CO2 Fixation by Cu2+ and Zn2+ complexes of a terpyridinophane aza receptor. Crystal structures of Cu2+ complexes, pH-metric, spectroscopic, and electrochemical studies

Inorganic Chemistry
Begoña VerdejoAntonio Doménech

Abstract

The synthesis of the terpyridinophane-type polyamine 2,6,9,12,16-pentaaza[17]-(5,5' ')-cyclo-(2,2':6',2' ')-terpyridinophane heptahydrobromide tetrahydrate (L.7HBr.4H2O) is described. L presents six protonation constants with values in the range 9.21-3.27 logarithmic units. L interacts with Cu2+ and Zn2+ forming in both cases, neutral, protonated, and hydroxylated mono- and binuclear complexes whose constants have been calculated by potentiometry in 0.15 M NaClO4 at 298.1 K. The crystal structures of the compounds [Cu(HL-carb)(H2O)](ClO4)3.2H2O (1) and [Cu2(H2L)(CO3)]2(ClO4)8.9H2O (2) have been solved by X-ray diffraction. In 1, the metal center presents square pyramidal geometry. The base of the pyramid is formed by the three nitrogen atoms of pyridine and one oxygen atom of a CO2 group which is forming a carbamate bond with the central nitrogen atom of the polyamine chain. The axial position is occupied by a water molecule. In 2, one Cu2+ is bound by the three pyridine nitrogens and the other one by the three central nitrogen atoms of the polyamine chain. The square planar coordination geometry is completed by a carbonate group taken up from the atmosphere that behaves as a bridging mu,mu'-ligand between the two centers. The ...Continue Reading

References

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Feb 19, 2002·Chemical Reviews·W. Wallace ClelandGeorge H. Lorimer
Apr 22, 2004·Journal of the American Chemical Society·Enrique García-EspañaBegoña Verdejo

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Citations

Jan 16, 2010·Science·Raja AngamuthuElisabeth Bouwman
Mar 15, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Yi-Hsueh HoJwu-Ting Chen
Nov 20, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Amedeo SantoroMalcolm A Halcrow
Dec 6, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Carla BazzicalupiBarbara Valtancoli
May 12, 2007·Chemistry, an Asian Journal·Jia-Mei ChenTong-Bu Lu
Oct 18, 2007·Dalton Transactions : an International Journal of Inorganic Chemistry·Begoña VerdejoJulio Latorre
Jun 30, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Prakash KanooC N R Rao
Apr 23, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Di SunLan-Sun Zheng
Aug 31, 2012·Chemical Communications : Chem Comm·Ana M García-DeibeJesús Sanmartín-Matalobos
Apr 12, 2019·The Science of the Total Environment·Linda PasteroAlessandro Pavese
Jul 18, 2014·Organic Letters·Qi-Qiang WangKristin Bowman-James

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