Syntheses, Structural Characterization, and Properties of Ag(I) Complexes from Oxazoline-Based Ligands

The reactions of 2,6-di(2-oxazolyl)pyridine (L-1), 2-[(S)-4-phenyl-2-oxazolyl]quinoline (L-2) and 2-[(S)-4-isopropyl-2-oxazolyl]quinoline (L-3) with silver nitrate yield three new complexes {[Ag-5(L-1)(5)]-(NO3)(5)}(n) (I), [Ag(L-2)(NO3)] (II), and [Ag(L-3)(NO3)(CH3CN)] (III), which have been fully characterized by single-crystal X-ray diffraction (CIF files nos. 1553091, 1553092, and 1559788, respectively), IR spectroscopy, and elemental and thermogravimetric analyses. Complex I shows a helical chain structure and the spiral directions of the chains are opposite, resulting in an achiral meso structure. Both II and III display discrete mononuclear structures. Fluorescence and non-linear optical (NLO) properties of the complexes were investigated.