trans-Bromohydridobis-(triphenylphosphine)platinum(II)

The title compound, [PtBrH(C18H15P)2], has a square-planar environment around the Pt atom, with the hydride and bromide ligands being exactly collinear with Pt since they all lie on a crystallographic twofold rotation axis, and with mutually trans triphenyl­phosphine ligands with a P-Pt-P bond angle that is slightly bent towards the hydride [P-Pt-P = 170.81 (5)°]. The Pt-H distance (1.610 Å) is in good agreement with those found in structures determined by neutron diffraction

[1,2-Bis(diphenylphosphino)ethane]-diiodidoplatinum(II) dichloromethane disolvate

In the title compound, [PtI2(C26H24P2)]·2CH2Cl2, the PtI2(dppe) [dppe = 1,2-bis­(diphenyl­phosphino)ethane] mol­ecules possess twofold rotation symmetry. The Pt coordination displays a square-planar arrangement, with the sum of the angles around the Pt atom being 360.01 (2)°. The Pt-I distance is 2.6484 (5) Å. In the crystal structure, inter­molecular C-H...I contacts link the PtI2(dppe) mol­ecules into rows along the c axis, with a C...I distance of 3.873 (5) Å

Selective isomerization of 1-alkenes by binary metal carbonyl compounds

An efficient and selective isomerization of 1-alkenes to their corresponding 2-alkenes is achieved by using binary metal carbonyls such as Ru-3(CO)(12) as catalysts. Possible mechanisms are discussed. Substituents on the 1-alkene have a significant effect on the isomerization. (C) 2008 Elsevier Ltd. All rights reserved

Extraction and coordination behavior of diphenyl hydrogen phosphine oxide towards actinides

<p>Extraction behavior of some selected actinides like U(VI), Th(IV), and Am(III) was investigated with three different H-phosphine oxides, <i>viz.</i> diphenyl hydrogen phosphine oxide (DPhPO), dihexyl hydrogen phosphine oxide (DHePO) and diphenyl phosphite (DPP). The H-phosphine oxides exhibited a dual nature towards the extraction of actinides where the ligand not only extracts the metals by cation exchange but also by coordination with the phosphoryl group at lower and higher acidic concentrations, respectively. Among all ligands employed, DPhPO showed highest extraction with actinides with a substituent dependent trend as follows: DPhPO > DHePO > DPP. This trend emphasizes the importance of substituents around the phosphine oxide towards their extraction of actinides. The coordination behavior of DPhPO was studied by investigating its corresponding complexes with Th(NO₃)₄ and UO₂(NO₃)₂. The metal complexes of these actinides were characterized using FT-IR, ¹H and ³¹P NMR spectroscopic techniques. Density Functional Theory (DFT) calculations were also performed to understand the electronic and geometric structure of the ligand and the corresponding metal complexes.</p