A new one-dimensional platinum system consisting of carboxylate-bridged cis-diammineplatinium dimers

Ken Sakai, Masao Takeshita, Yuko Tanaka, Takuma Ue, Masayuki Yanagisawa, Masaya Kosaka, Taro Tsubomura, Masamichi Ato, Takeo Nakano

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Abstract

With the aim of developing new 1D platinum chain solids having infinite Pt-Pt bonds, several carboxylate-bridged cis-diammineplatinum dimers have been prepared and structurally characterized. For a dimer doubly bridged with acetates, five different salts [Pt2(NH3)4(μ-CH3CO2)2]X2·nH2O (X2, n = (ClO4)2, 2, 1; (NO3)2, 1, 2; (BF4)2, 4, 4; (PF6)2, 2, 4; (SiF6), 4, 5) have been prepared. The crystal structure of 5 has revealed that an infinite dimer chain [Pt2(NH3)4(μ-CH3CO2)2](n)(2n+) can be given as a result of hydrogen bond formation between the ammines and the oxygen atoms of acetates, demonstrating our prediction that the N2O2 coordination sphere may serve as a hydrogen-bonding moiety to assist formation of an infinite dimer chain. An asymmetric dimer bridged by both acetate and hydroxide ligands, [Pt2(NH3)4(μ-CH3CO2)(μ-OH)](SiF6) (6), has also been isolated as a byproduct of 5, and a similar 1D framework, [Pt2(NH3)4(μ- CH3CO2)(μ-OH)](n)(2n+), has been characterized by X-ray diffraction. In addition, some glycolate-bridged analogues of similar frameworks have been synthesized and characterized: [Pt2(NH3)4(μ- CH2(OH)CO2)2](SiF6)·4H2O (7), [Pt2(NH3)4(μ-CH2- (OH)CO2)2](ClO4)2·H2O (8), and [Pt2(NH3)4(μ-CH2(OH)CO2)(μ- OH)](NO3)2 (9). To obtain partially oxidized systems, benzoate derivatives have been selected as bridging ligands. Although a benzoate system gave dark blue solids ascribable to mixed-valence Pt(2.25+) compounds, a crystallographically analyzed complex has turned out to be a double complex involving both a Pt(II) monomer and a dinuclear Pt(II) complex, [Pt2(NH3)4(μ-C6H5CO2)2]2(SiF6) (BF4)2·[cis- Pt(NH3)2(C6H5CO2)2]·3H2O (10). Nevertheless, our final efforts in this work have revealed that a p-hydroxybenzoate system, [Pt(2.25+)2(NH3)4(μ-p-C6H4(OH)CO2)2]2X5·nH2O (X5, n = (SO4)2 25(p-C6H4(OH)CO2)05, 5, 12a; (PF6)2(SO4)(p-C6H4(OH)CO2), 6, 12b; (PF6)2(NO3)2(p-C6H4(OH)CO2), 7, 12c), may be suited to achieve a 1D platinum blue system. The compounds display a blue chromophore at 630 nm ascribable to the Pt(2.25+)4 species. Moreover, the compounds have been judged to be diamagnetic, and therefore the S = 1/2 spins derived from the Pt(2.25+)4 units must be diamagnetically coupled in the solid state, suggesting that the repeating unit should be expressed as [Pt(2.25+)8](n) (n is undetermined).

Original languageEnglish
Pages (from-to)11353-11363
Number of pages11
JournalJournal of the American Chemical Society
Volume120
Issue number44
DOIs
Publication statusPublished - Nov 11 1998

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Platinum
Dimers
Acetates
glycolic acid
Benzoates
Ligands
Hydrogen Bonding
Hydrogen bonds
X-Ray Diffraction
Hydrogen
Salts
Oxygen
Chromophores
Byproducts
Monomers
Crystal structure
Derivatives
X ray diffraction
Atoms
perchlorate

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

A new one-dimensional platinum system consisting of carboxylate-bridged cis-diammineplatinium dimers. / Sakai, Ken; Takeshita, Masao; Tanaka, Yuko; Ue, Takuma; Yanagisawa, Masayuki; Kosaka, Masaya; Tsubomura, Taro; Ato, Masamichi; Nakano, Takeo.

In: Journal of the American Chemical Society, Vol. 120, No. 44, 11.11.1998, p. 11353-11363.

Research output: Contribution to journalArticle

Sakai, K, Takeshita, M, Tanaka, Y, Ue, T, Yanagisawa, M, Kosaka, M, Tsubomura, T, Ato, M & Nakano, T 1998, 'A new one-dimensional platinum system consisting of carboxylate-bridged cis-diammineplatinium dimers', Journal of the American Chemical Society, vol. 120, no. 44, pp. 11353-11363. https://doi.org/10.1021/ja980055p
Sakai, Ken ; Takeshita, Masao ; Tanaka, Yuko ; Ue, Takuma ; Yanagisawa, Masayuki ; Kosaka, Masaya ; Tsubomura, Taro ; Ato, Masamichi ; Nakano, Takeo. / A new one-dimensional platinum system consisting of carboxylate-bridged cis-diammineplatinium dimers. In: Journal of the American Chemical Society. 1998 ; Vol. 120, No. 44. pp. 11353-11363.
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abstract = "With the aim of developing new 1D platinum chain solids having infinite Pt-Pt bonds, several carboxylate-bridged cis-diammineplatinum dimers have been prepared and structurally characterized. For a dimer doubly bridged with acetates, five different salts [Pt2(NH3)4(μ-CH3CO2)2]X2·nH2O (X2, n = (ClO4)2, 2, 1; (NO3)2, 1, 2; (BF4)2, 4, 4; (PF6)2, 2, 4; (SiF6), 4, 5) have been prepared. The crystal structure of 5 has revealed that an infinite dimer chain [Pt2(NH3)4(μ-CH3CO2)2](n)(2n+) can be given as a result of hydrogen bond formation between the ammines and the oxygen atoms of acetates, demonstrating our prediction that the N2O2 coordination sphere may serve as a hydrogen-bonding moiety to assist formation of an infinite dimer chain. An asymmetric dimer bridged by both acetate and hydroxide ligands, [Pt2(NH3)4(μ-CH3CO2)(μ-OH)](SiF6) (6), has also been isolated as a byproduct of 5, and a similar 1D framework, [Pt2(NH3)4(μ- CH3CO2)(μ-OH)](n)(2n+), has been characterized by X-ray diffraction. In addition, some glycolate-bridged analogues of similar frameworks have been synthesized and characterized: [Pt2(NH3)4(μ- CH2(OH)CO2)2](SiF6)·4H2O (7), [Pt2(NH3)4(μ-CH2- (OH)CO2)2](ClO4)2·H2O (8), and [Pt2(NH3)4(μ-CH2(OH)CO2)(μ- OH)](NO3)2 (9). To obtain partially oxidized systems, benzoate derivatives have been selected as bridging ligands. Although a benzoate system gave dark blue solids ascribable to mixed-valence Pt(2.25+) compounds, a crystallographically analyzed complex has turned out to be a double complex involving both a Pt(II) monomer and a dinuclear Pt(II) complex, [Pt2(NH3)4(μ-C6H5CO2)2]2(SiF6) (BF4)2·[cis- Pt(NH3)2(C6H5CO2)2]·3H2O (10). Nevertheless, our final efforts in this work have revealed that a p-hydroxybenzoate system, [Pt(2.25+)2(NH3)4(μ-p-C6H4(OH)CO2)2]2X5·nH2O (X5, n = (SO4)2 25(p-C6H4(OH)CO2)05, 5, 12a; (PF6)2(SO4)(p-C6H4(OH)CO2), 6, 12b; (PF6)2(NO3)2(p-C6H4(OH)CO2), 7, 12c), may be suited to achieve a 1D platinum blue system. The compounds display a blue chromophore at 630 nm ascribable to the Pt(2.25+)4 species. Moreover, the compounds have been judged to be diamagnetic, and therefore the S = 1/2 spins derived from the Pt(2.25+)4 units must be diamagnetically coupled in the solid state, suggesting that the repeating unit should be expressed as [Pt(2.25+)8](n) (n is undetermined).",
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T1 - A new one-dimensional platinum system consisting of carboxylate-bridged cis-diammineplatinium dimers

AU - Sakai, Ken

AU - Takeshita, Masao

AU - Tanaka, Yuko

AU - Ue, Takuma

AU - Yanagisawa, Masayuki

AU - Kosaka, Masaya

AU - Tsubomura, Taro

AU - Ato, Masamichi

AU - Nakano, Takeo

PY - 1998/11/11

Y1 - 1998/11/11

N2 - With the aim of developing new 1D platinum chain solids having infinite Pt-Pt bonds, several carboxylate-bridged cis-diammineplatinum dimers have been prepared and structurally characterized. For a dimer doubly bridged with acetates, five different salts [Pt2(NH3)4(μ-CH3CO2)2]X2·nH2O (X2, n = (ClO4)2, 2, 1; (NO3)2, 1, 2; (BF4)2, 4, 4; (PF6)2, 2, 4; (SiF6), 4, 5) have been prepared. The crystal structure of 5 has revealed that an infinite dimer chain [Pt2(NH3)4(μ-CH3CO2)2](n)(2n+) can be given as a result of hydrogen bond formation between the ammines and the oxygen atoms of acetates, demonstrating our prediction that the N2O2 coordination sphere may serve as a hydrogen-bonding moiety to assist formation of an infinite dimer chain. An asymmetric dimer bridged by both acetate and hydroxide ligands, [Pt2(NH3)4(μ-CH3CO2)(μ-OH)](SiF6) (6), has also been isolated as a byproduct of 5, and a similar 1D framework, [Pt2(NH3)4(μ- CH3CO2)(μ-OH)](n)(2n+), has been characterized by X-ray diffraction. In addition, some glycolate-bridged analogues of similar frameworks have been synthesized and characterized: [Pt2(NH3)4(μ- CH2(OH)CO2)2](SiF6)·4H2O (7), [Pt2(NH3)4(μ-CH2- (OH)CO2)2](ClO4)2·H2O (8), and [Pt2(NH3)4(μ-CH2(OH)CO2)(μ- OH)](NO3)2 (9). To obtain partially oxidized systems, benzoate derivatives have been selected as bridging ligands. Although a benzoate system gave dark blue solids ascribable to mixed-valence Pt(2.25+) compounds, a crystallographically analyzed complex has turned out to be a double complex involving both a Pt(II) monomer and a dinuclear Pt(II) complex, [Pt2(NH3)4(μ-C6H5CO2)2]2(SiF6) (BF4)2·[cis- Pt(NH3)2(C6H5CO2)2]·3H2O (10). Nevertheless, our final efforts in this work have revealed that a p-hydroxybenzoate system, [Pt(2.25+)2(NH3)4(μ-p-C6H4(OH)CO2)2]2X5·nH2O (X5, n = (SO4)2 25(p-C6H4(OH)CO2)05, 5, 12a; (PF6)2(SO4)(p-C6H4(OH)CO2), 6, 12b; (PF6)2(NO3)2(p-C6H4(OH)CO2), 7, 12c), may be suited to achieve a 1D platinum blue system. The compounds display a blue chromophore at 630 nm ascribable to the Pt(2.25+)4 species. Moreover, the compounds have been judged to be diamagnetic, and therefore the S = 1/2 spins derived from the Pt(2.25+)4 units must be diamagnetically coupled in the solid state, suggesting that the repeating unit should be expressed as [Pt(2.25+)8](n) (n is undetermined).

AB - With the aim of developing new 1D platinum chain solids having infinite Pt-Pt bonds, several carboxylate-bridged cis-diammineplatinum dimers have been prepared and structurally characterized. For a dimer doubly bridged with acetates, five different salts [Pt2(NH3)4(μ-CH3CO2)2]X2·nH2O (X2, n = (ClO4)2, 2, 1; (NO3)2, 1, 2; (BF4)2, 4, 4; (PF6)2, 2, 4; (SiF6), 4, 5) have been prepared. The crystal structure of 5 has revealed that an infinite dimer chain [Pt2(NH3)4(μ-CH3CO2)2](n)(2n+) can be given as a result of hydrogen bond formation between the ammines and the oxygen atoms of acetates, demonstrating our prediction that the N2O2 coordination sphere may serve as a hydrogen-bonding moiety to assist formation of an infinite dimer chain. An asymmetric dimer bridged by both acetate and hydroxide ligands, [Pt2(NH3)4(μ-CH3CO2)(μ-OH)](SiF6) (6), has also been isolated as a byproduct of 5, and a similar 1D framework, [Pt2(NH3)4(μ- CH3CO2)(μ-OH)](n)(2n+), has been characterized by X-ray diffraction. In addition, some glycolate-bridged analogues of similar frameworks have been synthesized and characterized: [Pt2(NH3)4(μ- CH2(OH)CO2)2](SiF6)·4H2O (7), [Pt2(NH3)4(μ-CH2- (OH)CO2)2](ClO4)2·H2O (8), and [Pt2(NH3)4(μ-CH2(OH)CO2)(μ- OH)](NO3)2 (9). To obtain partially oxidized systems, benzoate derivatives have been selected as bridging ligands. Although a benzoate system gave dark blue solids ascribable to mixed-valence Pt(2.25+) compounds, a crystallographically analyzed complex has turned out to be a double complex involving both a Pt(II) monomer and a dinuclear Pt(II) complex, [Pt2(NH3)4(μ-C6H5CO2)2]2(SiF6) (BF4)2·[cis- Pt(NH3)2(C6H5CO2)2]·3H2O (10). Nevertheless, our final efforts in this work have revealed that a p-hydroxybenzoate system, [Pt(2.25+)2(NH3)4(μ-p-C6H4(OH)CO2)2]2X5·nH2O (X5, n = (SO4)2 25(p-C6H4(OH)CO2)05, 5, 12a; (PF6)2(SO4)(p-C6H4(OH)CO2), 6, 12b; (PF6)2(NO3)2(p-C6H4(OH)CO2), 7, 12c), may be suited to achieve a 1D platinum blue system. The compounds display a blue chromophore at 630 nm ascribable to the Pt(2.25+)4 species. Moreover, the compounds have been judged to be diamagnetic, and therefore the S = 1/2 spins derived from the Pt(2.25+)4 units must be diamagnetically coupled in the solid state, suggesting that the repeating unit should be expressed as [Pt(2.25+)8](n) (n is undetermined).

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