Bimacrocyclic Effect in Anion Recognition by a Copper(II) Bicyclam Complex
Bimacrocyclic Effect in Anion Recognition by a Copper(II) Bicyclam Complex
复制标题
双环铜络合物对阴离子识别的双大环效应
DOI:
10.1021/acsomega.8b01710
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发表时间:
2018
期刊:
影响因子:
4.1
通讯作者:
Bonizzoni, Marco
中科院分区:
文献类型:
--
作者:
Invernici, Michele;Ciarrocchi, Carlo;Dondi, Daniele;Fabbrizzi, Luigi;Lazzaroni, Simone;Licchelli, Maurizio;Boiocchi, Massimo;Bonizzoni, Marco
The dicopper(II) complex of the bimacrocyclic ligand α,α′-bis(5,7-dimethyl-1,4,8,11-tetraazacyclotetradecan-6-yl)-o-xylene,2, interacts with selected anions in dimethyl sulfoxide solution according to two different modes: (i) halides (Cl–, Br–, and I–) and N3–coordinate the two metal centers at the same time between the two macrocyclic subunits that face each other and (ii) anionic species that do not fit the bridging coordination mode (e.g., NCO–, SCN–, CH3COO–, NO3–, and H2PO4–) interact with copper(II) ions only at the “external” positions or their interaction is too weak to be detected. Occurrence of the bridging interaction is demonstrated by X-ray crystallographic studies performed on the adduct formed by [Cu2(2)]4+with azide and by electron paramagnetic resonance investigation, as the anion coordination between the two copper(II) centers induces spin–spin coupling. Isothermal titration calorimetry experiments performed on [Cu2(2)]4+and, for comparison, on [(5,7-dimethyl-6-benzyl-1,4,8,11-tetraazacyclotetradecane)copper(II)], representing the mononuclear analogue, allowed determination of thermodynamic parameters (logK, ΔH, andTΔS) associated with the considered complex/anion equilibria. Thermodynamic data showed that adducts formed by [Cu2(2)]4+with halides and azide benefit from an extra stability that can be explained on the basis of the anion advantage of simultaneously binding the two metal centers, i.e., in terms of the bimacrocyclic effect.
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DOI:
10.1002/9781119053859.ch8
发表时间:
2016
期刊:
The Journal of Cell Biology
影响因子:
--
作者:
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通讯作者:
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DOI:
--
发表时间:
1993
期刊:
影响因子:
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作者:
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DOI:
--
发表时间:
1998
期刊:
影响因子:
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作者:
M. Lachkar;R. Guilard;A. Atmani;A. Cian;A. Fischer;R. Weiss
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影响因子:
15
作者:
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通讯作者:
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