Barriendos Irati, Crespo Olga, Gimeno M Concepción
Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza-CSIC, E-50009 Zaragoza, Spain.
Inorg Chem. 2024 Nov 11;63(45):21699-21710. doi: 10.1021/acs.inorgchem.4c02940. Epub 2024 Oct 29.
Silver bis(carbene) complexes featuring ditopic N-heterocyclic carbene (NHC) ligands have been synthesized which enable the assembly of supramolecular architectures via reaction with silver triflate. Through a systematic exploration of crystal structures and emissive properties, this study investigates the impact of the substituents on the NHC ditopic ligands [R-Im-2-Z-py], where R = Me, benzyl (Bz), or 2-naphthylmethyl (NaphCH), and Z = H or Cl in the structural framework and emissive properties observed in the silver bis(carbene) or polynuclear species. Remarkably diverse structural motifs emerge in both of them, predominantly influenced by the choice of R wingtip and second by the Z substituent. Also the emissive quantum yield of the complexes is mostly governed by the selection of the R wingtip and further modulated by the Z substituent. Several of the mono and polynuclear complexes exhibit complex emissive profiles, including the observation of dual emission phenomena. Particularly noteworthy is the complex [Ag(NHC)]]OTf (R = Bz, Z = Cl), which demonstrates an exceptionally intense single blue emission with a remarkable solid-state quantum yield (Φ) of 24%.
已合成了具有双齿 N-杂环卡宾（NHC）配体的双（卡宾）银配合物，其能够通过与三氟甲磺酸银反应组装超分子结构。通过对晶体结构和发光性质的系统探索，本研究考察了取代基对 NHC 双齿配体[R-Im-2-Z-py]的影响，其中 R = 甲基、苄基（Bz）或 2-萘甲基（NaphCH），且 Z = 氢或氯，以及在双（卡宾）银或多核物种中观察到的结构框架和发光性质。在这两者中出现了非常多样的结构 motif，主要受 R 翼尖选择的影响，其次受 Z 取代基的影响。配合物的发光量子产率大多也由 R 翼尖的选择决定，并进一步由 Z 取代基调节。几种单核和多核配合物表现出复杂的发光谱，包括观察到双发射现象。特别值得注意的是配合物[Ag(NHC)]]OTf（R = Bz，Z = Cl），其表现出异常强烈的单一蓝色发射，固态量子产率（Φ）高达 24%。
