The assembly of pentanuclear nickel(ii) complexes from asymmetric compartmental ligands and bearing μ₃-OH bridges

Asymmetric zinc(ii) complexes as functional and structural models for phosphoesterases

“…The software used for data processing was TOPSPIN 2.1. 13 C NMR spectra were recorded at room temperature with a 100 MHz Bruker AV 400/500 spectrometer. Chemical shifts are given in δ units relative to CDCl 3 (central line of triplet: δ C = 77.0), d 4 -MeOD (δ C = 49.0), CD 3 CN (δ C = 1.30), D 2 O with 5% dioxane (δ C = 67.2).…”

The assembly of oligonuclear nickel(II) complexes from asymmetric compartmental ligands in the presence of alkali metal salts

“…3. We have recently reported [8] the formation of homopentanuclear nickel(II) clusters from the reaction of closely related asymmetric Schiff base compartmental proligands with Ni(OAc) 2 but to our knowledge this heteropentanuclear cluster is unique.…”

A heteronuclear [nickel(II)–sodium] infinite chain complex derived from 3-{[(2-diethylamino-ethyl)-methyl-amino]-methyl}-2-hydroxy-5-methyl-benzaldehyde

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The asymmetric compartmental proligand HL bearing a tridentate N 2 O donor set and a bidentate OO donor set has given the novel heteronuclear [Ni(II)-Na] infinite chain polymer in which the molecular structure has a repeating Na/Ni 5 unit of formula [Ni 5 Na(L) 2 (OAc) 6 (OH) 2 (BPh 4 )] n .Adams et al [1] have synthesised homopentanuclear nickel complexes based on unsymmetrical Schiff base compartmental ligands. In these complexes, of generic formula [Ni 5 L 0 2 (OAc) 6 (OH) 2 ], all ligands have the same characteristics, an N 2 O aminic donor compartment and an NO iminic donor compartment.

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“…Adams et al [1] have synthesised homopentanuclear nickel complexes based on unsymmetrical Schiff base compartmental ligands. In these complexes, of generic formula [Ni 5 L 0 2 (OAc) 6 (OH) 2 ], all ligands have the same characteristics, an N 2 O aminic donor compartment and an NO iminic donor compartment.…”

“…The proligand HL [6] (150 mg, 0.540 mmol) and Ni(OAc) 2 Á 4H 2 O (269 mg, 1.080 mmol) were refluxed together in methanol (20 cm 3 ) for 30 min, NaBPh 4 (395 mg, 1.080 mmol) was added and the resulting solution allowed to cool to r.t. giving green crystals suitable for X-ray structure determination. 1 The molecular structure is a repeating Na/Ni 5 unit of formula [Ni 5 Na-(L 4 ) 2 (OAc) 6 (OH) 2 (BPh 4 )] n , formed of pentanuclear Ni(II) clusters bridged by a Na cation. This unit repeats as long chains throughout the crystal structure and a depiction of one of these Na/Ni 5 chains is shown in Fig.…”