Pt2 II and Pt2 III dimers containing a Pt2(2,2′-bipyridine)2(μ-N,N- dimethyl-guanidinato)2 unit

Ken Sakai, Kazuo Yokokawa, Yoshimi Yokoyama

Research output: Contribution to journalArticle

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Abstract

The syntheses and crystal structures of the title Pt2 II and Pt2 III dimers doubly bridged with N,N-dimethyl-guanidinate ligands, namely bis-(μ-N,N-dimethyl-guanidinato)bis-[(2,2′-bipyridine) platinum(II)](Pt - Pt) bis-(hexa-fluoro-phosphate) acetonitrile disolvate, [Pt2 II(C3H8N3)2(C10H8N2)2](PF6)2·2CH3CN, (I), and guanidinium bis-(μ-N,N-dimethyl-guanidinato)bis-[(2,2′-bipyridine) sulfatoplatinum(III)](Pt - Pt) bis-(hexa-fluoro-phosphate) nitrate hexa-hydrate, (C3H10N3)[PtIII 2(C3H8N3)2(SO4)2(C10H8N2)2]NO3·6H2O, (II), are reported. The oxidation of the Pt2 II dimer into the Pt2 III dimer results in a marked shortening of the Pt - Pt distance from 2.8512 (6) to 2.5656 (4) Å. The change is mainly compensated for by the change in the dihedral angle between the two Pt coordination planes upon oxidation, from 21.9 (2) to 16.9 (3)°. We attribute the relatively strong one-dimensional stack of dimers achieved in the Pt2 II compound in part to the strong PtII⋯C(bpy) associations (bpy is 2,2′-bipyridine) in the crystal structure [Pt⋯C = 3.416 (10) and 3.361 (12) Å].

Original languageEnglish
JournalActa Crystallographica Section C: Crystal Structure Communications
Volume63
Issue number2
DOIs
Publication statusPublished - Jan 31 2007

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Dimers
Phosphates
dimers
Guanidine
Platinum
Nitrates
phosphates
Crystal structure
Ligands
Oxidation
oxidation
crystal structure
Dihedral angle
Hydrates
hydrates
acetonitrile
dihedral angle
nitrates
platinum
ligands

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Structural Biology

Cite this

Pt2 II and Pt2 III dimers containing a Pt2(2,2′-bipyridine)2(μ-N,N- dimethyl-guanidinato)2 unit. / Sakai, Ken; Yokokawa, Kazuo; Yokoyama, Yoshimi.

In: Acta Crystallographica Section C: Crystal Structure Communications, Vol. 63, No. 2, 31.01.2007.

Research output: Contribution to journalArticle

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title = "Pt2 II and Pt2 III dimers containing a Pt2(2,2′-bipyridine)2(μ-N,N- dimethyl-guanidinato)2 unit",
abstract = "The syntheses and crystal structures of the title Pt2 II and Pt2 III dimers doubly bridged with N,N-dimethyl-guanidinate ligands, namely bis-(μ-N,N-dimethyl-guanidinato)bis-[(2,2′-bipyridine) platinum(II)](Pt - Pt) bis-(hexa-fluoro-phosphate) acetonitrile disolvate, [Pt2 II(C3H8N3)2(C10H8N2)2](PF6)2·2CH3CN, (I), and guanidinium bis-(μ-N,N-dimethyl-guanidinato)bis-[(2,2′-bipyridine) sulfatoplatinum(III)](Pt - Pt) bis-(hexa-fluoro-phosphate) nitrate hexa-hydrate, (C3H10N3)[PtIII 2(C3H8N3)2(SO4)2(C10H8N2)2]NO3·6H2O, (II), are reported. The oxidation of the Pt2 II dimer into the Pt2 III dimer results in a marked shortening of the Pt - Pt distance from 2.8512 (6) to 2.5656 (4) {\AA}. The change is mainly compensated for by the change in the dihedral angle between the two Pt coordination planes upon oxidation, from 21.9 (2) to 16.9 (3)°. We attribute the relatively strong one-dimensional stack of dimers achieved in the Pt2 II compound in part to the strong PtII⋯C(bpy) associations (bpy is 2,2′-bipyridine) in the crystal structure [Pt⋯C = 3.416 (10) and 3.361 (12) {\AA}].",
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T1 - Pt2 II and Pt2 III dimers containing a Pt2(2,2′-bipyridine)2(μ-N,N- dimethyl-guanidinato)2 unit

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N2 - The syntheses and crystal structures of the title Pt2 II and Pt2 III dimers doubly bridged with N,N-dimethyl-guanidinate ligands, namely bis-(μ-N,N-dimethyl-guanidinato)bis-[(2,2′-bipyridine) platinum(II)](Pt - Pt) bis-(hexa-fluoro-phosphate) acetonitrile disolvate, [Pt2 II(C3H8N3)2(C10H8N2)2](PF6)2·2CH3CN, (I), and guanidinium bis-(μ-N,N-dimethyl-guanidinato)bis-[(2,2′-bipyridine) sulfatoplatinum(III)](Pt - Pt) bis-(hexa-fluoro-phosphate) nitrate hexa-hydrate, (C3H10N3)[PtIII 2(C3H8N3)2(SO4)2(C10H8N2)2]NO3·6H2O, (II), are reported. The oxidation of the Pt2 II dimer into the Pt2 III dimer results in a marked shortening of the Pt - Pt distance from 2.8512 (6) to 2.5656 (4) Å. The change is mainly compensated for by the change in the dihedral angle between the two Pt coordination planes upon oxidation, from 21.9 (2) to 16.9 (3)°. We attribute the relatively strong one-dimensional stack of dimers achieved in the Pt2 II compound in part to the strong PtII⋯C(bpy) associations (bpy is 2,2′-bipyridine) in the crystal structure [Pt⋯C = 3.416 (10) and 3.361 (12) Å].

AB - The syntheses and crystal structures of the title Pt2 II and Pt2 III dimers doubly bridged with N,N-dimethyl-guanidinate ligands, namely bis-(μ-N,N-dimethyl-guanidinato)bis-[(2,2′-bipyridine) platinum(II)](Pt - Pt) bis-(hexa-fluoro-phosphate) acetonitrile disolvate, [Pt2 II(C3H8N3)2(C10H8N2)2](PF6)2·2CH3CN, (I), and guanidinium bis-(μ-N,N-dimethyl-guanidinato)bis-[(2,2′-bipyridine) sulfatoplatinum(III)](Pt - Pt) bis-(hexa-fluoro-phosphate) nitrate hexa-hydrate, (C3H10N3)[PtIII 2(C3H8N3)2(SO4)2(C10H8N2)2]NO3·6H2O, (II), are reported. The oxidation of the Pt2 II dimer into the Pt2 III dimer results in a marked shortening of the Pt - Pt distance from 2.8512 (6) to 2.5656 (4) Å. The change is mainly compensated for by the change in the dihedral angle between the two Pt coordination planes upon oxidation, from 21.9 (2) to 16.9 (3)°. We attribute the relatively strong one-dimensional stack of dimers achieved in the Pt2 II compound in part to the strong PtII⋯C(bpy) associations (bpy is 2,2′-bipyridine) in the crystal structure [Pt⋯C = 3.416 (10) and 3.361 (12) Å].

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