A Rectangular Zinc Cluster and a Rectangular Nickel Cluster That Exhibits Ferromagnetic Coupling

Saalfrank, Rolf W.; Trümmer, Stefan; Reimann, Uwe; Chowdhry, Mubarik M.; Hampel, Frank; Waldmann, Oliver

doi:10.1002/1521-3773(20001002)39:19<3492::aid-anie3492>3.0.co;2-g

Cited by 67 publications

(29 citation statements)

References 27 publications

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“…N-(2-Alkyltetrazol-5-yl)pyridine-2-carboxamides and -thioamides 160 were shown 300, 301 to react with copper(II), zinc(II), cobalt(II) and nickel(II) acetates at 20 8C to give a series of mono-, bi-and tetranuclear complexes differing appreciably in the structure of the coordination unit, which decompose only at temperatures above 250 8C [note that during the synthesis Co(II) was oxidised to Co(III)]. For the Ni 4 L 8 complexes and their solvates with metal ± metal distances of 5.56 ± 5.57 # A, a weak intramolecular ferromagnetic interaction has been found 300 A ditetrazole derivative of this type, N(2),N(6)-bis(1-methyltetrazol-5-yl)pyridine-2,6-dicarboxamide (161), has been used 303,304 for the synthesis of transition metal oxo complexes. This compound undergoes double deprotonation, and the doubly charged anion exists in solution as two rotamers, L A and L B ; these species selectively form oxo complexes of two different types, Fe 2 MOL 3 [M = Fe(II), Cu(II), Co(II), Ni(II)] and Zn 8 O 2 L 6 .…”

Section: Metal Derivatives Of Neutral N-substituted Tetrazolesmentioning

confidence: 99%

Metal derivatives of tetrazoles

Гапоник¹,

2006

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Published data on the synthesis, structure, properties Published data on the synthesis, structure, properties and applications of metal derivatives of tetrazoles are generalised and applications of metal derivatives of tetrazoles are generalised and described systematically. Compounds based on the anionic and described systematically. Compounds based on the anionic and neutral tetrazole forms, and neutral tetrazole forms, C C-and -and N N-mono-and -mono-and C C, ,N N-disubsti--disubstituted tetrazoles are considered. The bibliography includes 464 tuted tetrazoles are considered. The bibliography includes 464 references references. . ReceivedDepending on the reaction conditions, meta-and para-5,5 Hphenyleneditetrazoles 25 react with Cd, Zn and Mn(II) salts to give essentially different, as regards both composition and structure, complexes 26, 27, 44 28, 45 29. 46 The structures of compounds 26 ± 29 were determined by X-ray diffraction. Compounds 26 ± 28 in which the doubly charged anions derived from tetrazole 25 function as bridges are two-and three-dimensional coordination polymers. Conversely, compound 29 is a mononuclear aqua complex containing no metal ± tetrazole coordination bond. In the structure of complex 28, one-dimensional channels were found which occupy up to 35% of the void volume and encapsulate tetrameric cyclic water clusters and DMF molecules. On heating to 150 8C, water and DMF are removed from the channels, which accounts for the interest of researchers in this type of compound for the preparation of inclusion compounds and sorbents. A coordination polymer with a composition similar to complex K + 7

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Section: Metal Derivatives Of Neutral N-substituted Tetrazolesmentioning

confidence: 99%

Metal derivatives of tetrazoles

Гапоник¹,

2006

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“…Heteropolymetallic complexes are of current interest due to their importance in the study of charge transfer between metal centers [13], in catalysis and molecular recognition [14], and in the area of bioinorganic chemistry for their potential use as bio-mimetics for the active sites of many metalloproteins [15][16][17], especially when the bridging group between the metal atoms is of biological relevance, such as imidazolate, carboxylate, etc. A large number of homo-metallic complexes have been described [18][19][20], but hetero-metallic compounds with Schiff base ligands are still limited in number [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Heterotrinuclear manganese(II) and vanadium(IV) Schiff base complexes as epoxidation catalysts

Mohebbi

Bahrami

Shangaie

2011

Transition Met Chem

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The catalytic epoxidation of styrene using ureahydrogen peroxide and heterotrinuclear Cu(II) complexes with general formula (ML n ) 2 Cu(acac) 2 , where n = 1-3 and M = VO 2? or Mn 2? is reported. Schiff base complexes ML n involving a 3,4-diaminopyridine bridge with free coordination site were used as the ligand, where (L n ) 2-is [(5-x-Sal) 2 Py] 2 and x = H, Br or NO 2 . The complexes were characterized by physico-chemical and spectroscopic methods. The electrochemical properties of M were modified upon trinuclear complex formation. The trinuclear complexes show high catalytic activity, with up to 86% conversion and 93% selectivity, while no catalytic properties were observed for the monomeric complexes. The catalyst could be reused with some loss of activity.

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“…To this day, metallacrowns, with Mn(III), Fe(III), Ni(II), Cu(II), Zn(II), Ga(III) and V(V)O metal ions, [7], [8][9][10][11][12], [13][14][15][16], [17], [18], [19], ] [17], [20], stacking metallacrowns [21][22][23] as well as a variety of dimers and fused metallacrowns [9,13,24,25] have been reported. Metallacrowns are typically prepared using hydroxamic acids and/or ketonoximic acids as constructing ligands (Scheme 1(a)), while suitable organic molecules such as salicylhydrazides [19,20,26], picoline-tetrazolylamides [27], diethyl ketipinate [23], 3-hydroxy-2-pyridone [28] or 3-thione-1,2-dithione-4,5-dithiolato [29] have also been used.…”

Section: Introductionmentioning

confidence: 99%