Abstract
A ditopic 18-membered N2O2S2-macrocycle (L) incorporating hard (NO2) and soft (NS2) binding sites in each side was employed and its three complexes (1–3) exhibiting different stoichiometries, geometries, and topologies have been prepared and structurally characterized. First, nickel(II) nitrate hexahydrate reacts with L to give a mononuclear complex [Ni(L)](NO3)2·2H2O (1) in which the metal center locates inside the macrocyclic cavity adopting a hexa-coordinated octahedral geometry shielded by the strongly bound macrocycle from the anion and solvent. While, silver(I) tetrafluoroborate afforded a one-dimensional coordination polymer {[Ag(L)]BF4}n (2) with an L-Ag-L-Ag pattern. In 2, the silver(I) center is penta-coordinate with NO donors from one L and NS2 donors from an adjacent L to form a sandwich-type adopting a distorted trigonal bipyramidal geometry. Mercury(II) chloride yielded a dinuclear complex [Hg2(L)Cl4] (3) in which two mercury(II) ions locate opposite side of L in a chair form. Each mercury(II) center in 3 is penta-coordinate, being bound to one pyridine N atom, two O(S) donors in the compositional disorder, and two chloride ions adopting a distorted square-pyramidal geometry. The comparative NMR studies show the preferential binding affinity of silver(I) over potassium(I) toward L.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
