel Fe(II) complex with 2,2′:6′2′′-Terpyridine Ligand

Optically induced valence tautomeric interconversion in cobalt dioxolene complexes

A rectangular Ni–Fe cluster with unusual cyanide bridges

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