Synthesis, structures, and photoluminescence properties of lanthanide dicyanoaurates containing dimeric aurophilic interactions

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• 作者：Frankie White^a ; ^{fdw701@jagmail.southalabama.edu" class="auth_mail} ; Lam N. Pham^a ; ^{lnp901@jagmail.southalabama.edu" class="auth_mail} ; Kang Rui Xiang^a ; ^{kx1001@jgamail.southalabama.edu" class="auth_mail} ; Rylee Thomas^a ; ^{ryleebt@uab.edu" class="auth_mail} ; Paul Vogel^a ; ^{pmv401@gmail.com" class="auth_mail} ; Carlos Crawford^b ; ^{clcrawfo@aggies.ncat.edu" class="auth_mail} ; Zerihun Assefa^b ; ^{zassefa@ncat.edu" class="auth_mail} ; Richard E. Sykora^a ; ^{rsykora@southalabama.edu" class="auth_mail}
• 关键词：Lanthanide ; Dicyanoaurate ; Terpyridine ; Single-crystal X-ray diffraction ; Photoluminescence ; Energy transfer
• 刊名：Inorganica Chimica Acta
• 出版年：1 April, 2014
• 年：2014
• 卷：414
• 期：Complete
• 页码：240-249
• 全文大小：1955 K

文摘

The synthesis of a series of lanthanide dicyanoaurates containing the ancillary ligand 2,2鈥?6鈥?2鈥?terpyridine (terpy) have been carried out by reaction of Ln³⁺ nitrate salts with terpy and potassium dicyanoaurate. The resultant compounds, [Ln(C₁₅H₁₁N₃)(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 蟺-stacking are both present with distances of 鈭?.5 脜 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^{鈭?/sup>]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.}