Structural, magnetic and related attributes of some oximate-bridged tetranuclear nickel(ii) rhombs and a dinuclear congenerElectronic supplementary information (ESI) available: mass spectra, χT vs. T, response of magnetic properties, low-lying spin levels and UV-VIS data. See http://www.rsc.org/suppdata/dt/b3/b300539a/

Abstract

New oximate-bridged tetranuclear nickel() complexes of compositions {Ni(Dien)} 2 (µ 3 -OH) 2 {Ni 2 (Moda) 5) and the dinuclear complex (Ni{Odien}) 2 -(Moda) 2 (ClO 4 ) 2 (6) have been prepared (Dien = 1,5-diamino-3-azapentane, Odien = 1,5-diamino-3-oxapentane, Sdien = 1,5-diamino-3-thiapentane, ModaH = butane-2,3-dione monooxime, InafH = phenylglyoxaldoxime). X-ray examination revealed similar structures for 1a, 1b, 1c, 2 and 3, with a rhombic "chair" (out-of-phase "butterfly") arrangement of the four nickel() atoms and two hydroxo-bridges. The complexes were examined by magnetochemistry, UV-VIS spectroscopy and voltammetry. 1-3 display antiferromagnetic coupling of the central with the terminal nickel() atoms and ferromagnetic spin alignment between the central nickel() atoms. In contrast, all the spin exchanges in 4 and 5 were found to be antiferromagnetic, as is the coupling in dinuclear 6.

Aqua[1-(pyridin-2-yl)ethanone oximato][1-(2-pyridin-2-yl)ethanone oxime]copper(II) perchlorate monohydrate

“…For the coordination chemistry of oximes, see: Chaudhuri (2003); Pavlishchuk et al (2003). For related structures, see: Qiu et al (2011); Wu & Wu (2008); Zuo et al (2007).…”

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Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.010 Å; disorder in main residue; R factor = 0.037; wR factor = 0.096; data-to-parameter ratio = 7.8. metal-organic compounds m874 Zhong et al

CommentThere is a new interest in the coordination chemistry of oximes (Davidson et al, 2007;Pavlishchuk et al, 2003;Chaudhuri, 2003). 2-pyridyl oximes are a subclass of oximes whose anions are versatile ligands for a variety of research objectives and have been key ligands in several areas of molecular magnetism, including single-molecule and singlechain magnets (Clerac et al, 2002).

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Triethylammonium (indane-1,2,3-trione 1,2-dioximato-κ2N1,O2)(indane-1,2,3-trione 2-oximato 1-oxime-κ2N1,O2)nickel(II)

“…There is currently a renewed interest in the coordination chemistry of oximes (Davidson et al, 2007;Pavlishchuk et al, 2003). The planar aromatic polyoxime ligand indane-1,2,3-trione-1,2-dioxime abbreviated as H 2 Itdo, was used for the synthesis of the title compound.…”

“…For theoretical research on their magnetic properties, see: Pavlishchuk et al (2003). For a related structure, see: Chen et al (2010).…”

“…

Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.005 Å; R factor = 0.044; wR factor = 0.075; data-to-parameter ratio = 12.3.

CommentThere is currently a renewed interest in the coordination chemistry of oximes (Davidson et al, 2007;Pavlishchuk et al, 2003). The planar aromatic polyoxime ligand indane-1,2,3-trione-1,2-dioxime abbreviated as H 2 Itdo, was used for the synthesis of the title compound.

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