Synthesis and Characterization of a Series of Edge-Sharing Octahedral−Tetrahedral−Octahedral Linear Trinuclear Complexes [M3(L1O)4]2+, Where M = Mn2+, Co2+, Ni2+, Cu2+, and Zn2+and L1OH Is the “Heteroscorpionate” Ligand (2-Hydroxyphenyl)bis(pyrazolyl)methane

Higgs, Timothy C.; Spartalian, K.; O’Connor, Charles J.; Matzanke, Berthold F.; Carrano, Carl J.

doi:10.1021/ic970844s

Cited by 78 publications

(37 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These values are in agreement with those reported in the literature for complexes where two Mn II ions are bridged by two phenolate ligands. [27,29,31,34] Comparable results are obtained for 1(ClO 4 ) 2 ·H 2 O: g ϭ 1.96 and J ϭ Ϫ2.9 cm Ϫ1 . Small deformations of the [Mn 2 O 2 ] diamond core unit could lead to the slight differences in the g and J values determined for compound 1, depending on the counterion.…”

Section: Magnetic Susceptibility Measurementsmentioning

confidence: 83%

Synthesis, Structure and Characterisation of New Phenolato-Bridged Manganese Complexes [L2Mn2]2+ − Formation by Ligand Oxidation in LaH [LaH = N-(2-hydroxybenzyl)-N,N′-bis(2-pyridylmethyl)ethane-1,2-diamine]

Hureau

Anxolabéhère‐Mallart

Nierlich

et al. 2002

Eur. J. Inorg. Chem.

View full text Add to dashboard Cite

A mononuclear [L a Mn III OAc](ClO 4 )·0.5H 2 O [2(ClO 4 )·0.5H 2 O] complex with a new amino-containing pentadentate ligand L a H with a [N 4 O] coordination sphere has been obtained. Magnetic susceptibility measurements of 2(ClO 4 )·0.5H 2 O indicated a high spin electronic configuration for the Mn III ion.In cyclic voltammetry the reversible wave observed at E 1/2 = 0.15 V vs. SCE was attributed to the reduction of Mn III into Mn II . In acetonitrile solution complex 2 spontaneously evolved into phenolato-bridged Mn II Mn II dimeric complexes with the concomitant oxidation of the ligand. X-ray diffraction structures revealed that there is indeed a 1:1 mixture of two closely related complexes: in one case both ligands L a − have been oxidised to the imine form leading to the [L i Mn II Mn II L i ] 2+ cation (1a), whereas in the other, only one ligand has been oxidised, leading to the [L a Mn II Mn II L i ] 2+ cation (1b). In both 1a and 1b, Mn II ions are in a distorted octahedral environment. Crystallographic data indicated that the Mn 2 O 2 core is similar for 1a and 1b. The complete spectroscopic and electrochemical studies performed on powder

show abstract

Section: Magnetic Susceptibility Measurementsmentioning

confidence: 83%

Synthesis, Structure and Characterisation of New Phenolato-Bridged Manganese Complexes [L2Mn2]2+ − Formation by Ligand Oxidation in LaH [LaH = N-(2-hydroxybenzyl)-N,N′-bis(2-pyridylmethyl)ethane-1,2-diamine]

Hureau

Anxolabéhère‐Mallart

Nierlich

et al. 2002

Eur. J. Inorg. Chem.

View full text Add to dashboard Cite

show abstract

“…2) Steric shielding of the metal binding site provides extra kinetic stability for the complexes and decreases the propensity of the adjacent hydroxy group to adopt a bridging position between two metal ions. [39] 3) It is important to prevent the formation of Michael adducts between the substrate amine and the ligand in its p-benzoquinone state by steric protection, with regard to amine oxidase model systems in particular. [40] Triisopropylsilyl derivative 2 c (Scheme 1) was synthesised to gain access to a ligand that shuttles between the p-hydroquinone and the p-semiquinone radical state (one-electron transition) rather than between the p-hydroquinone and the p-benzoquinone forms (two-electron transition).…”

Section: Resultsmentioning

confidence: 99%

Redox‐Active p‐Quinone‐Based Bis(pyrazol‐1‐yl)methane Ligands: Synthesis and Coordination Behaviour

Scheuermann

Kretz

Vitze

et al. 2008

Chemistry A European J

View full text Add to dashboard Cite

The synthesis, structural characterisation and coordination behaviour of mono- and ditopic p-hydroquinone-based bis(pyrazol-1-yl)methane ligands is described (i.e., 2-(pz2CH)C6H3(OH)2 (2a), 2-(pz2CH)-6-(tBu)C6H2(OH)2 (2b), 2-(pz2CH)-6-(tBu)C6H2(OSiiPr3)(OH) (2c), 2,5-(pz2CH)2C6H2(OH)2 (4)). Ligands 2a, 2b and 4 can be oxidised to their p-benzoquinone state on a preparative scale (2a ox, 2b ox, 4 ox). An octahedral Ni II complex [trans-Ni(2c)2] and square-planar Pd II complexes [Pd2bCl2] and [Pd2b ox Cl2] have been prepared. In the two Pd II species, the ligands are coordinated only through their pyrazolyl rings. The fact that [Pd2bC12] and [Pd2b oxC12] are isolable compounds proves that redox transitions involving the p-quinone substituent are fully reversible. In [Pd2b oxCl2], the methine proton is highly acidic and can be abstracted with bases as weak as NEt(3). The resulting anion dimerises to give a dinuclear macrocyclic Pd II complex, which has been structurally characterised. The methylated ligand 2-(pz2CMe)C6H3O2 (11 ox) and its Pd II complex [Pd11 oxCl2] are base-stable. A new class of redox-active ligands is now available with the potential for applications both in catalysis and in materials science.

show abstract

“…Stelzig et al [6] have reported the complexes [Mn II 2 L 3 (µ 3 -OMe)(MeOH)] 2 and Na[Mn II 3 (L 3 ) 2 (µ 2 -OAc)]·H 2 O·0.25THF, where L 3 ϭ 1,5-bis(3-Cl, 5-NO 2 -salicylideneamino)pentan-3-ol, a voluminous pentadentate ligand. The Mn 2ϩ coordination arrange- [7] To confirm the difference in the manganese environments in 2 and 3 we have recorded the MnK XANES (X-ray Absorption Near Edge Structure) spectra for these com- pounds ( Figure 4). The maximum B in the spectra of 2 and 3 ( Figure 4) corresponds to an electron transition from the Mn1s to the Mn4p level.…”

Section: Structures Of Compounds 1 Andmentioning

confidence: 99%

Two Molecular-Type Complexes of the Octahedral Rhenium(III) Cyanocluster Anion [Re6Se8(CN)6]4− with M2+ (Mn2+, Ni2+)

Artemkina

Naumov

Вировец

et al. 2002

Eur. J. Inorg. Chem.

View full text Add to dashboard Cite

Two novel octahedral rhenium(III) selenocyanide cluster complexes [(nBu) 4 N] 2 Ni(H 2 O) 5 [Re 6 Se 8 (CN) 6 ]·2H 2 O (1) and [(nBu) 4 N] 2 Mn(H 2 O) 4 [Re 6 Se 8 (CN) 6 ]·2H 2 O (2) have been prepared by the reaction of K 4 [Re 6 Se 8 (CN) 6 ]·3.5H 2 O, (nBu) 4 NBr and Ni(OAc) 2 (or MnSO 4 ) in aqueous solution. The complexes have been structurally solved in the orthorhombic unit cell Pbca with parameters: a = 19.393(2), b = 17.292(2), c = 37.255(4) Å for 1, and a = 19.518(4), b = 17.488(3), c = 37.997(5) Å for 2. The cluster anions and M 2+ form ionic pairs

show abstract

Synthesis and Characterization of a Series of Edge-Sharing Octahedral−Tetrahedral−Octahedral Linear Trinuclear Complexes [M₃(L1O)₄]²⁺, Where M = Mn²⁺, Co²⁺, Ni²⁺, Cu²⁺, and Zn²⁺and L1OH Is the “Heteroscorpionate” Ligand (2-Hydroxyphenyl)bis(pyrazolyl)methane

Cited by 78 publications

References 27 publications

Synthesis, Structure and Characterisation of New Phenolato-Bridged Manganese Complexes [L2Mn2]2+ − Formation by Ligand Oxidation in LaH [LaH = N-(2-hydroxybenzyl)-N,N′-bis(2-pyridylmethyl)ethane-1,2-diamine]

Synthesis, Structure and Characterisation of New Phenolato-Bridged Manganese Complexes [L2Mn2]2+ − Formation by Ligand Oxidation in LaH [LaH = N-(2-hydroxybenzyl)-N,N′-bis(2-pyridylmethyl)ethane-1,2-diamine]

Redox‐Active p‐Quinone‐Based Bis(pyrazol‐1‐yl)methane Ligands: Synthesis and Coordination Behaviour

Two Molecular-Type Complexes of the Octahedral Rhenium(III) Cyanocluster Anion [Re6Se8(CN)6]4− with M2+ (Mn2+, Ni2+)

Contact Info

Product

Resources

About