The Incomplete Cubane Complexes Having Co3O4 or Mo3S4 Core with the N–N–O Type Tridentates; l-histidinato and Ethylenediamine-N-acetato

Abstract

A trinuclear cobalt(III) complex, [Co3(l-his)3(μ-OH)3(μ3-O)]ClO4·H2O (l-Hhis: l-histidine), containing an incomplete cubane Co3O4 core was isolated and the structure was compared with [Co3(edma)3(μ-OH)3(μ3-O)]+ (Hedma: NH2CH2CH2NHCH2COOH) isomers. Using the edma and l-his as N–N–O type ligands, [Mo3(L)3(μ-S)3(μ3-S)]+ complexes with a Mo3S4 incomplete cubane core were also prepared, and their structures were determined by the X-ray diffraction method. A structural similarity between [Mo3(L)3(μ-S)3(μ3-S)]+ and [Co3(L)3(μ-OH)3(μ3-O)]+ is discussed; it is suggested that three N–H···O inter-ligand (intra-molecular) attractive interaction has an important role in stabilizing the incomplete cubane structure.

Pentaaquatri-μ3-hydroxido-tris(iminodiacetato)-μ3-oxido-tetrahedro-calcium(II)tricobalt(III) 2.54-hydrate

“…Pentaaquatri-µ 3 -hydroxido-tris(iminodiacetato)-µ 3 -oxido-tetrahedro- (Ama et al, 1997(Ama et al, , 2000(Ama et al, ,2001(Ama et al, , 2006. While many such cationic [Co 3 (L) 3 (µ 2 -OH) 3 (µ 3 -O)] n+ complexes are known, we could find no mention of an anionic complex in our survey of the literature.…”

“…For the synthesis and chemistry of partial Co 3 O 4 cubane clusters, see: Ama et al (1997Ama et al ( , 2000Ama et al ( , 2001Ama et al ( , 2006. For the chemistry and structure of CaMn 4 O 4 clusters in the OEC (oxygen evolution center) of plants, see: Barber & Murray (2008); Rappaport & Diner (2008); Sauer et al (2008); Yocum (2008).…”

A Molecular Pair of [GdNi3] Tetrahedra Bridged by Water Molecules

“…[NiA C H T U N G T R E N N U N G (val) 2 ]·2H 2 O was prepared from the reaction of fresh NiCO 3 with two equivalents of lvaline. 2 ]·2H 2 O (0.98 g, 3 mmol) was added to a solution of GdA C H T U N G T R E N N U N G (NO 3 ) 3 ·6H 2 O (1.35 g, 3 mmol) in MeCN (50 mL) and the resulting light-blue mixture was stirred and heated to reflux. The color became darker and Et 4 NClO 4 (1.37 g, 6 mmol) was added to the system while stirring and heating was maintained for a few minutes.…”

“…In this context, we and others have prepared aggregates involving a variety of different metals, such as Cu, Co, or Fe. [1][2][3][4] This chemistry is extensible to the lanthanides, [5] which have attracted interest for the production of cluster nanomagnets, [6][7][8] because they usually carry a large number of unpaired electrons and can exhibit significant anisotropy. In the case of Gd III ions, the absence of anisotropy is also very appealing, because a number of Gd III -3d molecules represent excellent magnetic coolers for low-tempera-ture applications.…”

“…Methyl groups of val À ligands and hydrogen atoms are not shown for clarity. Selected interatomic distances []: NiÀO, 2.016(11) to 2.116(11); NiÀN, 2.039(14) to 2.109(15); GdÀO, 2.416(11) to 2.528(10); Ni···Ni (adjacent), 5.297(3) to 5.329(4); Ni···Gd (adjacent), 3.513(2) to 3.548(2); Gd1···Gd2, 3.886(2).…”