Crystal structure, fluorescence, and nanostructuration studies of the first Zn(II) anthracene-based curcuminoid.
In the following article the coordination properties of a recently reported curcuminoid 9Accm (9Accm = 1,7-(di-9-anthracene)-1,6-heptadiene-3,5-dione) with Zn(II) are reported. Preparation, crystal structure, and fluorescence spectroscopic studies of [Zn(II)(9Accm)(2)(py)] (1) are presented, as well as preliminary AFM and confocal microscopy studies on graphite surfaces. Complex 1 is the first crystallographically characterized Zn-curcuminoid in the literature; the intrinsic features of the complex are contrasted with the free ligand, 9Accm, and [Cu(II)(9Accm)(2)(py)] (2), a similar copper system, which has been recently described by us. It is shown that complex 1 exhibits a chelation enhancement of fluorescence (CHEF) and 2 a chelation enhancement of quenching (CHEQ) with respect to the fluorescence response of the free ligand, demonstrating the highly sensitive response of 9Accm versus these two metals. All  studies are supported by density functional theory (DFT) calculations.
Institució Catalana de Recerca i Estudis Avançats & Universitat de Barcelona, Facultat de Química, Martí i Franquès, 1-11, 08028 Barcelona, Spain. nuria.aliaga@icrea.cat
Núria
N
Aliaga-Alcalde
Laura
L
Rodríguez
Marilena
M
Ferbinteanu
Petra
P
Höfer
Thomas
T
Weyhermüller
D000873:Anthracenes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003474:Curcumin / Q000031:analogs & derivatives* / Q000737:chemistry; D006108:Graphite; D049449:Luminescence; D018625:Microscopy, Atomic Force; D018613:Microscopy, Confocal; D015394:Molecular Structure; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D017967:Zinc Compounds / Q000737:chemistry*
C555446:1,7-(di-9-anthracene-1,6-heptadiene-3,5-dione); D000873:Anthracenes; D017967:Zinc Compounds; D006108:Graphite; C034020:anthracene; D003474:Curcumin