However, the two bands could not be divided into different peaks and were both attributed to the Ag+ of AgCl, which indicated that the peaks of metallic Ag centered at 368.73 and 374.91 eV were not contained in this XPS spectra, which meant that only AgCl crystals existed on the surface of Ag@AgCl core shell nanowires.
While planar NO3– traverses parallel to the Ag Ag bonds of 1 with the N atom residing near the center of this bond (Ag N 3.577(4) Å and Ag N 3.468(4) Å, Figure 1), BF4– ions interact with only one of the Ag centers of the dimeric units in 2 (Ag–F 3.398(4) Å, Figure 2).
In 4, the L3 anion is not coordinated to the Ag(I) center, while the L1 ligands bridge adjacent Ag(I) centers to give 1D Ag–L1 chains.
The off-center appearance of the Ag core in the SiO2 base occurs due to a built-in misorientation between our sample holder and Ag target, leading to an average non-normal incidence in our deposition chamber.
The pyridyl nitrogen of the PyOH ligands linearly coordinates the Ag(I) center, and the aromatic moieties are near planar but display asymmetric interannular torsional angles in the plane orthogonal to the Ag(I) dimer (0.5° and 6.8°).
For 1, bmpb serves as a bidentate ligand and bridges two Ag(I) centers with two nitrogen atoms from different bimethylpyrimidine rings to form a chain structure.
In complex 2, bpsq functions in a hexadentate fashion, in which two sulfur atoms, two nitrogen atoms from quinoxaline ring and two nitrogen atoms from different pyrimidine rings bind to four different Ag(I) centers.
It also acts as a source of Ag nucleation centers and electrons for the reduction of Ag+ ions that allows avoiding the use of special reducing agents and surface activators, which can be incorporated in the Ag deposit, thus resulting in an undesirable noise in SERS spectra.
