《Tuned Al3+ selectivity and π-extended properties of di-2-picolylamine-substituted quinoline-based tolan》 was published in Tetrahedron Letters in 2020. These research results belong to Ko, Min-Sung; Kurapati, Sathish; Jo, Yunhee; Cho, Beomhee; Cho, Dong-Gyu. Name: Bis(pyridin-2-ylmethyl)amine The article mentions the following:
Di-2-picolylamine (DPA)-substituted quinoline-type tolan was synthesized herein. The electron withdrawing CN substituted tolan (1)(I) exhibited clear Al3+ selectivity, unlike simple DPA-substituted quinoline (2). Addnl., owing to the π-extension to quinoline (2), a red shifted fluorescence band and the shoulder of tolan (1) were observed at 491 and 537 nm, resp., whereas the quinoline (2) fluorescence band was observed at approx. 450 nm. Consequently, Al3+ bound tolan was more red shifted in comparison with other metal ions bound by 2. Fluorescence titration of Al3+ to 1 (20μM) in HEPES buffer (10 mM, pH = 7.4) containing 50% MeOH exhibited a limit of detection of 36 nM. The results came from multiple reactions, including the reaction of Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Name: Bis(pyridin-2-ylmethyl)amine)
Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. As a tridentate ligand this compound provides three nitrogen donors that affords good selectivity for Zn2+ over biologically relevant metals such as Na+, K+, Mg2+ and Ca2+, and leaves coordination sites free for anion binding. Name: Bis(pyridin-2-ylmethyl)amine