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Bis(triphenylphosphine)platinum chloride is a metal phosphine complex with the formula PtCl 2 [P(C 6 H 5) 3] 2.Cis- and trans isomers are known. The cis isomer is a white crystalline powder, while the trans isomer is yellow. [3]
The Kurnakov test, also known as Kurnakov's reaction, is a chemical test that distinguishes pairs of cis- and trans-isomers of [PtA 2 X 2] (A = NH 3, X = halogen or pseudohalide). Upon treatment with thiourea , the trans -dihalides give less soluble white products, whereas the cis -dihalides give more soluble yellow products.
The cis isomer in this case has a boiling point of 60.3 °C, while the trans isomer has a boiling point of 47.5 °C. [6] In the cis isomer the two polar C–Cl bond dipole moments combine to give an overall molecular dipole, so that there are intermolecular dipole–dipole forces (or Keesom forces), which add to the London dispersion forces and ...
The cis isomer can adopt various conformations, the most stable one being shaped like a ribbon. [1] The most stable conformation of trans-cyclooctene is shaped like the 8-carbon equivalent of the chair conformation of cyclohexane. Longer cycloalkene rings such as the ten-carbon cyclodecene also occur as cis and trans isomers.
cis-1,2-Bis(diphenylphosphino)ethylene (dppv) is an organophosphorus compound with the formula C 2 H 2 (PPh 2) 2 (Ph = C 6 H 5). Both the cis and trans isomers are known, but the cis isomer is of primary interest. Classified as a diphosphine ligand, it is a bidentate ligand in coordination chemistry.
The cis and trans isomers interconvert via the open isomer, which has no bridging ligands between iron atoms. Instead, it is formulated as (η 5-C 5 H 5)(OC) 2 Fe−Fe(CO) 2 (η 5-C 5 H 5) — the metals are held together by an iron–iron bond. At equilibrium, the cis and trans isomers are predominant.
When the metal is square planar, these complexes can exist as cis and trans isomers. The stereochemical possibilities increase when the amino acid ligands are not homochiral. Homoleptic complexes are also known where the amino carboxylate is tridentate amino acids. One such complex is Ni(κ 3-histidinate) 2.
A white solid, it is clasified as a tricarboxylic acid. The two isomers are cis-aconitic acid and trans-aconitic acid. The conjugate base of cis-aconitic acid, cis-aconitate is an intermediate in the isomerization of citrate to isocitrate in the citric acid cycle. It is acted upon by the enzyme aconitase.