2005
DOI: 10.1002/chem.200400945
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Abstract: Pyrazolate-based dinucleating ligands with thioether-containing chelate arms have been used for the synthesis of a family of novel tetranuclear nickel(II) complexes [L2Ni4(N3)3(O2CR)](ClO4)2 that incorporate three azido bridges and one carboxylate (R = Me, Ph). Molecular structures have been elucidated by X-ray crystallography in four cases, revealing Ni4 cores with a unique topology in which two of the azido ligands adopt an unusual mu3-1,1,3 bridging mode. The compounds were further characterized by mass spe… Show more

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Cited by 99 publications
(61 citation statements)
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“…The azido ligands thus adopt a rare m-1,1,3 bridging mode in which all NiÀN azide distances lie in the narrow range 2.109(2)-2.189(2) . Genuine m-1,1,3 coordination of azido ligands has only recently been discovered in some molecular Ni 4 systems, [21] while in most previous examples of m 3 -1,1,3-azide binding at least one of the NiÀN azide bonds was much longer and better described as semicoordinating.…”
Section: Treatment Of Lmentioning
confidence: 98%
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“…The azido ligands thus adopt a rare m-1,1,3 bridging mode in which all NiÀN azide distances lie in the narrow range 2.109(2)-2.189(2) . Genuine m-1,1,3 coordination of azido ligands has only recently been discovered in some molecular Ni 4 systems, [21] while in most previous examples of m 3 -1,1,3-azide binding at least one of the NiÀN azide bonds was much longer and better described as semicoordinating.…”
Section: Treatment Of Lmentioning
confidence: 98%
“…In its deprotonated form L À this ligand was previously shown to nest two high-spin (S = 1) nickel(II) ions in its binding sites and to afford a variety of nickel(II) azido complexes. [21,23,31,32] These may feature unusual azide binding modes in oligonuclear aggregates [21,23] as well as a certain geometrical flexibility of the central azide ion that is hosted between the two metal ions of the bimetallic array, [32] which led us to expect a series of related yet distinct 1D systems from a single dinickel(II) precursor.…”
Section: Synthesis and Structural Characterization Of The Complexesmentioning
confidence: 99%
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“…Some compounds have been described in which the two different bridges simulA C H T U N G T R E N N U N G taneously connect the same pair of metal ions [11] or separately connect different metal pairs [12] to give clusters [13,14] (including a few SMMs [14] ) and coordination polymers. [11][12][15][16][17][18][19] The compounds were usually derived from anionic carboxylate ligands (in their deprotonated form), such as pyridinecarboxylates and their N-oxides, [15] formate, acetate, [13,16,17] and a few phenyl-based aromatic carboxyl-A C H T U N G T R E N N U N G ates. [11, 12a, 18] Recently, we demonstrated that the use of zwitterionic dicarboxylate ligands with cationic pyridinium and anionic carboxylate groups is an easy and efficient approach to 2D or 3D networks containing 1D chains with azide and carboxylate bridges.…”
Section: Introductionmentioning
confidence: 99%