New bis(mercaptoimidazolyl)(pyrazolyl)borate ligands and their zinc complex chemistry

Mouhai Shu; Rainer Walz; Biao Wu; Jan Seebacher; Heinrich Vahrenkamp

doi:10.1002/ejic.200300079

New bis(mercaptoimidazolyl)(pyrazolyl)borate ligands and their zinc complex chemistry

Mouhai Shu, Rainer Walz, Biao Wu, Jan Seebacher, Heinrich Vahrenkamp^*

^*Corresponding author for this work

University of Freiburg

Research output: Contribution to journal › Article › peer-review

61 Citations (Scopus)

Abstract

Nine new tripodal NS2 ligands of the bis(mercaptoimidazolyl)(pyrazolyl)borate type with varying 3-R-mercaptoimidazolyl moieties were prepared as their potassium salts. Treatment with zinc salts yielded the complex types L·Zn-Cl, L·Zn-I, L·Zn-ONO₂, L·Zn-OClO₃ and [L·Zn(imidazole)]ClO₄. Attempts at the formation of L·Zn-OH or cationic L·Zn complexes resulted in dismutation and formation of ZnL₂ complexes. Hydrolytic destruction yielded one [OZn₄(thiooimidazolate)₆] complex. The ZnS₂NO coordination which is present in the enzyme-substrate complex of alcohol dehydrogenase could be successfully modelled by an [L·Zn(C₂H₅OH)]⁺ complex. The L·Zn-X complexes showed very low catalytic activity in the dehydrogenation of 2-propanol or the hydrogenation of p-nitrobenzaldehyde. The new compounds were identified by a total of 12 structure determinations.

Original language	English
Pages (from-to)	2502-2511
Number of pages	10
Journal	European Journal of Inorganic Chemistry
Issue number	13
DOIs	https://doi.org/10.1002/ejic.200300079
Publication status	Published - 7 Jul 2003
Externally published	Yes

Keywords

Bioinorganic chemistry
Tripodal ligands
Zinc

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10.1002/ejic.200300079

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abstract = "Nine new tripodal NS2 ligands of the bis(mercaptoimidazolyl)(pyrazolyl)borate type with varying 3-R-mercaptoimidazolyl moieties were prepared as their potassium salts. Treatment with zinc salts yielded the complex types L·Zn-Cl, L·Zn-I, L·Zn-ONO2, L·Zn-OClO3 and [L·Zn(imidazole)]ClO4. Attempts at the formation of L·Zn-OH or cationic L·Zn complexes resulted in dismutation and formation of ZnL2 complexes. Hydrolytic destruction yielded one [OZn4(thiooimidazolate)6] complex. The ZnS2NO coordination which is present in the enzyme-substrate complex of alcohol dehydrogenase could be successfully modelled by an [L·Zn(C2H5OH)]+ complex. The L·Zn-X complexes showed very low catalytic activity in the dehydrogenation of 2-propanol or the hydrogenation of p-nitrobenzaldehyde. The new compounds were identified by a total of 12 structure determinations.",

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author = "Mouhai Shu and Rainer Walz and Biao Wu and Jan Seebacher and Heinrich Vahrenkamp",

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doi = "10.1002/ejic.200300079",

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AU - Shu, Mouhai

AU - Walz, Rainer

AU - Wu, Biao

AU - Seebacher, Jan

AU - Vahrenkamp, Heinrich

PY - 2003/7/7

Y1 - 2003/7/7

N2 - Nine new tripodal NS2 ligands of the bis(mercaptoimidazolyl)(pyrazolyl)borate type with varying 3-R-mercaptoimidazolyl moieties were prepared as their potassium salts. Treatment with zinc salts yielded the complex types L·Zn-Cl, L·Zn-I, L·Zn-ONO2, L·Zn-OClO3 and [L·Zn(imidazole)]ClO4. Attempts at the formation of L·Zn-OH or cationic L·Zn complexes resulted in dismutation and formation of ZnL2 complexes. Hydrolytic destruction yielded one [OZn4(thiooimidazolate)6] complex. The ZnS2NO coordination which is present in the enzyme-substrate complex of alcohol dehydrogenase could be successfully modelled by an [L·Zn(C2H5OH)]+ complex. The L·Zn-X complexes showed very low catalytic activity in the dehydrogenation of 2-propanol or the hydrogenation of p-nitrobenzaldehyde. The new compounds were identified by a total of 12 structure determinations.

AB - Nine new tripodal NS2 ligands of the bis(mercaptoimidazolyl)(pyrazolyl)borate type with varying 3-R-mercaptoimidazolyl moieties were prepared as their potassium salts. Treatment with zinc salts yielded the complex types L·Zn-Cl, L·Zn-I, L·Zn-ONO2, L·Zn-OClO3 and [L·Zn(imidazole)]ClO4. Attempts at the formation of L·Zn-OH or cationic L·Zn complexes resulted in dismutation and formation of ZnL2 complexes. Hydrolytic destruction yielded one [OZn4(thiooimidazolate)6] complex. The ZnS2NO coordination which is present in the enzyme-substrate complex of alcohol dehydrogenase could be successfully modelled by an [L·Zn(C2H5OH)]+ complex. The L·Zn-X complexes showed very low catalytic activity in the dehydrogenation of 2-propanol or the hydrogenation of p-nitrobenzaldehyde. The new compounds were identified by a total of 12 structure determinations.

KW - Bioinorganic chemistry

KW - Tripodal ligands

KW - Zinc

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DO - 10.1002/ejic.200300079

M3 - Article

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SN - 1434-1948

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JO - European Journal of Inorganic Chemistry

JF - European Journal of Inorganic Chemistry

IS - 13

ER -

New bis(mercaptoimidazolyl)(pyrazolyl)borate ligands and their zinc complex chemistry

Abstract

Keywords

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