Fast and stable vapochromic response induced through nanocrystal formation of a luminescent platinum(II) complex on periodic mesoporous organosilica

Abstract

A hybrid vapoluminescent system exhibiting fast and repeatable response was constructed using periodic mesoporous organosilica with bipyridine moieties (BPy-PMO) and a Pt(II) complex bearing a potentially luminescent 2-phenylpyridinato (ppy) ligand. An intense red luminescence appeared when the Pt(II)-complex immobilised BPy-PMO was exposed to methanol vapour and disappeared on exposure to pyridine vapour. The ON-OFF vapochromic behaviour occurred repeatedly in a methanol/pyridine/heating cycle. Interestingly, a rapid response was achieved in the second cycle and cycles thereafter. Scanning and transmission electron microscopies (SEM/TEM), absorption and emission, and nuclear magnetic resonance spectroscopies, mass spectrometry, and powder X-ray diffraction indicated that methanol vapour induced Si-C cleavage and thus liberated [Pt(ppy)(bpy)]Cl (bpy = 2,2′-bipyridine) from the BPy-PMO framework. Furthermore, the self-assembling properties of the Pt(II) complex resulted in the formation of highly luminescent micro/nanocrystals that were homogeneously dispersed on the porous support. The unique vapoluminescence triggered by the unprecedented protodesilylation on exposure to protic solvent vapour at room temperature is attributable to BPy-PMO being a giant ligand and an effective vapour condenser. Consequently, this hybrid system presents a new strategy for developing sensors using bulk powdery materials.

Novel magnetic propylsulfonic acid-anchored isocyanurate-based periodic mesoporous organosilica (Iron oxide@PMO-ICS-PrSO3H) as a highly efficient and reusable nanoreactor for the sustainable synthesis of imidazopyrimidine derivatives

“…chromatography, solid-phase extraction, etc. Also, these type of materials have been used as suitable supports in a diversity of heterogeneous catalysts for different organic reactions [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] . Indeed, the mesopore channels and high surface area of PMOs make them as an appropriate nanoreactor for releasing of the reactants into mesoporous channels and increases the reaction rate [30][31][32][33][34][35][36][37][38][39][40][41] .…”

Chromic Platinum Complexes Containing Multidentate Ligands

“…The family of bipyridine‐based vapochromic complexes increased in number with the incorporation of other ancillary ligands, such as chlorides, [52] thioglucose, [53] acetylides, [54–56] phenylpyridine, [57] and tartrate [58] . All of these species display a chromic behavior originating from a vapor‐induced molecular rearrangement and the disruption of Pt⋅⋅⋅Pt interactions.…”

Solid-State Structures and Photoluminescence of Lamellar Architectures of Cu(I) and Ag(I) Paddlewheel Clusters with Hydrogen-Bonded Polar Guests

“…The synthesis of photoluminescent transition-metal complexes with d 6 , d 8 , and d 10 configurations has attracted widespread interest recently and has been explored extensively [1][2][3][4][5] due to their flexible ability in tuning the emission energy, intensity, and lifetime by molecular design, crystal engineering, and external stimuli such as temperature [6][7][8], pressure [9][10][11], vapors [12][13][14][15][16][17][18][19][20][21][22], and mechanical forces [23][24][25]. These efforts give rise to the essential basis for their applications to various materials such as lighting sources, organic light-emitting diodes, sensors, displays, and imaging devices.…”