TY - JOUR
T1 - Synthesis, structures, and photoluminescence properties of lanthanide dicyanoaurates containing dimeric aurophilic interactions
AU - White, Frankie
AU - Pham, Lam N.
AU - Xiang, Kang Rui
AU - Thomas, Rylee
AU - Vogel, Paul
AU - Crawford, Carlos
AU - Assefa, Zerihun
AU - Sykora, Richard E.
PY - 2014/4/1
Y1 - 2014/4/1
N2 - The synthesis of a series of lanthanide dicyanoaurates containing the ancillary ligand 2,2′:6′,2″-terpyridine (terpy) have been carried out by reaction of Ln3+ nitrate salts with terpy and potassium dicyanoaurate. The resultant compounds, [Ln(C15H 11N3)(H2O)(NO3)2Au(CN) 2] (Ln = Eu, Tb, Dy, Ho, Er, Yb), form an isostructural series as established by single-crystal X-ray diffraction studies. These studies reveal the existence of two important non-covalent interactions in these compounds. Dimeric aurophilic interactions and terpyridine π-stacking are both present with distances of ∼3.5 Å for each. Photoluminescence measurements illustrate that the Eu3+ and Tb3+ compounds display enhanced Ln-based emission due to intramolecular energy transfer from the coordinated terpy ligands. Additionally, a [Au(CN)2-] 2 dimeric excimer produces a broad, green emission band in this class of compounds, albeit reduced in intensity in several of the compounds where a reasonable energy match exists with Ln3+ excitation bands.
AB - The synthesis of a series of lanthanide dicyanoaurates containing the ancillary ligand 2,2′:6′,2″-terpyridine (terpy) have been carried out by reaction of Ln3+ nitrate salts with terpy and potassium dicyanoaurate. The resultant compounds, [Ln(C15H 11N3)(H2O)(NO3)2Au(CN) 2] (Ln = Eu, Tb, Dy, Ho, Er, Yb), form an isostructural series as established by single-crystal X-ray diffraction studies. These studies reveal the existence of two important non-covalent interactions in these compounds. Dimeric aurophilic interactions and terpyridine π-stacking are both present with distances of ∼3.5 Å for each. Photoluminescence measurements illustrate that the Eu3+ and Tb3+ compounds display enhanced Ln-based emission due to intramolecular energy transfer from the coordinated terpy ligands. Additionally, a [Au(CN)2-] 2 dimeric excimer produces a broad, green emission band in this class of compounds, albeit reduced in intensity in several of the compounds where a reasonable energy match exists with Ln3+ excitation bands.
KW - Dicyanoaurate
KW - Energy transfer
KW - Lanthanide
KW - Photoluminescence
KW - Single-crystal X-ray diffraction
KW - Terpyridine
UR - https://www.scopus.com/pages/publications/84896540584
U2 - 10.1016/j.ica.2014.02.012
DO - 10.1016/j.ica.2014.02.012
M3 - Article
SN - 0020-1693
VL - 414
SP - 240
EP - 249
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
ER -