Preparation and characterization of cobalt(III) complexes containing 1,1,1-tris(dimethylphosphinomethyl)ethane (mmtp), and the crystal structure of [Co(mmtp)2][Co(CN)6] · 2.25H2O

Tadashi Ando, Masakazu Kita, Kazuo Kashiwabara, Junnosuke Fujita, Saeko Kurachi, Shigeru Ohba

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Abstract

Eight new cobalt(III) complexes of the type, [CoX3(mmtp)]n+ (mmtp= 1,1,1-tris(dimethylphosphino-methyl)ethane, X3=(Cl)3, (Br)3, (CN)3, (NH3)3 mmtp, 3-azapentane-1,5-diamine (dien), 1,4,7-triazacyclononane (tacn), and 1,4,7-trithiacyclononane (ttcn)), were prepared and characterized. All of the complexes are stable in the solid state, but the halogeno complexes aquate rapidly in water, and the ammonia complex liberates NH3 slowly in 1 mol dm-3 HCl to give [CoCl2(NH3)(mmtp)]+, other complexes including [Co(mmtp)2]3+ being stable in solution. The crystal structure of [Co(mmtp)2][Co(CN)e] · 2.25H2O was determined by X-ray analysis. Crystal data: orthorhombic, space group Pca21, a=31.579(5), b=10.521(1), c=23.458(3) Å, V=7794(2) Å3, Z=8, R=0.084 for 4196 reflections. The Co-P bond distances are 2.291(9)-2.357(7) Å (av 2.331 Å), which are appreciably longer than those usually found in Co(III)-phosphine complexes. The absorption spectra of the complexes were compared with one another and with those of the related complexes.

Original languageEnglish
Pages (from-to)2748-2755
Number of pages8
JournalBulletin of the Chemical Society of Japan
Volume65
Issue number10
Publication statusPublished - Oct 1 1992
Externally publishedYes

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phosphine
Ethane
Diamines
X ray analysis
Cobalt
Ammonia
Absorption spectra
Crystal structure
Crystals
Water
trithiacyclononane
1,4,7-triazacyclononane

ASJC Scopus subject areas

  • Chemistry(all)

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Preparation and characterization of cobalt(III) complexes containing 1,1,1-tris(dimethylphosphinomethyl)ethane (mmtp), and the crystal structure of [Co(mmtp)2][Co(CN)6] · 2.25H2O. / Ando, Tadashi; Kita, Masakazu; Kashiwabara, Kazuo; Fujita, Junnosuke; Kurachi, Saeko; Ohba, Shigeru.

In: Bulletin of the Chemical Society of Japan, Vol. 65, No. 10, 01.10.1992, p. 2748-2755.

Research output: Contribution to journalArticle

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title = "Preparation and characterization of cobalt(III) complexes containing 1,1,1-tris(dimethylphosphinomethyl)ethane (mmtp), and the crystal structure of [Co(mmtp)2][Co(CN)6] · 2.25H2O",
abstract = "Eight new cobalt(III) complexes of the type, [CoX3(mmtp)]n+ (mmtp= 1,1,1-tris(dimethylphosphino-methyl)ethane, X3=(Cl)3, (Br)3, (CN)3, (NH3)3 mmtp, 3-azapentane-1,5-diamine (dien), 1,4,7-triazacyclononane (tacn), and 1,4,7-trithiacyclononane (ttcn)), were prepared and characterized. All of the complexes are stable in the solid state, but the halogeno complexes aquate rapidly in water, and the ammonia complex liberates NH3 slowly in 1 mol dm-3 HCl to give [CoCl2(NH3)(mmtp)]+, other complexes including [Co(mmtp)2]3+ being stable in solution. The crystal structure of [Co(mmtp)2][Co(CN)e] · 2.25H2O was determined by X-ray analysis. Crystal data: orthorhombic, space group Pca21, a=31.579(5), b=10.521(1), c=23.458(3) {\AA}, V=7794(2) {\AA}3, Z=8, R=0.084 for 4196 reflections. The Co-P bond distances are 2.291(9)-2.357(7) {\AA} (av 2.331 {\AA}), which are appreciably longer than those usually found in Co(III)-phosphine complexes. The absorption spectra of the complexes were compared with one another and with those of the related complexes.",
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T1 - Preparation and characterization of cobalt(III) complexes containing 1,1,1-tris(dimethylphosphinomethyl)ethane (mmtp), and the crystal structure of [Co(mmtp)2][Co(CN)6] · 2.25H2O

AU - Ando, Tadashi

AU - Kita, Masakazu

AU - Kashiwabara, Kazuo

AU - Fujita, Junnosuke

AU - Kurachi, Saeko

AU - Ohba, Shigeru

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N2 - Eight new cobalt(III) complexes of the type, [CoX3(mmtp)]n+ (mmtp= 1,1,1-tris(dimethylphosphino-methyl)ethane, X3=(Cl)3, (Br)3, (CN)3, (NH3)3 mmtp, 3-azapentane-1,5-diamine (dien), 1,4,7-triazacyclononane (tacn), and 1,4,7-trithiacyclononane (ttcn)), were prepared and characterized. All of the complexes are stable in the solid state, but the halogeno complexes aquate rapidly in water, and the ammonia complex liberates NH3 slowly in 1 mol dm-3 HCl to give [CoCl2(NH3)(mmtp)]+, other complexes including [Co(mmtp)2]3+ being stable in solution. The crystal structure of [Co(mmtp)2][Co(CN)e] · 2.25H2O was determined by X-ray analysis. Crystal data: orthorhombic, space group Pca21, a=31.579(5), b=10.521(1), c=23.458(3) Å, V=7794(2) Å3, Z=8, R=0.084 for 4196 reflections. The Co-P bond distances are 2.291(9)-2.357(7) Å (av 2.331 Å), which are appreciably longer than those usually found in Co(III)-phosphine complexes. The absorption spectra of the complexes were compared with one another and with those of the related complexes.

AB - Eight new cobalt(III) complexes of the type, [CoX3(mmtp)]n+ (mmtp= 1,1,1-tris(dimethylphosphino-methyl)ethane, X3=(Cl)3, (Br)3, (CN)3, (NH3)3 mmtp, 3-azapentane-1,5-diamine (dien), 1,4,7-triazacyclononane (tacn), and 1,4,7-trithiacyclononane (ttcn)), were prepared and characterized. All of the complexes are stable in the solid state, but the halogeno complexes aquate rapidly in water, and the ammonia complex liberates NH3 slowly in 1 mol dm-3 HCl to give [CoCl2(NH3)(mmtp)]+, other complexes including [Co(mmtp)2]3+ being stable in solution. The crystal structure of [Co(mmtp)2][Co(CN)e] · 2.25H2O was determined by X-ray analysis. Crystal data: orthorhombic, space group Pca21, a=31.579(5), b=10.521(1), c=23.458(3) Å, V=7794(2) Å3, Z=8, R=0.084 for 4196 reflections. The Co-P bond distances are 2.291(9)-2.357(7) Å (av 2.331 Å), which are appreciably longer than those usually found in Co(III)-phosphine complexes. The absorption spectra of the complexes were compared with one another and with those of the related complexes.

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