Photoinduced Isomerization-Driven Structural Transformation Between Decanuclear and Octadecanuclear Gold(I) Sulfido Clusters

Upon photoirradiation, isomerization of the ligands, 1,2-bis­(diphenylphosphino)­ethene (dppee) from the cis to the trans form in polynuclear gold­(I) sulfido clusters, led to the structural transformation of the decagold­(I) cluster to the octadecagold­(I) cluster. Both polynuclear μ₃-sulfido gold­(I) clusters have been fully characterized by NMR, mass spectrometry, elemental analysis, and single crystal X-ray diffraction analysis. The transformation process could be readily detected and monitored by UV–vis absorption, emission, and ³¹P NMR spectroscopy in solution. Supported and driven by Au­(I)···Au­(I) bonding interactions, the nuclearity and symmetry of these clusters were largely different from each other, resulting in completely distinct photophysical features

Covalent and Non-covalent Conjugation of Few-Layered Graphene Oxide and Ruthenium(II) Complex Hybrids and Their Energy Transfer Modulation via Enzymatic Hydrolysis

Pyrene-containing ruthenium­(II) tris-bipyridine complexes have been prepared. These complexes have been non-covalently attached onto the few-layered graphene oxide (<b>GO</b>) sheets through their high binding affinity for flat π-surfaces. Alternatively, the reduced graphene oxide (<b>rGO</b>) sheets have also been covalently functionalized with the ruthenium­(II) tris-bipyridine complex. The prepared conjugates have been characterized by transmission electron microscopy (TEM), energy-dispersive X-ray analysis (EDX), X-ray diffraction (XRD), atomic force microscopy (AFM), Raman spectroscopy, thermogravimetric analysis (TGA), and UV–visible absorption spectroscopy. The energy transfer properties of the resulted conjugates between the graphene and transition metal complexes have been studied via esterase hydrolysis. The energy transfer efficiencies were found to vary with the separation between the donor and the acceptor units

Triindole-Tris-Alkynyl-Bridged Trinuclear Gold(I) Complexes for Cooperative Supramolecular Self-Assembly and Small-Molecule Solution-Processable Resistive Memories

A novel class of luminescent trinuclear alkynylgold­(I) complexes with <i>N</i>-alkyl substituted triindole ligands has been synthesized and characterized. They are found to exhibit rich photophysical and electrochemical properties. The complexes have been demonstrated to display interesting supramolecular assembly with spherical nanostructures in aqueous THF solution through a cooperative growth mechanism. The self-assembly process is shown to be mediated by the π–π stacking interactions and hydrophobic–hydrophobic interactions of the triindole moieties upon solvent modulation. These gold­(I) complexes have been employed as active materials in the fabrication of solution-processable resistive memory devices, showing promising binary memory performances with low switching threshold voltages of ca. 1.5 V, high ON/OFF current ratio of up to 10⁵, long retention time of over 10⁴ s, and excellent stability. The present work opens up a new avenue for the future design of versatile organogold­(I) complexes that could serve as multifunctional materials

Photochromic Thienylpyridine–Bis(alkynyl)borane Complexes: Toward Readily Tunable Fluorescence Dyes and Photoswitchable Materials

A series of diarylethene-containing N^∧C chelated thienylpyridine–bis(alkynyl)borane complexes has been designed and synthesized. Their photophysical and photochromic properties have been investigated and presented. The characteristic low-energy absorption band of their closed forms could be readily tuned from the visible range to the near-infrared region

Photochromic Thienylpyridine–Bis(alkynyl)borane Complexes: Toward Readily Tunable Fluorescence Dyes and Photoswitchable Materials

A series of diarylethene-containing N^∧C chelated thienylpyridine–bis(alkynyl)borane complexes has been designed and synthesized. Their photophysical and photochromic properties have been investigated and presented. The characteristic low-energy absorption band of their closed forms could be readily tuned from the visible range to the near-infrared region

Photochromic Thienylpyridine–Bis(alkynyl)borane Complexes: Toward Readily Tunable Fluorescence Dyes and Photoswitchable Materials

A series of diarylethene-containing N^∧C chelated thienylpyridine–bis(alkynyl)borane complexes has been designed and synthesized. Their photophysical and photochromic properties have been investigated and presented. The characteristic low-energy absorption band of their closed forms could be readily tuned from the visible range to the near-infrared region

Addition Reaction-Induced Cluster-to-Cluster Transformation: Controlled Self-Assembly of Luminescent Polynuclear Gold(I) μ₃‑Sulfido Clusters

Unprecedented addition reaction-induced gold­(I) cluster-to-cluster transformation has been observed in the present work. Reaction of the chlorogold­(I) precursor, [vdpp­(AuCl)₂] (vdpp = vinylidenebis­(diphenylphosphine)) containing the diphosphine with unsaturated CC bond, with H₂S resulted in a series of polynuclear gold­(I) μ₃-sulfido clusters bearing Au­(I)···Au­(I) interactions; the identities of which have been fully characterized by NMR, electrospray-ionization mass spectrometry, elemental analysis, and single crystal X-ray diffraction analysis. Diverse research methods, including UV–vis absorption, ¹H NMR, and ³¹P NMR spectroscopy, were employed to detect and monitor the transformation and assembly processes. Supported by single crystal structures, the existence of Au­(I)···Au­(I) bonding interactions sustains the diverse array of sophisticated polynuclear cluster structures and endues them with rich luminescence features

Addition Reaction-Induced Cluster-to-Cluster Transformation: Controlled Self-Assembly of Luminescent Polynuclear Gold(I) μ₃‑Sulfido Clusters

Unprecedented addition reaction-induced gold­(I) cluster-to-cluster transformation has been observed in the present work. Reaction of the chlorogold­(I) precursor, [vdpp­(AuCl)₂] (vdpp = vinylidenebis­(diphenylphosphine)) containing the diphosphine with unsaturated CC bond, with H₂S resulted in a series of polynuclear gold­(I) μ₃-sulfido clusters bearing Au­(I)···Au­(I) interactions; the identities of which have been fully characterized by NMR, electrospray-ionization mass spectrometry, elemental analysis, and single crystal X-ray diffraction analysis. Diverse research methods, including UV–vis absorption, ¹H NMR, and ³¹P NMR spectroscopy, were employed to detect and monitor the transformation and assembly processes. Supported by single crystal structures, the existence of Au­(I)···Au­(I) bonding interactions sustains the diverse array of sophisticated polynuclear cluster structures and endues them with rich luminescence features

Organic Memory Devices Based on a Bis-Cyclometalated Alkynylgold(III) Complex

A bis-cyclometalated alkynylgold­(III) complex, [Au­(^<i>t</i>BuC^N^C^<i>t</i>Bu)­(CC–C₆H₄N­(C₆H₅)₂-<i>p</i>)] (^<i>t</i>BuHC^N^CH^<i>t</i>Bu = 2,6-bis­(4-<i>tert</i>-butylphenyl)­pyridine), has been synthesized and characterized. The complex was found to exhibit rich photophysical and electrochemical properties. More interestingly, the complex has been employed in the fabrication of organic memory devices. The as-fabricated memory devices exhibited good performances with low operating voltage, high ON/OFF ratio, long retention time, and good stability

Luminescent Metallogels of Bis-Cyclometalated Alkynylgold(III) Complexes

A series of luminescent bis-cyclometalated alkynylgold­(III) complexes have been synthesized and characterized. Some of the complexes have been demonstrated to exhibit gelation properties driven by π–π stacking and hydrophobic–hydrophobic interactions. The gelation properties have been investigated in detail through variable-temperature UV–vis absorption and emission studies, and the morphology of the gels has also been characterized by scanning electron microscopy and transmission electron microscopy