Cobalt(III) promoted ligand fusion reactions of thiobarbituric acid and 4,6-diamino-2-thiouracil (or 4-amino-2-thiouracil)

Kazuaki Yamanari, Makiko Kida, Akira Fuyuhiro, Masakazu Kita, Sumio Kaizaki

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Novel cobalt(III) complexes containing three kinds of assembled ligands, L1-L2=dapymt-tbba(2-), tbba-dapymt(1-) and apymt-tbba(1-) (H3tbba=thiobarbituric acid; Hdapymt=4,6-diamino-2-thiouracil; Hapymt=4-amino-2-thiouracil), were prepared from the mixed ligand systems, where L2 indicates the coordinated ligand to the Co(III) ion and L1 is a pendant ligand bonded to L2. These complexes were characterized by UV-Vis absorption spectra and NMR spectroscopy. The crystal structures of [Co(Htbba)(en)2]ClO4·2H2O (2) (en=ethane-1,2-diamine), [Co{dapymt-tbba(2-)}(en)2]ClO4·3H2O (3) and [Co{apymt-tbba(1-)}(en)2](ClO4)Cl·3H 2O (5′) revealed that coordination occurs through the S(1) and N(1) donors of tbba and the latter complexes 3 and 5′ have an assembled ligand; a new bond is formed between the C(5) atom of tbba and the S(2) atom of dapymt or apymt. An intramolecular hydrogen bond between O(1) of tbba and NH of en was found in all crystals. An interesting intermolecular π-π stacking interaction was found in 5′.

Original languageEnglish
Pages (from-to)115-122
Number of pages8
JournalInorganica Chimica Acta
Volume332
Issue number1
DOIs
Publication statusPublished - Apr 17 2002
Externally publishedYes

Fingerprint

Thiouracil
Cobalt
Fusion reactions
cobalt
fusion
Ligands
ligands
acids
Acids
ethylenediamine
Atoms
diamines
Ethane
ethane
Nuclear magnetic resonance spectroscopy
atoms
Absorption spectra
Hydrogen
Hydrogen bonds
Magnetic Resonance Spectroscopy

Keywords

  • 2-Pyrimidinethione, hetero-ligand assembly
  • Cobalt(III) complexes
  • Heterocyclic thione
  • X-ray crystal structures

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Cobalt(III) promoted ligand fusion reactions of thiobarbituric acid and 4,6-diamino-2-thiouracil (or 4-amino-2-thiouracil). / Yamanari, Kazuaki; Kida, Makiko; Fuyuhiro, Akira; Kita, Masakazu; Kaizaki, Sumio.

In: Inorganica Chimica Acta, Vol. 332, No. 1, 17.04.2002, p. 115-122.

Research output: Contribution to journalArticle

Yamanari, Kazuaki ; Kida, Makiko ; Fuyuhiro, Akira ; Kita, Masakazu ; Kaizaki, Sumio. / Cobalt(III) promoted ligand fusion reactions of thiobarbituric acid and 4,6-diamino-2-thiouracil (or 4-amino-2-thiouracil). In: Inorganica Chimica Acta. 2002 ; Vol. 332, No. 1. pp. 115-122.
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AU - Yamanari, Kazuaki

AU - Kida, Makiko

AU - Fuyuhiro, Akira

AU - Kita, Masakazu

AU - Kaizaki, Sumio

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AB - Novel cobalt(III) complexes containing three kinds of assembled ligands, L1-L2=dapymt-tbba(2-), tbba-dapymt(1-) and apymt-tbba(1-) (H3tbba=thiobarbituric acid; Hdapymt=4,6-diamino-2-thiouracil; Hapymt=4-amino-2-thiouracil), were prepared from the mixed ligand systems, where L2 indicates the coordinated ligand to the Co(III) ion and L1 is a pendant ligand bonded to L2. These complexes were characterized by UV-Vis absorption spectra and NMR spectroscopy. The crystal structures of [Co(Htbba)(en)2]ClO4·2H2O (2) (en=ethane-1,2-diamine), [Co{dapymt-tbba(2-)}(en)2]ClO4·3H2O (3) and [Co{apymt-tbba(1-)}(en)2](ClO4)Cl·3H 2O (5′) revealed that coordination occurs through the S(1) and N(1) donors of tbba and the latter complexes 3 and 5′ have an assembled ligand; a new bond is formed between the C(5) atom of tbba and the S(2) atom of dapymt or apymt. An intramolecular hydrogen bond between O(1) of tbba and NH of en was found in all crystals. An interesting intermolecular π-π stacking interaction was found in 5′.

KW - 2-Pyrimidinethione, hetero-ligand assembly

KW - Cobalt(III) complexes

KW - Heterocyclic thione

KW - X-ray crystal structures

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