Chlorido‐Bridged Mn<sup>II</sup> Schiff‐Base Complex with Ferromagnetic Exchange Interactions

Qi, Chunjian; Sun, Xu-Xia; Gao, Song; Ma, Shulan; Yuan, Daqiang; Fan, Cuihong; Huang, Hung-Chun; Zhu, Wenchao

doi:10.1002/ejic.200700164

Cited by 12 publications

(3 citation statements)

References 53 publications

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“…26,30 Based on literature precedence, the weaker bands at λ max = 426 and 492 nm are tentatively assigned to the Fe-O-Fe and phenolate-Fe LMCT bands. 26,30,31 Although several attempts were made to grow sufficient quantities of single crystals of (5) for magnetic susceptibility studies, we were only able to isolate a few single crystals among a crystalline powder. CHN analysis of the powder was not an acceptable fit for the molecular formula of (5).…”

Section: Coordination Chemistry Of L8mentioning

confidence: 97%

Structural insights into the coordination chemistry and reactivity of a 3,3′-bis-imine-2,2′-bipyridine ligand

et al. 2016

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The coordination chemistry of the bis-salicyl-appended Schiff-base ligand L8 with Lewis acidic metal ions affords the mononuclear complex [SnĲL9)Cl 4 ] (1) and two paramagnetic dimers [CuĲL9)Ĳsal)] 2 ĲClO 4 ) 2 , (2) and [MnĲL9)Cl 2 ĲEtOH)] 2 ] (3). The X-ray crystal structures of 1-3 reveal a propensity for L8 to undergo metal catalyzed hydrolysis and cyclization to the diazepine ligand L9. Theoretical calculations on L8 and a model SnĲIV) complex reveal that coordination to a metal ion weakens the imine bonds, rendering them more susceptible to hydrolysis reactions and/or attack by nucleophiles. In contrast, reaction of L8 with FeCl 3 in the presence of base affords the partial hydrolysis product [FeĲL10) 2 ]Cl•CH 3 CN (4). Tuning the reaction conditions via the addition of a second base slows down the hydrolysis of the ligand sufficiently to afford a few crystals of the μ 2 -oxo diferric complex (μ-O)ĳFeĲL8)] 2 •2CH 3 CN (5) in which intact L8 coordinates to the FeĲIII) in a bis-bidentate manner through a deprotonated salicyl oxygen and a bis-imine nitrogen lone pair, with the nitrogen atoms of its 2,2′-bipyridine remaining uncoordinated.

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Section: Coordination Chemistry Of L8mentioning

confidence: 97%

Structural insights into the coordination chemistry and reactivity of a 3,3′-bis-imine-2,2′-bipyridine ligand

et al. 2016

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“…However, these systems are based on coordination compounds with rather sophisticated structures and it would be valuable to find simpler structural complexes bearing abiotic allosterism or catalytic regulation. In this aspect, dimeric or polymeric structures can be easily achieved with chlorido bridges [29][30][31][32][33], which can suffer ligand substitution reactions to form monomeric species in solution, enabling an easy approach to obtain different reactivities of the complex in an allosteric manner.…”

Section: Introductionmentioning

confidence: 99%

Solvent Effect on the Regulation of Urea Hydrolysis Reactions by Copper Complexes

et al. 2020

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Abiotic allosterism is most commonly observed in hetero-bimetallic supramolecular complexes and less frequently in homo-bimetallic complexes. The use of hemilabile ligands with high synthetic complexity enables the catalytic center by the addition or removal of allosteric effectors and simplicity is unusually seen in these systems. Here we describe a simpler approach to achieve kinetic regulation by the use of dimeric Schiff base copper complexes connected by a chlorido ligand bridge. The chlorido ligand acts as a weak link between monomers, generating homo-bimetallic self-aggregating supramolecular complexes that generate monomeric species in different reaction rates depending on the solvent and on the radical moiety of the ligand. The ligand exchange was observed by electron paramagnetic resonance (EPR) and conductivity measurements, indicating that complexes with ligands bearing methoxyl (CuIIL2) and ethoxyl (CuIIL5) radicals were more prone to form dimeric complexes in comparison to ligands bearing hydrogen (CuIIL1), methyl (CuIIL3), or t-butyl (CuIIL4) radicals. The equilibrium between dimer and monomer afforded different reactivities of the complexes in acetonitrile/water and methanol/water mixtures toward urea hydrolysis as a model reaction. It was evident that the dimeric species were inactive and that by increasing the water concentration in the reaction medium, the dimeric structures dissociated to form the active monomeric structures. This behavior was more pronounced when methanol/water mixtures were employed due to a slower displacement of the chlorido bridge in this medium than in the acetonitrile/water mixtures, enabling the reaction kinetics to be evaluated. This effect was attributed to the preferential solvation shell by the organic solvents and in essence, an upregulation behavior was observed due to the intrinsic nature of the complexes to form dimeric structures in solution that could be dismantled in the presence of water, indicating their possible use as water-sensors in organic solvents.

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“…It is well known that the ligands with two or much more functional groups, such as -NO 2 , -COOH, -C=N, and so on, can be used to construct unusual metalorganic frameworks. [12][13][14][15] Furthermore, it has been thought that many novel properties and potential applications would emerge from unusual molecular structures. Therefore, much effort should be done to synthesize unusual complexes with useful physical-chemical properties and intriguing structural topologies.…”

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confidence: 99%

A New Terbium Coordination Polymer Constructed from 4-Oxo-1(4H)quinolineacetate: Synthesis, Crystal Structure, and Fluorescent Properties

Wang

Hou

Zhuang

2011

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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A new terbium complex, Tb(L) 2 ·2H 2 O [L = 4-oxo-1(4H)quinolineacetate] (1), has been synthesized and structurally characterized by elemental analysis, thermal analysis, and infraredspectroscopy,as well as single-crystal x-ray diffraction. Single-crystal x-ray analysis reveals that 1 is a three-dimensional supramolecular network built up from two-dimensional (2D) layers with the (4,4) net that is assembled via hydrogen bonding and π ···π stacking interactions. Furthermore, the solid-state photofluorescent property of complex 1 has also been investigated.Keywords crystal structure, fluorescence, H-bonding and π -π stacking interactions, 4-oxo-1(4H)quinolineacetate INTRODUCTIONLanthanide complexes with polycarboxylates have attracted much attention in past decades, due to the intriguing structural diversity of architectures [1−4] and potential applications in a wide range of functional materials, such as gas adsorption and separation, light conversion devices and luminescence probes, [5−11] etc. Up to now, numerous one-, two-, and threedimensional coordination polymers have been synthesized by the choice of appropriate metal ions and versatile bridging organic ligands. It is well known that the ligands with two or much more functional groups, such as -NO 2 , -COOH, -C=N, and so on, can be used to construct unusual metalorganic frameworks. [12][13][14][15] Furthermore, it has been thought that many novel properties and potential applications would emerge from unusual molecular structures. Therefore, much effort should be done to synthesize unusual complexes with useful physical-chemical properties and intriguing structural topologies. [16]

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Chlorido‐Bridged Mn^II Schiff‐Base Complex with Ferromagnetic Exchange Interactions

Cited by 12 publications

References 53 publications

Structural insights into the coordination chemistry and reactivity of a 3,3′-bis-imine-2,2′-bipyridine ligand

Structural insights into the coordination chemistry and reactivity of a 3,3′-bis-imine-2,2′-bipyridine ligand

Solvent Effect on the Regulation of Urea Hydrolysis Reactions by Copper Complexes

A New Terbium Coordination Polymer Constructed from 4-Oxo-1(4H)quinolineacetate: Synthesis, Crystal Structure, and Fluorescent Properties

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Chlorido‐Bridged MnII Schiff‐Base Complex with Ferromagnetic Exchange Interactions

Cited by 12 publications

References 53 publications

Structural insights into the coordination chemistry and reactivity of a 3,3′-bis-imine-2,2′-bipyridine ligand

Structural insights into the coordination chemistry and reactivity of a 3,3′-bis-imine-2,2′-bipyridine ligand

Solvent Effect on the Regulation of Urea Hydrolysis Reactions by Copper Complexes

A New Terbium Coordination Polymer Constructed from 4-Oxo-1(4H)quinolineacetate: Synthesis, Crystal Structure, and Fluorescent Properties

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Chlorido‐Bridged Mn^II Schiff‐Base Complex with Ferromagnetic Exchange Interactions