Author:
Boyd Simon,Cabral Nuno M.,Ghiggino Kenneth P.,Grannas Martin J.,McFadyen W. David,Tregloan Peter A.
Abstract
Ligands H2L in which (10-R-anthracen-9-yl)methyl
moieties (R = H, Me, Et) are covalently joined (6-position) to the
5,7-dioxocyclam macrocycle framework have been prepared and their nickel(II)
complexes isolated and characterized. X-Ray crystal structures of
NiIIL (R = H, Me) complexes show that in both
structures the anthracene moieties are folded around towards the mean plane of
the macrocycles; dihedral angles between the mean anthracene and macrocyclic
planes of c. 22˚ are subtended.
1H n.m.r. spectrometry indicates that the folded
conformations are retained in solution. Absorption and fluorescence spectra,
fluorescence quantum yields and lifetimes of the anthracenyl macrocycles are
reported. Absorption spectra of the metal complexes are red-shifted and the
fluorescence is dramatically quenched compared to the metal-free compounds
indicating a strong electronic interaction between the anthracene and the
complexed dioxocyclam macrocycle.
Cited by
6 articles.
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