WANG Dong-Xiao, WANG Peng* and CHENG Jun-Yan*

Cite this article: Chin. J. Struct. Chem. 2021, 40, 301-305  DOI: 10.14102/j.cnki.0254-5861.2011-2843

Publication date: March 15, 2021

Keywords: crystal structure, double Schiff-base ligand, discrete coordination compound, hydrogen bond

ABSTRACT

One novel discrete coordination molecule with Ag^I centers, namely [Ag₃(L)₃(ClO₄)₃]∙3CH₂Cl₂∙6CH₃OH∙1.5H₂O (1), has been synthesized based on the double Schiff-base ligand, 3,6-bis[2-(4-oxide- quinoxaline)-yl]-4,5-diaza-3,5-octadiene (L) and AgClO₄. The obtained Ag(I) compound was fully characterized by infrared spectroscopy, elemental analysis, and single-crystal X-ray diffraction. 1 is of trigonal system space group P-31c with a = 16.320(2), b = 16.320(2), c = 20.108(6) Å, T = 173(2) K, V = 4638.2(16) ų, D_c = 1.645 g/cm³, M_r = 2297.33, Z = 2, F(000) = 2334, μ = 0.970 mm^–1, Goodness-of-fit = 1.109, the final R = 0.0776, wR = 0.1813, R indices (all data) = 0.1196, wR = 0.2011. The compound exhibits a triple-helical [Ag₃L₃]³⁺ crown-like trimer, in which three Ag(I) atoms form an equilateral triangle with the Ag···Ag distance of 4.7 Å. Uncoordinated counterions ClO₄^– and solvent molecules methanol generate the hydrogen-bonded frameworks based on discrete molecular complex building blocks.