Base Hydrolysis Kinetics of Cobalt(III) Spiro-Octaamine Dimer

Yakup BARAN

Makale detayları

Base Hydrolysis Kinetics of Cobalt(III) Spiro-Octaamine Dimer

Yazarlar:

Yakup BARAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2002 Vol.26 Issue 5, pp.771-776

Belge Tipi:

Makale

Yayın Tarihi:

4/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000729792

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

The preparation and characterisation of a cobalt (III)  complex of octaaza ligand, 5,  5'-bis(4-amino-2-azabutyl)-1,9-diamino-3,7-diazanonane (octaam) is  described.  The base hydrolysis kinetics of bis cobalt(III) of octaam  has been studied spectrophotometrically by the stopped-flow technique.   A consequent reaction is observed in the base hydrolysis of the  spiro-octaamine with the fast reaction having kOH = 3.55  M-1s-1 and the slower reaction kOH = 0.72  M-1s-1} at 298 K with D H\# = 89 kJ/mol for the  fast stage and D H\#  = 102 kJ/mol for the slow stage (I =  0.4 M NaClO4).  The fast reaction is assigned to the hydrolysis  of the trans diaqua and the slower to further hydrolysis of the  remaining Cl ions.  The reaction appears to proceed predominantly by a  DCB (dissociative conjugate base) mechanism.

 

The preparation and characterisation of a cobalt (III)  complex of octaaza ligand, 5,  5'-bis(4-amino-2-azabutyl)-1,9-diamino-3,7-diazanonane (octaam) is  described.  The base hydrolysis kinetics of bis cobalt(III) of octaam  has been studied spectrophotometrically by the stopped-flow technique.   A consequent reaction is observed in the base hydrolysis of the  spiro-octaamine with the fast reaction having kOH = 3.55  M-1s-1 and the slower reaction kOH = 0.72  M-1s-1} at 298 K with D H\# = 89 kJ/mol for the  fast stage and D H\#  = 102 kJ/mol for the slow stage (I =  0.4 M NaClO4).  The fast reaction is assigned to the hydrolysis  of the trans diaqua and the slower to further hydrolysis of the  remaining Cl ions.  The reaction appears to proceed predominantly by a  DCB (dissociative conjugate base) mechanism.

Makale detayları

Base Hydrolysis Kinetics of Cobalt(III) Spiro-Octaamine Dimer

Yazarlar: Yakup BARAN

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2002 Vol.26 Issue 5, pp.771-776

Belge Tipi: Makale

Yayın Tarihi: 4/2002

Belge Dili: Türkçe

Document ID (Org No.): 2000729792

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Yakup BARAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2002 Vol.26 Issue 5, pp.771-776

Belge Tipi:

Makale

Yayın Tarihi:

4/2002

Belge Dili:

Türkçe

Document ID (Org No.):

2000729792

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527