TY - JOUR
T1 - Series of O,N,O-tridentate ligands zinc(II) complexes with high solid-state photoluminescence quantum yield
AU - Borbone, Fabio
AU - Caruso, Ugo
AU - Causà, Mauro
AU - Fusco, Sandra
AU - Panunzi, Barbara
AU - Roviello, Antonio
AU - Shikler, Rafi
AU - Tuzi, Angela
PY - 2014/1/1
Y1 - 2014/1/1
N2 - Four neutral complexes were synthesized by reaction of tridentate N-salicylidene-N′-aroylhydrazine ligands with zinc(II) acetate and pyridine as a further ligand. The O,N,O-chelating molecules N-4- [octyloxy(phenoxy)]salicylidene-N′-fluorobenzoylhydrazine (L1), N-4-[octyloxy(phenoxy)]salicylidene-N′-(benzothiazolyl)hydrazine (L 2), N-4-[octyloxy(phenoxy)]salicylidene-N′- cyanobenzoylhydrazine (L3), and N-4-[octyloxy(phenoxy)]salicylidene- N′-nitrobenzoylhydrazine (L4) gave dinuclear O-bridged complexes Zn2Li2Py2n (n = 1 or 2 in a special case). The ligands and complexes were characterized by mass spectrometry and 1H NMR, UV/Vis, photoluminescence (PL), and FTIR spectroscopy. The structures of the complexes were solved by single-crystal X-ray analysis. Nematogenic phase behavior was detected for some ligands by thermogravimetric analysis/differential scanning calorimetry (TGA-DSC) and optical observations. The solution and solid-state photoluminescence spectra were recorded and show that the ligands are roughly nonfluorescent, whereas all of the complexes show noteworthy emission in widely different spectral regions. The photoluminescence maxima of the complexes in the solid state are dependent on the acceptor group, and medium-to-high PL quantum yields were recorded for all of the crystalline complexes. Both periodic and molecular DFT calculations were performed to rationalize the absorbance of these complexes at the "one-particle" level.
AB - Four neutral complexes were synthesized by reaction of tridentate N-salicylidene-N′-aroylhydrazine ligands with zinc(II) acetate and pyridine as a further ligand. The O,N,O-chelating molecules N-4- [octyloxy(phenoxy)]salicylidene-N′-fluorobenzoylhydrazine (L1), N-4-[octyloxy(phenoxy)]salicylidene-N′-(benzothiazolyl)hydrazine (L 2), N-4-[octyloxy(phenoxy)]salicylidene-N′- cyanobenzoylhydrazine (L3), and N-4-[octyloxy(phenoxy)]salicylidene- N′-nitrobenzoylhydrazine (L4) gave dinuclear O-bridged complexes Zn2Li2Py2n (n = 1 or 2 in a special case). The ligands and complexes were characterized by mass spectrometry and 1H NMR, UV/Vis, photoluminescence (PL), and FTIR spectroscopy. The structures of the complexes were solved by single-crystal X-ray analysis. Nematogenic phase behavior was detected for some ligands by thermogravimetric analysis/differential scanning calorimetry (TGA-DSC) and optical observations. The solution and solid-state photoluminescence spectra were recorded and show that the ligands are roughly nonfluorescent, whereas all of the complexes show noteworthy emission in widely different spectral regions. The photoluminescence maxima of the complexes in the solid state are dependent on the acceptor group, and medium-to-high PL quantum yields were recorded for all of the crystalline complexes. Both periodic and molecular DFT calculations were performed to rationalize the absorbance of these complexes at the "one-particle" level.
KW - Luminescence
KW - Schiff bases
KW - Tridentate ligands
KW - Zinc
UR - http://www.scopus.com/inward/record.url?scp=84901457565&partnerID=8YFLogxK
U2 - 10.1002/ejic.201400095
DO - 10.1002/ejic.201400095
M3 - Article
AN - SCOPUS:84901457565
SN - 1434-1948
SP - 2695
EP - 2703
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
IS - 16
ER -