Abstract
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.
Original language | English |
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Pages (from-to) | 240-249 |
Number of pages | 10 |
Journal | Inorganica Chimica Acta |
Volume | 414 |
DOIs | |
State | Published - Apr 1 2014 |
Externally published | Yes |
Funding
The authors gratefully acknowledge the National Science Foundation for their generous support ( NSF -CAREER grant to R.E.S., CHE-0846680 ). Z.A also gratefully acknowledges NSF support ( CHE-0959406 ) and the NOAA Educational Partnership Program award number NA06OAR4810187 to NCAT State University as well as support from the donors of the Petroleum Research Fund (ACS-PRF).
Funders | Funder number |
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ACS-PRF | |
National Science Foundation | CHE-0846680, CHE-0959406 |
National Oceanic and Atmospheric Administration | NA06OAR4810187 |
American Chemical Society Petroleum Research Fund |
Keywords
- Dicyanoaurate
- Energy transfer
- Lanthanide
- Photoluminescence
- Single-crystal X-ray diffraction
- Terpyridine