In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Atropisomerization, C-H Activation, and Dissociative Substitution at Some Biphenyl Platinum(II) Complexes, published in 2004-05-26, which mentions a compound: 12266-72-7, Name is Diiodo(1,5-cyclooctadiene)platinum(II), Molecular C8H12I2Pt, Recommanded Product: 12266-72-7.
The reaction of 2,2′-dilithiumbiphenyl with cis-[PtCl2(SEt2)2] at -10° in Et2O not only leads to the main product [Pt2(μ-SEt2)2(bph)2], containing the planar 2,2′-biphenyl dianion (bph2-), but also forms a new dinuclear Pt(II) compound [Pt2(μ-SEt2)2(Hbph)4], 1a (Hbph- = η1-biphenyl monoanion), in which each metal is in a square-planar environment. NMR spectroscopy and mol. mechanics (MMFF) calculations were used to characterize 1a. Probably the favored conformation for the four Hbph biphenyl groups is αββα. In CHCl3 solution, 1a undergoes atropisomerization to 1b (αβαβ) (kis = 1.03 × 10-4 s-1, at 298 K) that subsequently cyclometalates (kobs = 4.48 × 10-6 s-1, at 298 K) to yield [Pt2(μ-SEt2)2(bph)2] and biphenyl. Both processes, atropisomerization and C-H activation, presumably involve preliminary thioether bridge splitting. The dinuclear complex 1a is a versatile and useful precursor to a variety of mononuclear η1-biphenyl Pt(II) complexes. By reaction with di-Et sulfide, DMSO, or with rigid dinitrogen containing ligands, such as 2,2′-bipyridine or 1,10-phenanthroline, complexes cis-[Pt(Hbph)2(DMSO)2] 3, cis-[Pt(Hbph)2(SEt2)2] 4, [Pt(Hbph)2(bpy)] 5, and [Pt(Hbph)2(phen)] 6 were obtained, resp. The crystal structures of compounds 5 and 6 were determined Only the head-to-tail isomer of these compounds was recognized in the solid state and in solution, where restricted rotation around the Pt-C bond prevents interconversion to the head-to-head form. A detailed kinetic study of ligand (DMSO) exchange and substitution (by 2,2′-bipyridine and 1,10-phenanthroline) was performed on complex 3 in CDCl3 and toluene-d8 by 1H NMR magnetization transfer experiments, and in toluene by UV/visible spectroscopy, resp. The rates of both processes show no dependence on ligand concentration, the rate of ligand substitution being in reasonable agreement with that of ligand exchange at the same temperature The kinetics were characterized by largely pos. entropies of activation. The results are consistent with a dissociative mode of activation analogous to the pattern already found for compounds with a similar [Pt(C,C)(S,S)] set of coordinating ligands. The role of ML3 d8 T-shaped 14-electron species, as elusive reaction intermediates or structurally characterized compounds, is discussed.
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