Uncommon and Emissive {[Au₂(C₃H₆NS₂)₂][Au(C₃H₆NS₂)₂]₂(PF₆)₂} Mixed Au⁺ and Au³⁺ Pseudotetranuclear Crystalline Compound: Synthesis, Structural Characterization, and Optical Properties

Abstract

An uncommon emissive pseudotetranuclear compound, {[Au(CHNS)][Au(CHNS)](PF)}, was synthesized and characterized in terms of its structure and optical properties. The synthesis produced a crystalline compound composed of four gold atoms with two different oxidation states (Au and Au) in the same crystalline structure. The title complex belonged to a triclinic crystalline system involving the centrosymmetric P1̅ space group. X-ray diffractometry and vibrational spectroscopy (infrared, Raman, and SERS) were used for structural characterization of the new crystal. The vibrational spectroscopy techniques supported the X-ray diffraction results and confirmed the presence of bonds including Au-Au and Au-S. Optical characterization performed using UV-vis spectroscopy showed that under ultraviolet excitation, the emissive crystalline complex presented characteristic broad luminescent bands centered at 420 and 670 nm.