Diphenoxo-bridged dinuclear nickel(II) complex of a dinucleating macrocycle with N(amine)6O2 metal-binding sites: synthesis, X-ray crystal structure and electrochemistry

Yan, Wanjun; Ma, Chunchi; Wu, Jinguang; Zhang, Wen-xing; Jiang, De‐Hua

doi:10.1016/s0020-1693(98)00420-4

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…Moreover, complexes 3 and 4 were electrochemically oxidized at room temperature in acetonitrile solution. The cyclic voltammograms showed a quasi-reversible oxidation peaks at around 0.96 and 0.88 V for 3 and 4 respectively (Figure S13, Supporting Information), which can be attributed to the Ni II /Ni III couple …”

Section: Resultsmentioning

confidence: 85%

Di-, Tri-, and Tetranuclear Nickel(II) Complexes with Oximato Bridges: Magnetism and Catecholase-like Activity of Two Tetranuclear Complexes Possessing Rhombic Topology

et al. 2013

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Oxime-based tridentate Schiff base ligands 3-[2-(diethylamino)ethylimino]butan-2-one oxime (HL(1)) and 3-[3-(dimethylamino)propylimino]butan-2-one oxime (HL(2)) produced the dinuclear complex [Ni2L(1)2](ClO4)2 (1) and trinuclear complex [Ni3(HL(2))3(μ3-O)](ClO4)4·CH3CN (2), respectively, upon reaction with Ni(ClO4)2·6H2O. However, in a slightly alkaline medium, both of the ligands underwent hydrolysis and resulted in tetranuclear complexes [{Ni(deen)(H2O)}2(μ3-OH)2{Ni2(moda)4}](ClO4)2·2CH3CN (3) and [{Ni(dmpn)(CH3CN)2}2(μ3-OH)2{Ni2(moda)4}](ClO4)2·CH3CN (4), where deen = 2-(diethylamino)ethylamine, dmpn = 3-(dimethylamino)-1-propylamine, and modaH = diacetyl monoxime. All four complexes have been structurally characterized. Complex 1 is a centrosymmetric dimer where the square planar nickel(II) atoms are joined solely by the oximato bridges. In complex 2, three square planar nickel atoms form a triangular core through a central oxido (μ3-O) and peripheral oximato bridges. Tetranuclear complexes 3 and 4 consist of four distorted octahedral nickel(II) ions held together in a rhombic chair arrangement by two central μ3-OH and four peripheral oximato bridges. Magnetic susceptibility measurements indicated that dinuclear 1 and trinuclear 2 exhibited diamagnetic behavior, while tetranuclear complexes 3 and 4 were found to have dominant antiferromagnetic intramolecular coupling with concomitant ferromagnetic interactions. Despite its singlet ground state, both 3 and 4 serve as useful examples of Kahn's model for competing spin interactions. High-frequency EPR studies were also attempted, but no signal was detected, likely due to the large energy gap between the ground and first excited state. Complexes 3 and 4 exhibited excellent catecholase-like activity in the aerial oxidation of 3,5-di-tert-butylcatechol to the corresponding o-quinone, whereas 1 and 2 did not show such catalytic activity. Kinetic data analyses of this oxidation reaction in acetonitrile revealed that the catalytic activity of 3 (kcat = 278.4 h(-1)) was slightly lower than that of 4 (kcat = 300.0 h(-1)). X-band EPR spectroscopy indicated that the reaction proceeded through the formation of iminoxyl-type radicals.

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Section: Resultsmentioning

confidence: 85%

Di-, Tri-, and Tetranuclear Nickel(II) Complexes with Oximato Bridges: Magnetism and Catecholase-like Activity of Two Tetranuclear Complexes Possessing Rhombic Topology

et al. 2013

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“…Removal of the protecting ethylene group was achieved with sodium in liquid ammonia followed by acidic work-up. This gave the bis-thiophenol ligand H2L2 as the hexa-hydrochloride in 63% yield [14].…”

Section: Ig a N D Syn Th Esesmentioning

confidence: 99%

Synthesis and Coordination Chemistry of Novel Binucleating Macrocyclic Ligands with Amine-thioether and Amine-thiophenolate Donor Functions

Klingele

Steinfeld

Kersting

2001

Zeitschrift Für Naturforschung B

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The ability of the aromatic tetraaldehyde l,2-bis(4-rm-butyl-2,6-diformylphenylsulfanyl)ethane (1 ) to function as a precursor in the preparation of binucleating hexaamine-dithiolate lig ands has been investigated. Reductive amination of compound 1 with bis(aminoethyl)amine un der medium-dilution conditions affords the macrobicyclic hexaamine-dithioether compound L 1. Deprotection of the [1+2] condensation product gives the corresponding 24-membered hexaamine-dithiophenol ligand H2L2. The formulation of L 1 as a macrobicyclic amine-thioether was confirmed by an X-ray crystal structure determination of the tetranuclear nickel(II) complex of L 1, [{ (L jN iiC lili^-C l^K B P h ;) (2b). The formulation of the doubly deprotonated form (L2)2-of H2L2 as a 24-membered amine-thiophenolate ligand was confirmed by an X-ray crystal structure determination of the dinuclear cobalt(III) complex, [(L2)Com(^-OH)](C1 0 4 ) 2 • Cl (3). The preparation and the crystal structures of the new compounds are described.

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“…162 It was observed that hydroxo bridged species are predominant at basic pH values. 163 The protonation and metal ion (Cu II , Zn II , Cd II , Pb II ) complexation abilities of mixed donor ditopic cryptands typified by structure L 242 have been described. 164 The first reported metal complex of the large calix [12]arene ligand H 12 L 243 has been reported.…”

Section: Ligands Of Higher Denticitymentioning

confidence: 99%

Untitled

Fallis¹

2001

Annu. Rep. Prog. Chem., Sect. A

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Diphenoxo-bridged dinuclear nickel(II) complex of a dinucleating macrocycle with N(amine)6O2 metal-binding sites: synthesis, X-ray crystal structure and electrochemistry

Cited by 9 publications

References 17 publications

Di-, Tri-, and Tetranuclear Nickel(II) Complexes with Oximato Bridges: Magnetism and Catecholase-like Activity of Two Tetranuclear Complexes Possessing Rhombic Topology

Di-, Tri-, and Tetranuclear Nickel(II) Complexes with Oximato Bridges: Magnetism and Catecholase-like Activity of Two Tetranuclear Complexes Possessing Rhombic Topology

Synthesis and Coordination Chemistry of Novel Binucleating Macrocyclic Ligands with Amine-thioether and Amine-thiophenolate Donor Functions

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