Silver(I) Complexes Based On Diorganoselenium(Ii) Ligands With Amino Or Hydroxo Functionalities

The diorganoselenide [Me2C(OH)CH2](2)Se (1) was prepared by reacting the in situ obtained Na2Se with 1-chloro-2-methyl-2-propanol. Reactions of 1 and [2-(Me2NCH2)C6H4](2)Se (2) with appropriate silver(I) salts in 1:1 molar ratio resulted in metal complexes of type [Ag(X)Se{CH2C(OH)Me-2}(2) ] [X = OSO2CF3 (OTf) (3), OClO3 (4)] and [Ag(X)Se{C6H4(CH2NMe2)-2}(2)] [X = OSO2CF3 (5), ONO2 (6)], respectively. The ligand 1 and the silver complexes were investigated by appropriate spectroscopic methods, both in solution and in solid state: multinuclear NMR (H-1, C-13, F-19, Se-77), ESI+ mass spectrometry, IR spectroscopy and molar conductivity. The metal complexes behave as 1:1 electrolytes in 10(-3) MeOH solutions, while in solid state the anionic ligands behave as monodentate moieties. Complexes 4 and 5 were investigated by single-crystal X-ray diffraction. The crystal of 4 contains two similar independent molecules, 4a and 4b , for which was observed the migration of one OH hydrogen from ligand 1 to the OClO3 group, thus resulting in [Ag(HClO4)Se{OCCH2Me2}{(OH)CCH2Me2}], where ligand 1 behaves as an O,Se monometallic biconective moiety. In 5 the ligand 2 acts as a N,Se,N monometallic triconective moiety. In both compounds Ag(I) is surrounded by the donor atoms in a trigonal pyramidal coordination geometry. Strong Se -> Ag intermolecular interactions in 4 resulted in 1D coordination polymers built by 4a and 4b molecules, respectively, while in the crystal of 5 no interaction between heavy atoms was observed. Supramolecular networks based on H center dot center dot center dot O contacts are formed in both compounds. (C) 2021 Elsevier B.V. All rights reserved.