Ruthenium acetato complexes

The data on the synthesis of di- and trinuclear ruthenium acetato complexes are generalized, and the structure and magnetic properties of the complexes are reviewed. The spectral and electrochemical parameters necessary for the identification of the acetato complexes in various solvents are reported. © 1999 MAEe cyrillic signK "Hayκa/Interperiodica"

Electronic absorption spectra and structures of the conjugate acids of 5-hydroxy- and 5-aminoanthraquinonepyridines

The structures of 5-hydroxy and 5-amino derivatives of naphtho[2,3-h]quinoline-7,12-dione (anthraquinonepyridine) and their conjugate acids were investigated by experimental and computational [Pariser-Parr-Pople (PPP)] methods. The hydroxy derivative exists in the keto form, while the cation of the hydroxy form is formed during protonation; the amino derivative exists in the amino form but is converted to a cation with an imino structure upon protonation. In both cases the addition of a proton is accompanied by rearrangement of the π-electon structure of the molecules. The assignment of the Sππ* transitions in the electronic spectra of the bases and their conjugate acids is given on the basis of a quantum-chemical calculation. © 1981 Plenum Publishing Corporation

Ruthenium acetato complexes

The data on the synthesis of di- and trinuclear ruthenium acetato complexes are generalized, and the structure and magnetic properties of the complexes are reviewed. The spectral and electrochemical parameters necessary for the identification of the acetato complexes in various solvents are reported. © 1999 MAEe cyrillic signK "Hayκa/Interperiodica"

Structure of ammonium decachloro-μ-oxodiosmate(IV) (NH4) 4[Os2OCl10] and its behavior in solutions

The structure of (NH4)4[OS2OCl 10] has been determined by X-ray diffraction. The crystals are tetragonal, space group I4/mmm, a = 7.292(1) Å, c = 17.157(3) Å, Z = 2. The binuclear anion has D 4h symmetry; the osmium atom is coordinated to five chlorine atoms and the oxygen atom. The Os-O distances are 1.8242(5) Å; Os-Cleqv, 2.3743(18) Å; Os-Clax, 2.335(3) Å; the Cl1OsCl2 angle is 86.84(4). The anion has been established spectrophotometrically to remain structurally unchanged in freshly prepared aqueous and hydrochloric acid solutions. Slow aquation with retention of a binuclear structure occurs with time in 1 and 6 M HCl. At 75 or 90 C, the process is faster with the disrupture of the Os-O-Os bond and the formation [OsCl6]2- ions in 6 M HCl and a mixture of [OsCl6]2- and [Os(H2O)Cl 5]- ions in 1 M HCl. © 2013 Pleiades Publishing, Ltd

Бромодиметилсульфоксидные комплексы осмия(II). Молекулярная структура cis,fac-[OsBr2(dmso-S)3(dmso-O)]

Bromo dimethyl sulfoxide osmium(II) complexes were synthesized: trans-[OsBr2(dmso-S)4] (1) was obtained by the reaction of K2[OsBr6] with DMSO in the presence of SnBr2 at 100°C and cis,fac-[OsBr2(dmso-S)3(dmso-O)] (2) was prepared by thermal isomerization of 1 in a DMSO solution at 150°C. The coordination mode of DMSO molecules was determined by IR and 1H and 13C NMR spectroscopy. X-ray diffraction analysis showed that compound 2 crystallizes in the monoclinic system, space group P21/n; a = 8.4711(5) Å, b = 27.7876(15) Å, c = 8.5569(5) Å, β = 115.7110(10)°; Z = 4. The coordination polyhedron of osmium is a distorted octahedron; the osmium environment is formed by two cis-arranged bromine atoms and three fac-S-coordinated and one O-coordinated DMSO molecules. The interconversion of complexes in solutions was studied by UV/Vis and 1H and 13C NMR spectroscopy. In chloroform and DMSO, complex 2 isomerizes to cis-[OsBr2(dmso-S)4] and (in the light) to 1. The complexes trans-[OsX2(dmso-d6)4], where X = Cl, Br, were isolated from DMSO-d 6 and characterized by the IR spectra.Синтезированы бромодиметилсульфоксидные комплексы осмия(II): trans-[OsBr2(dmso-S)4] (1) взаимодействием K2[OsBr6] с ДМСО в присутствии SnBr2 при 100°С; cis,fac-[OsBr2(dmso-S)3(dmso-O)] (2) термической изомеризацией 1 в растворе ДМСО при 150°С. Координация молекул ДМСО установлена методами ИК- и ЯМР 1 и 13 спектроскопии. РСА показал, что соединение 2 кристаллизуется в моноклинной сингонии, пр. гр. P21/n; a = 8.4711(5), b = 27.7876(15), c = 8.5569(5) A, =115.7110(10)°; Z = 4. Координационный полиэдр осмия представляет собой искаженный октаэдр; окружение осмия составляют два cis-расположенных атома брома, три S-координированные в fac-позиции и одна O-координированная молекулы ДМСО. Методами ЭСП и ЯМР 1 и 13 изучено взаимопревращение комплексов в растворах. В хлороформе и ДМСО комплекс 2 изомеризуется в cis-[OsBr2(dmso-S)4] и (на свету) в 1. Из ДМСО-d6 выделены и охарактеризованы ИК-спектрами комплексы trans-[OsХ2(dmso-d6)4], где Х = Cl, Br

Synthesis and structure of the [OsThio 6]Br3 • H2O complex

A complex of the composition [OsThio 6]Br3 • H2O is synthesized by the reaction of H2OsBr6 with thiourea in a 0.5 M HBr solution. The [OsThio 6]Br3 • H2O complex is characterized using electronic absorption and infrared spectroscopy. The structure of the complex is determined by X-ray diffraction analysis. The crystals are orthorhombic with the unit cell parameters a = 20.510(4) Å, b = 11.186(2) Å, c = 11.892(2) Å, space group Pccn, and Z = 4. The thiourea molecules are coordinated to the osmium atom through the sulfur atom. The osmium atom has an octahedral coordination. The Os-S distances fall in the range 2.39-2.40 Å. The outersphere H2O molecules and Br- anions are involved in hydrogen bonds with the NH2 groups of the thiourea molecules. © Nauka/Interperiodica 2007