Search results for "Dimer"

Synthesis, X-ray structure and magnetic properties of the azido adducts of quadridentate Schiff base manganese(III) complexes

2004

Abstract Two new azido derivatives of quadridentate Schiff base manganese(III) complexes have been synthesized and characterized structurally and magnetically. X-ray structure analysis revealed that both complexes viz. [Mn2(L1)2(N3)2] (1) and [Mn2(L2)2(N3)2] (2), where H2L1=N,N′-(1,1-dimethylethylene)-bis-(salicylaldiimine) and H2L2=bis(o-hydroxyacetophenone)-ethylenediimine exist as phenoxo-bridged dimer. The magnetic susceptibility of the complexes has been measured in the 5–300 K range. At room temperature the MnIII ions in complexes 1 and 2 possess an S=4 ground state. The global magnetic interaction in complex 1 is found to be ferromagnetic, while for complex 2 it is anti-ferromagnetic.

Asymmetric bis-(μ1,1-azido) bridged dinuclear copper(II) complex with N2O donor Schiff base: synthesis, structure and magnetic study

2015

A copper(II) complex, [Cu2(L)2(N3)2] [where HL = 2-((3-(methylamino)propylimino)methyl)-6-methoxyphenol] has been synthesized and characterized by elemental analysis, IR, UV–vis and fluorescence spectroscopy, and single-crystal X-ray diffraction studies. The complex crystallizes in the trigonal space group R. The deprotonated tridentate Schiff base occupies three coordination sites of copper(II). The fourth coordination site is occupied by an azide. A symmetry-related azide from a different molecule coordinates with the fifth site of copper(II), thereby forming a double end-on azide-bridged centrosymmetric dimer. Variable temperature solid–state magnetic studies between 2 and 300 K were car…

Synthesis, structural aspects and magnetic properties of an unusual 2D thiocyanato-bridged cobalt(II)–Schiff base network

2010

Abstract A new two-dimensional (2D) thiocyanato-bridged cobalt(II) network formulated as [LCo2(NCS)2]n (1), has been synthesized with the Schiff base ligand N,N′-bis(3-methoxysalicylidenimino)-1,3-diaminopropane (H2L) and thiocyanate anions. This novel layered compound has been completely characterized by elemental analysis, FT-IR, UV–Vis spectroscopy and the structure has been established by single crystal X-ray diffraction studies. The structure of 1 consists of a doubly phenoxo-bridged dimer comprising two different cobalt(II) centers with different coordination geometries (octahedral and tetrahedral). The 2D network is accomplished by bridging thiocyanate ligands, connecting the dimeric…

Magnetic and catalytic properties of a new copper(II)–Schiff base 2D coordination polymer formed by connected helical chains

2011

Abstract A dicyanamide bridged 2D polynuclear complex of copper(II) having molecular formula [Cu2(L)(μ1,5-dca)2]n (1) has been synthesized using the Schiff base ligand N,N′-bis(salicylidene)-1,3-diaminopentane, (H2L) and sodium dicyanamide (dca). The complex presents a 2D hexagonal structure formed by 1,5-dca singly bridged helical chains connected through double 1,5-dca bridges. The chelating characteristics of the H2L Schiff base ligand results in the formation of copper(II) dimer with a double phenoxo bridge presenting a very strong antiferromagnetic coupling in the copper(II) derivative (1) (J = −510 cm−1). The dimeric asymmetric unit of 1 is very similar to the active site of the catec…

Nutritional epigenomic and DNA-damage modulation effect of natural stilbenoids

2023

The aim of the present work is the evaluation of biological effects of natural stilbenoids found in Vitis vinifera, with a focus on their activity as epigenetic modulators. In the present study, resveratrol, pterostilbene and for the first time their dimers (±)-trans-δ-viniferin, (±)-trans-pterostilbene dehydrodimer were evaluated in Caco-2 and HepG-2 cell lines as potential epigenetic modulators. Stilbenoids were added in a Caco-2 cell culture as a model of the intestinal epithelial barrier and in the HepG-2 as a model of hepatic environment, to verify their dose-dependent toxicity, ability to interact with DNA, and epigenomic action. Resveratrol, pterostilbene, and (±)-trans-pterostilbene…

PROGNOSTIC VALUE OF D-DIMER PLASMA LEVELS IN PATIENTS WITH ADVANCED SOLID TUMORS

2012

Design of carborane molecular architectures with electronic structure computations: From endohedral and polyradical systems to multidimensional netwo…

2009

11 pags, 6 figs. -- 19th International Conference on Physical Organic Chemistry (ICPOC-19) 13–18 July 2008, Santiago de Compostela, Spain

SiRNA-mediated selective inhibition of mutant keratin mRNAs responsible for the skin disorder pachyonychia congenita.

2006

RNA interference offers a novel approach for treating genetic disorders including the rare monogenic skin disorder pachyonychia congenita (PC). PC is caused by mutations in keratin 6a (K6a), K6b, K16, and K17 genes, including small deletions and single nucleotide changes. Transfection experiments of a fusion gene consisting of K6a and a yellow fluorescent reporter (YFP) resulted in normal keratin filament formation in transfected cells as assayed by fluorescence microscopy. Similar constructs containing a single nucleotide change (N171K) or a three-nucleotide deletion (N171del) showed keratin aggregate formation. Mutant-specific small inhibitory RNAs (siRNAs) effectively targeted these site…

Über die oligomerisierung von Cycloocten

1972

Cycloocten wurde in Anwesenheit des Katalysatorsystems WCl6/C2H5OH/C2H5AlCl2 oligomerisiert mit dem Ziel, die homologe Reihe (C8H14)n darzustellen. Es wurden die Reaktionsbedingungen, besonders hinsichtlich der Katalysator-Konzentration, und der Einflus des Losungsmittels untersucht. Die isolierten Oligomeren (Dimeres, Trimeres) wurden IR-, NMR- und massenspektrometrisch charakterisiert. Cyclooctene was oligomerized in the presence of the catalytic system WCl6/C2H5OH/C2H5AlCl2 in order to prepare the homologous series (C8H14)n. The conditions of reaction were established particularly with respect to the catalyst concentration. The influence of the solvent was investigated. The oligomers pre…

CCDC 197178: Experimental Crystal Structure Determination

2004

Related Article: M.L.Calatayud, J.Sletten, I.Castro, M.Julve, G.Seitz, K.Mann|2003|Inorg.Chim.Acta|353|159|doi:10.1016/S0020-1693(03)00221-4