Alkinylverbindungen von Übergangsmetallen, XXIX. Alkinyl[1,2‐bis(diphenylphosphino)äthan]‐Komplexe des Platins(II)

Abstract

Durch Umsetzung von cis‐[PtCl2(dpe)] mit Alkaliacetyliden in flüssigem Ammoniak bzw.flüssigem Methylamin werden nichtionische, einkernige Verbindungen des Typs cis‐[Pt(CC̊)2(dpe)] (dpe = (C6H5)2P[CH2]2P(C6H5)2; R = H, CH3, C6H5) dargestellt. Eine analoge Reaktion mit dem zweiwertigen Anion des o‐Diäthinylbenzols hingegen führt zu einem koordinationspolymeren cis‐[Pt(CC)2C6H4(dpe)]n. Die Anwendung eines Acetylidüberschusses führt zu polymeren Komplexen des Typs [K2Pt(CC̊)4(dpe)]n.

Vibrational Spectroscopic Investigation of Rigid-Rod Platinum σ-Acetylide Polymers Containing Variable Acetylenic Microstructures

“…The extent of π-conjugation along the chain should be reflected in the C⋮C stretching frequencies. Values reported here are well within the range observed for a broad selection of monomeric, − dimeric, and polymeric 5,21,22 complexes of nickel, palladium, and platinum. In a series of related monomeric ruthenium σ-acetylide complexes, the IR frequencies of the ν C ⋮ C bands are related to the observed acetylenic bond lengths.…”

“…In both scenarios, the local symmetry is D 2 h . Complexes which are effectively monomeric and dimeric units of these types have been synthesized and characterized. − The D 2 h point group is centrosymmetric, either centered on platinum or on the center of the n -acetylenic chain. The same treatment applies to compounds III − V , regardless of whether the aromatic ring is fixed in the plane of the Pt(L) 2 R 2 unit or perpendicular to it.…”

Synthesis and characterisation of new platinum–acetylide complexes containing diimine ligands

“…The compounds also all show the two ν(C᎐ ᎐ ᎐ C) bands in their IR spectrum expected for a cis-bis(acetylide) complex, although they differ from similar phosphine complexes in that the more intense of the two bands is the lower energy and that they are at a slightly higher frequency. 15 The UV/visible spectra of compounds 1-5 in the 250-1000 nm region have been recorded (Table 2). All except 2 show similar spectra consisting of two major bands (ε ≈ 10 4 dm 3 mol Ϫ1 cm Ϫ1 ), one at 380 to 400, and one at 280 to 290 nm.…”