Abstract
Bicarbonate ion reacts with the dinuclear nickel(II) complex containing the taec ligand (taec = N,N′,N″,N′″-tetrakis-(2-aminoethyl) -1,4,8,11-tetraazacyclotetradecane) in buffered aqueous solution to form the μ-η2,η2-carbonate complex with a large effective binding constant for bicarbonate ion, log KB = 4.39 at pH = 7.4. In contrast, the dinuclear nickel(II) complex containing the o-xyl-DMC2 ligand (o-xyl-DMC2 = α,α′- bis(5,7-dimethyl-1,4,8,11-tetraazacyclotetradecan-6-yl)-o-xylene) does not react with bicarbonate or carbonate ion in aqueous solution. In propylene carbonate, the reaction of [Ni2(o-xyl-DMC2)]4+ with bicarbonate proceeds rapidly to form the μ-η1, η1-carbonate complex. The structure of this carbonate complex has been determined by an X-ray diffraction study that confirms the μ-η1,η1-carbonate binding mode. A mononuclear analogue of [Ni2(taec)]4+, [Ni(2,3,2-tetraamine)] 2+ does not form a detectable mononuclear or dinuclear product with bicarbonate ion in aqueous solution, but [NiDMC]2+ (DMC = 5,7-dimethyl-1,4,8,11-tetraazacyclotetradecane) reacts slowly with carbonate ion in aqueous solution to form a 2:1 complex.
| Original language | English |
|---|---|
| Pages (from-to) | 365-373 |
| Number of pages | 9 |
| Journal | Inorganic Chemistry |
| Volume | 44 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jan 24 2005 |
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ASJC Scopus subject areas
- Inorganic Chemistry
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Studies of bicarbonate binding by dinuclear and mononuclear Ni(II) complexes. / Newell, Rachel; Appel, Aaron; DuBois, Daniel L; DuBois, M. Rakowski.
In: Inorganic Chemistry, Vol. 44, No. 2, 24.01.2005, p. 365-373.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Studies of bicarbonate binding by dinuclear and mononuclear Ni(II) complexes
AU - Newell, Rachel
AU - Appel, Aaron
AU - DuBois, Daniel L
AU - DuBois, M. Rakowski
PY - 2005/1/24
Y1 - 2005/1/24
N2 - Bicarbonate ion reacts with the dinuclear nickel(II) complex containing the taec ligand (taec = N,N′,N″,N′″-tetrakis-(2-aminoethyl) -1,4,8,11-tetraazacyclotetradecane) in buffered aqueous solution to form the μ-η2,η2-carbonate complex with a large effective binding constant for bicarbonate ion, log KB = 4.39 at pH = 7.4. In contrast, the dinuclear nickel(II) complex containing the o-xyl-DMC2 ligand (o-xyl-DMC2 = α,α′- bis(5,7-dimethyl-1,4,8,11-tetraazacyclotetradecan-6-yl)-o-xylene) does not react with bicarbonate or carbonate ion in aqueous solution. In propylene carbonate, the reaction of [Ni2(o-xyl-DMC2)]4+ with bicarbonate proceeds rapidly to form the μ-η1, η1-carbonate complex. The structure of this carbonate complex has been determined by an X-ray diffraction study that confirms the μ-η1,η1-carbonate binding mode. A mononuclear analogue of [Ni2(taec)]4+, [Ni(2,3,2-tetraamine)] 2+ does not form a detectable mononuclear or dinuclear product with bicarbonate ion in aqueous solution, but [NiDMC]2+ (DMC = 5,7-dimethyl-1,4,8,11-tetraazacyclotetradecane) reacts slowly with carbonate ion in aqueous solution to form a 2:1 complex.
AB - Bicarbonate ion reacts with the dinuclear nickel(II) complex containing the taec ligand (taec = N,N′,N″,N′″-tetrakis-(2-aminoethyl) -1,4,8,11-tetraazacyclotetradecane) in buffered aqueous solution to form the μ-η2,η2-carbonate complex with a large effective binding constant for bicarbonate ion, log KB = 4.39 at pH = 7.4. In contrast, the dinuclear nickel(II) complex containing the o-xyl-DMC2 ligand (o-xyl-DMC2 = α,α′- bis(5,7-dimethyl-1,4,8,11-tetraazacyclotetradecan-6-yl)-o-xylene) does not react with bicarbonate or carbonate ion in aqueous solution. In propylene carbonate, the reaction of [Ni2(o-xyl-DMC2)]4+ with bicarbonate proceeds rapidly to form the μ-η1, η1-carbonate complex. The structure of this carbonate complex has been determined by an X-ray diffraction study that confirms the μ-η1,η1-carbonate binding mode. A mononuclear analogue of [Ni2(taec)]4+, [Ni(2,3,2-tetraamine)] 2+ does not form a detectable mononuclear or dinuclear product with bicarbonate ion in aqueous solution, but [NiDMC]2+ (DMC = 5,7-dimethyl-1,4,8,11-tetraazacyclotetradecane) reacts slowly with carbonate ion in aqueous solution to form a 2:1 complex.
UR - http://www.scopus.com/inward/record.url?scp=12344337119&partnerID=8YFLogxK
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U2 - 10.1021/ic049202c
DO - 10.1021/ic049202c
M3 - Article
C2 - 15651883
AN - SCOPUS:12344337119
VL - 44
SP - 365
EP - 373
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 2
ER -