Liu Yan, Lin Shi-Xin, Niu Ru-Jie, Liu Quan, Zhang Wen-Hua, Young David J
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China.
College of Chemistry and Chemical Engineering, Nantong University Nantong 226019 (P. R. China).
Chempluschem. 2020 May;85(5):832-837. doi: 10.1002/cplu.202000175.
The heterofunctional lactone furo[3,4-b]pyridin-5(7H)-one (L ) undergoes a coordination-induced ring-opening reaction with Zn(NO ) ⋅ 6H O to yield the zwitterionic [Zn(L ') (H O) ] (1, L '=2-(hydroxymethyl)nicotinate) with an uncoordinated carboxylate. The same reaction with Cd(NO ) ⋅ 4H O provides a two-dimensional (2D) network of [Cd(L ') ] (3) with the carboxylates coordinated to cadmium(II) propagating the assembly. The corresponding reactions of Zn(NO ) ⋅ 6H O and Cd(NO ) ⋅ 4H O with 2-(hydroxymethyl)isonicotinic acid (HL ) generated zwitterionic [Zn(L ) (H O) ] (2) and a 2D network [Cd(L ) ] ⋅nDMF (4, DMF=N,N'-dimethylformamide), respectively. Complexes 1-4 are weakly emissive, giving ligand-centered emissions at 409 nm (1), 412/436 nm (2), 404 nm (3), and 412/436 nm (4) in CHCl solutions upon excitation at 330 nm. This work points to the potential of using 'hidden' functionalities widely found in small organic molecules and natural products for the construction of coordination complexes with new functionality and potential applications.
杂功能内酯呋喃并[3,4 - b]吡啶 - 5(7H)-酮（L）与Zn(NO₃)₂·6H₂O发生配位诱导的开环反应，生成两性离子型的[Zn(L')₂(H₂O)₂]（1，L' = 2 - （羟甲基）烟酸酯），其中有一个未配位的羧酸盐。与Cd(NO₃)₂·4H₂O进行相同反应得到二维（2D）网络结构的[Cd(L')₂]（3），羧酸盐与镉（II）配位，促进了组装。Zn(NO₃)₂·6H₂O和Cd(NO₃)₂·4H₂O与2 - （羟甲基）异烟酸（HL）的相应反应分别生成两性离子型的[Zn(L)₂(H₂O)₂]（2）和二维网络结构[Cd(L)₂]·nDMF（4，DMF = N，N'-二甲基甲酰胺）。配合物1 - 4发射较弱的光，在330 nm激发下，在CHCl₃溶液中分别在409 nm（1）、412/436 nm（2）、404 nm（3）和412/436 nm（4）处发出以配体为中心的发射光。这项工作指出了利用在小有机分子和天然产物中广泛存在的“隐藏”功能来构建具有新功能和潜在应用的配位配合物的潜力。
