TY - JOUR
T1 - 2-Thiopheneacetato-based one-dimensional coordination polymer of Tb 3+
T2 - Enhancement of terbium-centered luminescence in the presence of bidentate nitrogen donor ligands
AU - Raphael, Shyni
AU - Reddy, M. L.P.
AU - Cowley, Alan H.
AU - Findlater, Michael
PY - 2008/10
Y1 - 2008/10
N2 - Four new lanthanide(III) complexes of 2-thiopheneacetic acid (HTPAC), [Tb(TPAC)3·H2O]n (1), [Gd(TPAC)3· H2O]n (2), [Tb(TPAC)3(phen)]2 (3) and [Tb(TPAC)3(bath)]2 (4) (phen = 1,10-phenanthroline; bath = bathophenanthroline) have been synthesized and characterized by various spectroscopic techniques. The X-ray structure of 1 reveals that each Tb 3+ ion is connected to two neighboring ions by six thiopheneacetic acid ligands via the carboxylate groups to form an infinite one-dimensional polymer. The unit cell contains only one independent crystallographic site for the Tb ions. The carboxylate groups of the six molecules of the thiopheneacetate ligands are coordinated in both bidentate bridging and tridentate chelate-bridging modes. Each Tb3+ ion is coordinated by nine oxygen atoms in an overall distorted tricapped trigonal-prismatic geometry. Eight of the oxygen atoms are furnished by the carboxylate moieties, and the remaining oxygen atom is provided by the water molecule. The photophysical properties of these complexes in the solid state at room temperature have been investigated. The quantum yields of 3 (4.43 ± 0.44%) and 4 (9.06 ± 0.90%) were found to be significantly enhanced by the presence of the bidentate nitrogen donor ligands in comparison with that of 1 (0.07 ± 0.01%) due to effective energy transfer from the secondary ligands.
AB - Four new lanthanide(III) complexes of 2-thiopheneacetic acid (HTPAC), [Tb(TPAC)3·H2O]n (1), [Gd(TPAC)3· H2O]n (2), [Tb(TPAC)3(phen)]2 (3) and [Tb(TPAC)3(bath)]2 (4) (phen = 1,10-phenanthroline; bath = bathophenanthroline) have been synthesized and characterized by various spectroscopic techniques. The X-ray structure of 1 reveals that each Tb 3+ ion is connected to two neighboring ions by six thiopheneacetic acid ligands via the carboxylate groups to form an infinite one-dimensional polymer. The unit cell contains only one independent crystallographic site for the Tb ions. The carboxylate groups of the six molecules of the thiopheneacetate ligands are coordinated in both bidentate bridging and tridentate chelate-bridging modes. Each Tb3+ ion is coordinated by nine oxygen atoms in an overall distorted tricapped trigonal-prismatic geometry. Eight of the oxygen atoms are furnished by the carboxylate moieties, and the remaining oxygen atom is provided by the water molecule. The photophysical properties of these complexes in the solid state at room temperature have been investigated. The quantum yields of 3 (4.43 ± 0.44%) and 4 (9.06 ± 0.90%) were found to be significantly enhanced by the presence of the bidentate nitrogen donor ligands in comparison with that of 1 (0.07 ± 0.01%) due to effective energy transfer from the secondary ligands.
KW - 1D coordination polymer
KW - 2-Thiopheneacetic acid
KW - Bidentate nitrogen donors
KW - Enhanced terbium luminescence
UR - http://www.scopus.com/inward/record.url?scp=53549100201&partnerID=8YFLogxK
U2 - 10.1002/ejic.200800506
DO - 10.1002/ejic.200800506
M3 - Article
AN - SCOPUS:53549100201
SP - 4387
EP - 4394
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
SN - 1434-1948
IS - 28
ER -