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showing 10 items of 1745 documents
Crystal structure and magnetic properties of the single-μ-chloro copper(II) chain [Cu(bipy)Cl2] (bipy = 2,2′-bipyridine)
1999
Abstract The crystal and molecular structure of the copper(II) chain [Cu(bipy)Cl2] (1) (bipy = 2,2′-bipyridine) has been determined by X-ray diffraction methods. The crystal structure of 1 consists of neutral single chloro-bridged copper(II) chains with alternating short and long Cu–Cl distances through a screw axis parallel to a. The copper surrounding is best described as distorted square pyramidal, the equatorial plane being built by the two nitrogen atoms of the chelating bipy and two chlorine atoms (one terminal and the other bridging), whereas the apical position is filled by the bridging chlorine atom from the symmetry-related adjacent unit. The equatorial Cu–Cl bonds (2.291(3) and 2…
Oxalate‐Based 3D Chiral Magnets: The Series [Z II (bpy) 3 ][ClO 4 ][M II Fe III (ox) 3 ] (Z II = Fe, Ru; M II = Mn, Fe; bpy = 2,2'‐Bipyridine; ox = O…
2005
The synthesis, structure, and physical properties of the oxalate-based molecular magnets with the formula [ZII(bpy)3][ClO4][MIIFeIII(ox)3] (ZII = Fe, Ru; MII = Mn, Fe; bpy = 2,2'-bipyridine; ox = oxalate dianion) are presented here. All compounds are isostructural and crystallize in the chiral cubic space group P4132, and contain three-dimensional dimetallic networks formed by alternating MII and MIII ions that are connected by oxalate anions. These compounds exhibit strong antiferromagnetic interactions that give rise to magnetic ordering as ferrimagnets or weak ferromagnets, with critical temperatures of up to 20 K, which is twice as high as those found for the isostructural magnets based…
Identification of the reaction products of (2'-5')oligoadenylate synthetase in the marine sponge.
1998
Previously we reported on the presence of a high (2'-5')oligoadenylate synthetase activity in the marine sponge Geodia cydonium [Kuusksalu, A., Pihlak, A., Muller, W. E. G. & Kelve, M. (1995) Eur. J. Biochem. 232, 351-357]. The presence of (2'-5')oligoadenylates [(2'-5')A] in crude sponge extract was shown by radioimmunoassay and by their HPLC comigration with authentic (2'-5')A oligomers. In addition, the sponge (2'-5')oligoadenylates displayed biological activity, as determined by inhibition studies of protein biosynthesis in rabbit reticulocyte lysate. In the present study individual (2'-5')oligoadenylates synthesized by sponge enzyme were separated by HPLC. The exact composition of ever…
A counterion study of a series of [Cu(P^P)(N^N)][A] compounds with bis(phosphane) and 6-methyl and 6,6′-dimethyl-substituted 2,2′-bipyridine ligands …
2021
The syntheses and characterisations of a series of heteroleptic copper(i) compounds [Cu(POP)(Mebpy)][A], [Cu(POP)(Me2bpy)][A], [Cu(xantphos)(Mebpy)][A] and [Cu(xantphos)(Me2bpy)][A] in which [A]− is [BF4]−, [PF6]−, [BPh4]− and [BArF4]− (Mebpy = 6-methyl-2,2′-bipyridine, Me2bpy = 6,6′-dimethyl-2,2′-bipyridine, POP = oxydi(2,1-phenylene)bis(diphenylphosphane), xantphos = (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphane), [BArF4]− = tetrakis(3,5-bis(trifluoromethyl)phenyl)borate) are reported. Nine of the compounds have been characterised by single crystal X-ray crystallography, and the consequences of the different anions on the packing interactions in the solid state are discussed. T…
Enantiomer Separation of Tris(2,2′-bipyridine)ruthenium(II): Interaction of a D3-Symmetric Cation with a C2-Symmetric Anion
2015
A compound widely used in the separation of the enantiomers of Δ,Λ-[Ru(bipy)3]2+ (bipy = 2,2′-bipyridine) and originally described as “a curious lattice compound” with the formula Δ-[Ru(bipy)3]3[Sb2(R,R-tart)2]2I2·18H2O (tart = tetradeprotonated, carboxyl and hydroxyl, tartaric acid anion) has been crystallographically characterized as this species with a slightly higher degree of hydration (19.5H2O). The crystal lattice has a layered structure in which sheets containing Δ-[Ru(bipy)3]2+ cations and iodide anions alternate with those containing [Sb2(R,R-tart)2]2– anions and water. The role of the iodide ions, which lie in pseudohexagonal cavities formed by the array of three inequivalent but…
[23] Ratio of reduced to oxidized glutathione as indicator of oxidative stress status and DNA damage
1999
Publisher Summary This chapter discusses the ratio of reduced to oxidized glutathione (GSH) as an indicator of oxidative stress status and DNA damage. Several methods have been proposed for the determination of GSH status in biological samples. Accurate determination of this status is largely dependent on the prevention of GSH autoxidation during sample processing. As the disulfide form (GSSG) is present only in minimal amounts with respect to the reduced form, a small GSH autoxidation during sample processing can give erroneously high GSSG level. The chapter describes high-performance liquid chromatography (HPLC) method for determining GSSG. It also presents a method for glutathione determ…
CCDC 1493778: Experimental Crystal Structure Determination
2019
Related Article: Rajendhraprasad Tatikonda, Massimo Cametti, Elina Kalenius, Antonino Famulari, Kari Rissanen, Matti Haukka|2019|Eur.J.Inorg.Chem.|2019|4463|doi:10.1002/ejic.201900579
CCDC 1949029: Experimental Crystal Structure Determination
2020
Related Article: Kalle Kolari, Evgeny Bulatov, Rajendhraprasad Tatikonda, Kia Bertula, Elina Kalenius, Nonappa, Matti Haukka|2020|Soft Matter|16|2795|doi:10.1039/C9SM02186H
CCDC 1814349: Experimental Crystal Structure Determination
2018
Related Article: Raminder S. Mulla, Marikka S. Beecroft, Robert Pal, Juan A. Aguilar, Javier Pitarch‐Jarque, Enrique García‐España, Elena Lurie‐Luke, Gary J. Sharples, J. A. Gareth Williams|2018|Chem.-Eur.J.|24|7137|doi:10.1002/chem.201800026
CCDC 1477312: Experimental Crystal Structure Determination
2016
Related Article: Rajendhraprasad Tatikonda, Sandip Bhowmik, Kari Rissanen, Matti Haukka, Massimo Cametti|2016|Dalton Trans.|45|12756|doi:10.1039/C6DT02008A