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Issue 7, 2015
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“3 + 1 = 6 + 2” in Cu(ii) coordination chemistry of 1H-pyrazole aza cryptands

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Abstract

A polyazamacrocycle formed from two tris(2-aminoethyl)amine units connected by 1H-pyrazole units shows unique hexanuclear Cu(II) complexes by combination of two binuclear Cu(II) cryptand complexes through pyrazolate moieties belonging to both cryptands. The formation of these dimeric entities has been proven both in solution by potentiometric studies and mass spectroscopy and in the solid state by X-ray diffraction of crystals of three different batches of formulae [Cu6(H-3L)2(H2O)2](TsO)6·22H2O (2), [Cu6(H-3L)2(NO3)2](NO3)4·2H2O (3) and [Cu6(H-3L)2Cl2]Cl4·(C4H5N3O2)2·14.35H2O (4). The hexanuclear unit in 2 and 4 can be viewed like three magnetically independent binuclear complexes with J = −366(3) cm−1, g = 2.08(1) for 2 and J = −360(3) cm−1, g = 2.07(1) for 4.

Graphical abstract: “3 + 1 = 6 + 2” in Cu(ii) coordination chemistry of 1H-pyrazole aza cryptands

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Supplementary files

Article information


Submitted
27 Nov 2014
Accepted
06 Jan 2015
First published
07 Jan 2015

Dalton Trans., 2015,44, 3378-3383
Article type
Paper
Author version available

“3 + 1 = 6 + 2” in Cu(II) coordination chemistry of 1H-pyrazole aza cryptands

J. Pitarch-Jarque, R. Belda, F. Lloret, J. Ferrando-Soria, P. Navarro, A. Lopera and E. García-España, Dalton Trans., 2015, 44, 3378
DOI: 10.1039/C4DT03650F

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