title: Polynuclear Hydroxido-Bridged Complexes of Platinum(IV) with Terminal Nitrato Ligands.
abstract: For the first time the polynuclear hydroxido-bridged platinum(IV) nitrato complexes with nuclearity higher than two were isolated from nitric acid solutions of [Pt(H2O)2(OH)4] and crystallized as supramolecular compounds of macrocyclic cavitands cucurbit[n]uril (CB[n], n = 6,8) and 18-crown-6 ether: [Pt4(μ3-OH)2(μ2-OH)4(NO3)10]·CB[6]·25H2O (I), [Pt6(μ3-OH)4(μ2-OH)6(NO3)12](NO3)2·CB[8]·50H2O (II), and [H3O⊂18-crown-6]2[Pt2(μ2-OH)2(NO3)8][Pt4(μ3-OH)2(μ2-OH)4(NO3)10] (III). The isolation of the compounds in the single crystalline state allows the determination of the structure of the tetranuclear and hexanuclear complexes [Pt4(μ3-OH)2(μ2-OH)4(NO3)10] and [Pt6(μ3-OH)4(μ2-OH)6(NO3)12](2+), which have been previously unknown in the solid state. Stability of Ptx(OH)y cores of the polynuclear nitrato complexes toward alkaline hydrolysis was verified by (195)Pt NMR spectroscopy. Analysis of (195)Pt NMR spectra of the compound III reveals that addition of every Pt(μ-OH)2Pt ring results in ∼260 ppm downfield shift relative to the mononuclear form, which allows the prediction of signal positions for complexes of higher nuclearity.
authors.affiliation: †Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russian Federation.|‡Novosibirsk State University, 630090 Novosibirsk, Russian Federation.
authors.forename: Danila
authors.initials: D
authors.lastname: Vasilchenko
authors.affiliation: ‡Novosibirsk State University, 630090 Novosibirsk, Russian Federation.
authors.forename: Semen
authors.initials: S
authors.lastname: Berdugin
authors.affiliation: †Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russian Federation.
authors.forename: Sergey
authors.initials: S
authors.lastname: Tkachev
authors.affiliation: †Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russian Federation.
authors.forename: Iraida
authors.initials: I
authors.lastname: Baidina
authors.affiliation: §International Tomography Centre, Russian Academy of Sciences, 630090 Novosibirsk, Russian Federation.
authors.forename: Galina
authors.initials: G
authors.lastname: Romanenko
authors.affiliation: †Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russian Federation.
authors.forename: Olga
authors.initials: O
authors.lastname: Gerasko
authors.affiliation: †Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russian Federation.|‡Novosibirsk State University, 630090 Novosibirsk, Russian Federation.
authors.forename: Sergey
authors.initials: S
authors.lastname: Korenev