Discrete half-sandwich Ir, Rh-based organometallic molecular boxes: synthesis, characterization, and their properties was written by Han, Ying-Feng;Lin, Yue-Jian;Jin, Guo-Xin. And the article was included in Dalton Transactions in 2011.SDS of cas: 15420-02-7 This article mentions the following:
The treatment of binuclear complexes [Cp*2M2(μ-QA)Cl2] (M = Ir, 2a; M = Rh, 2b) (H2QA = 1,4-dihydroxyanthraquinone) with pyrazine or bifunctional pyridyl-based ligands (4,4′-dipyridine (bpy), E-1,2-bis(4-pyridyl)ethene (bpe), 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (bpo), and 2,5-bis(4-pyridyl)-1,3,4-thiadiazole (bpt)) in the presence of AgOTf (OTf = CF3SO3) in CH3OH, gave the corresponding tetra-nuclear complexes, with a general formula of [Cp*4M4(μ-QA)2(μ-L)2](OTf)4 (M = Ir, 3a–7a; M = Rh, 3b–7b), resp. The mol. structure of [Cp*4Ir4(μ-QA)2(μ-pyrazine)2](OTf)4 (3a) has been determined by single-crystal x-ray anal., revealing that the metal centers were connected by pyrazine and bis-bidentate QA2- ligands to construct a rectangular cavity with the dimension of 7.30 × 8.41 × 6.92 Å. Complexes 3a and 3b were found to exhibit selective trapping of halocarbons properties. In the experiment, the researchers used many compounds, for example, 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7SDS of cas: 15420-02-7).
2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.SDS of cas: 15420-02-7