Structures and spin states of mono- and dinuclear iron(II) complexes of imidazole-4-carbaldehyde azine and its derivatives

Sunatsuki, Yukinari; Kawamoto, R.; Fujita, K.; Maruyama, Hisashi; Suzuki, Takayoshi; Ishida, Hiroyuki; Kojima, Masayasu; Iijima, Seiichiro; Matsumoto, Naohide

doi:10.1016/j.ccr.2009.11.016

Cited by 54 publications

(18 citation statements)

References 61 publications

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“…1 H NMR and 13 C NMR spectra were recorded on a Bruker 300 MHz spectrometer. High resolution ESI-MS data were acquired using a Waters Xevo QToF mass spectrometer, operating in positive ion mode.…”

Section: Physical Measurementsmentioning

confidence: 99%

“…In the present study, building on design principles demonstrated to be successful by Kruger, 11 Nitschke 10 and Gu; 8 imidazole-imine sites were included in the organic ligand component since these groups show weaker ligand strength than the 2,2 0 -bipyridyl and pyridyl-imine sites commonly employed in tetrahedral cage syntheses. In addition, imidazole-imine groups have been well documented to be 'classical' coordination units for inducing SCO behaviour in Fe(II) complex systems, [13][14][15][16][17][18] including the limited number of Fe(II) SCO tetrahedral cages already reported. 8,10,11 Here we report the synthesis of a new face-capped tetranuclear cage 1 of type [Fe 4 L 4 ](BF 4 ) 8 , employing a large fully conjugated rigid tribranched framework ligand (L in Fig.…”

Section: Introductionmentioning

confidence: 99%

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A large spin-crossover [Fe₄L₄]⁸⁺ tetrahedral cage

Saigo

Zhang

et al. 2015

J. Mater. Chem. C

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A large discrete face-capped tetranuclear iron(II) cage, [Fe 4 L 4 ](BF 4 ) 8 Án(solvent), was synthesised via metal-ion directed self-assembly. The cage is formed from a rigid tritopic ligand that incorporates chelating imidazole-imine functional groups. The cage displays temperature induced spin-crossover and LIESST effects and is amongst the largest iron(II) tetrahedral cages with such properties reported. The synthesis, structure and magnetic properties of this new metallo-cage are presented.

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Section: Physical Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A large spin-crossover [Fe₄L₄]⁸⁺ tetrahedral cage

Saigo

Zhang

et al. 2015

J. Mater. Chem. C

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“…Of the many iron(II) systems investigated those incorporating imidazole Schiff-base ligands have amongst the most varied SCO behaviours as exemplified in recent reviews by Kruger and Matsumoto [13,14]. In terms of mononuclear systems there are two basic designs one of which uses hexadentate ligands [15,16] and the other exploiting chelating imine ligands derived from an imidazolecarboxaldehyde.…”

Section: Introductionmentioning

confidence: 99%

Solvent Effects on the Spin Crossover Properties of Iron(II) Imidazolylimine Complexes

et al. 2019

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A series of Fe(II) complexes, fac-[Fe(4-ima-Bp)3](Y)2⋅sol (Y = ClO4; sol = 3EtOH 1, 3MeOH 2; Y= BF4; sol = EtOH⋅4H2O 3, 4H2O 4 and 3.5MeCN 5) have been prepared and structurally and magnetically characterized. The low temperature structures of 1, 2 and 5 have been determined by X-ray crystallography with LS Fe(II) centres found in all cases. Extensive C–H···π interactions between the cations form 2D layers, which are linked to one another through N-H···O and O-H···O hydrogen bonds, resulting in high cooperativity. Despite 5 containing MeCN, N-H···O/F hydrogen bonds, and C–H···π and π-π interactions combine to give similar 2D layers. Magnetic measurements reveal moderately abrupt spin crossover for 1-4; becoming more gradual and only 50% complete in 1 due to solvent loss. The MeCN solvate shows more gradual SCO and reinforces how subtle changes in packing can significantly influence SCO behaviour.

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“…The term "flexidentate" is used to describe the coordination behavior of this type of ligand. [7][8][9][10][11][12] Complexes of the transition metal with Schiff base ligands derived from amine-alcohols are Scheme 1. Synthesis of the flexidentate ligand probably the best know examples of this.…”

Section: Introductionmentioning

confidence: 99%

Anion Modulated Structural Variations in Copper(II) Complexes with a Flexidentate Ligand Derived from 2-((2-aminoethyl)amino)ethan-1-ol: Synthesis and Spectroscopic and X-ray Structural Characterization

Vafazadeh¹,

Kazemi-nasab²,

Willis³

2019

ACSi

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Flexidentate ligand, HL has been prepared by the condensation of aminoethylethanolamine (AEEA) with benzoylacetone (bezac). On reaction with copper(II) salts it gives complexes CuLClO 4 .H 2 O (1), CuLN 3 (2) and [Cu 3 L 3 Br]Br 2. H 2 O (3). All complexes have been characterized by X-ray crystallography. The results show that the hydroxyl group of the flexidentate ligand can coordinate to the Cu(II) center or remain as an uncoordinated group. In (1), the coordination number around the copper(II) ion is five coordinated and the ligand is tetradentate with the OH group coordinated to the copper(II) ion. Complex (2) has a square planar geometry and the L − ligand is tridentate with the hydroxyl group left uncoordinated. The X-ray diffraction analysis of the trinuclear complex (3) shows that the copper(II) centers are five-coordinate and L − is a tetradentate ligand with the hydroxyl group being both terminal and bridging. The Hirshfeld surface analysis and the 2D fingerprint plot were used to analyze all of the intermolecular contacts in the crystal structures.

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Structures and spin states of mono- and dinuclear iron(II) complexes of imidazole-4-carbaldehyde azine and its derivatives

Cited by 54 publications

References 61 publications

A large spin-crossover [Fe₄L₄]⁸⁺ tetrahedral cage

A large spin-crossover [Fe₄L₄]⁸⁺ tetrahedral cage

Solvent Effects on the Spin Crossover Properties of Iron(II) Imidazolylimine Complexes

Anion Modulated Structural Variations in Copper(II) Complexes with a Flexidentate Ligand Derived from 2-((2-aminoethyl)amino)ethan-1-ol: Synthesis and Spectroscopic and X-ray Structural Characterization

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Structures and spin states of mono- and dinuclear iron(II) complexes of imidazole-4-carbaldehyde azine and its derivatives

Cited by 54 publications

References 61 publications

A large spin-crossover [Fe4L4]8+ tetrahedral cage

A large spin-crossover [Fe4L4]8+ tetrahedral cage

Solvent Effects on the Spin Crossover Properties of Iron(II) Imidazolylimine Complexes

Anion Modulated Structural Variations in Copper(II) Complexes with a Flexidentate Ligand Derived from 2-((2-aminoethyl)amino)ethan-1-ol: Synthesis and Spectroscopic and X-ray Structural Characterization

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A large spin-crossover [Fe₄L₄]⁸⁺ tetrahedral cage

A large spin-crossover [Fe₄L₄]⁸⁺ tetrahedral cage