Zinc complexes of hydrogen bond accepting ester substituted trispyrazolylborates

Hammes, Brian S.; Luo, Xiaohua; Carrano, Mary W.; Carrano, Carl J.

doi:10.1016/s0020-1693(02)01177-5

Cited by 26 publications

(31 citation statements)

References 24 publications

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“…We could not find a structurally characterised dizinc complex with a single unsupported alkoxide bridge in the literature, but there are some related complexes with single hydroxide bridges. [28][29][30][31][32] Their Zn-O bond lengths (1.87-2.00 Å) and Zn-O-Zn angles (132-141°) closely resemble those of 17 and 18. With respect to the L3·Zn units, specifically the displacement of the bridging oxygen off the B···Zn line, complexes 17 and 18 are completely analogous to the other L·Zn-X complexes reported here.…”

Section: Alkoxide Complexesmentioning

confidence: 79%

New Tris(thioimidazolyl)borate Ligands and Some Zinc Complexes Thereof

2005

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In order to improve the encapsulation of metal ions coordinated by tris(thioimidazolyl)borate ligands, four new such ligands with o-substituted phenyl substituents were synthesised as well as ones with p-tolyl and cyclohexyl substituents. In order to provide a basis for their bioinorganic zinc complex chemistry, they were converted to some zinc-halide, -carboxylate, -nitrate, -phenolate and -benzylate complexes. They

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Section: Alkoxide Complexesmentioning

confidence: 79%

New Tris(thioimidazolyl)borate Ligands and Some Zinc Complexes Thereof

2005

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“…We have attached 3-pyridyl substituents to Tp ligands and studied their zinc complex chemistry, [5][6][7] and Ward did the same with 2-pyridyl groups. [8,9] Carrano reported Tp ligands with carboxylic ester and carboxamide substituents and a number of zinc complexes thereof; [10,11] unfortunately this work could not be reproduced by us. [12] In our eyes the most promising approach has been reported recently by Trofimenko and involved pyrrolidinocarbonyl substituents, [13] which have not yet been exploited in zinc complex chemistry.…”

Section: Introductionmentioning

confidence: 99%

New Polar Pyrazolylborate Ligands and Their Basic Zinc Complex Chemistry

et al. 2006

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By refinement of Trofimenko's procedures, four new tris(pyrazolyl)borate (Tp) ligands bearing pyridyl and carboxamide substituents at the 3-positions of the pyrazole rings, were obtained. Two of them were identified by structure determinations of their potassium salts. Their coordinative properties were explored by preparing Tp*Zn-X complexes, with X = Cl, Br, I, NO 3 , OAc, phenolate, thiophenolate and diorganophosphate, including the cationic complexes [Tp*Zn·L] + with L = methanol and pyrazole. From the spectra and structure determinations of these complexes it has become evident

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“…The [HB(pz R,R' ) 3 ]Zn(OH) complexes (R = tBu, Ph, Cum, R' = H, Me, tBu) (Fig. 10a) (Alsfasser et al, 1991;Looney et al, 1993;, including [HB(pz R ) 3 ] -incorporating hydrogen bonding accepting ester substituents, react as functional models according to the carbonic anhydrase mechanism (Looney et al, 1993;Hammes et al, 2002;Bergquist et al, 2003;Lipton et al, 2003;Lipton & Ellis, 2007) and form bicarbonate from CO 2 . Hydrogensulfido, thiolato, phenolato and alcoholato [HB(pz R ) 3 ] -complexes are accessed by substitution reactions with H 2 S, thiols, phenols or alcohols Bergquist et al, 2000;Brand et al, 2001).…”

Section: Zinc Biomimetic Systemsmentioning

confidence: 99%

“…In some examples, the carboxylate complex [HB(pz CO2Et,Me ) 3 ]Zn(H 2 O)(OAc) and the amidate complex [HB(pz Fu,Me ) 3 ]Zn(H 2 O)(NHCOCF 3 ), ester or furyl functionalities form hydrogen bridges to water or an amidate, respectively (Fig. 11c) (Hammes et al, 2002;Maldonado Calvo & Vahrenkamp, 2006). Chelating ligands belonging to the poly(pyrazolyl)borates can be regarded as relatively hard donor ligands having two or three azole nitrogen atoms that can be involved in metal coordination.…”

Section: Zinc Biomimetic Systemsmentioning

confidence: 99%