Mono-silylated 2,1,3-benzothiadiazole-based precursors. Molecular scaffolds for obtaining fluorescent organic-inorganic hybrid materials with tailored photophysical properties
作者:Victória G. Isoppo、Fabiano S. Rodembusch、Angélica V. Moro
DOI:10.1016/j.dyepig.2022.110978
日期:2023.2
benzothiadiazole and their application in obtainingorganic-inorganic fluorescent hybrid materials. The mono-silylated compounds were obtained through a Pd-catalyzed Sonogashira coupling reaction with silicon-functionalized alkynes (25–61% yield). One of the silylated products was chosen as a model compound and six additional BTD-containing products were obtained using Suzuki-Miyaura (53–91% yield) and
Routes to Ruthenium−Cobalt Clusters and Dicobalt Complexes with New Alkoxysilyl- or Sulfur-Functionalized Alkynes. X-ray Structures of [NEt<sub>4</sub>][RuCo<sub>3</sub>(CO)<sub>10</sub>{μ<sub>4</sub>-η<sup>2</sup>-HC<sub>2</sub>(CH<sub>2</sub>)<sub>2</sub>OC(O)NH(CH<sub>2</sub>)<sub>3</sub>Si(OEt)<sub>3</sub>}] and [Co<sub>2</sub>(CO)<sub>6</sub>{μ<sub>2</sub>-η<sup>2</sup>-HC<sub>2</sub>CH<sub>2</sub>NHC(O)NH(CH<sub>2</sub>)<sub>3</sub>Si(OEt)<sub>3</sub>}]
Two general approaches are presented and compared to covalently link metal clusters to alkynes terminated with a trialkoxysilyl or a thioether group. They consist in the direct reaction of the functional alkyne with the cluster or in the functionalization of an alkyne already coordinated to the cluster. These are applied to the tetrahedral mixed-metal cluster [NEt4] [RuCo3(CO)(12)] (NEt(4)(.)1). Complexes with the new alkynes HCdropC(CH2)(2)-OC(O)NH(CH2)(3)Si(OEt)(3) (L-1), HCdropCCH(2)NHC(O)NH(CH2)(3)Si(OEt)(3) (L-2), and HCdropCCH(2)-NHC(O)NHC6H4SMe (L-3) have been characterized, and the crystal structures of [NEt4]-[RuCo3(CO)(10)mu(4)-eta(2) -HC2(CH2)(2)OC(O)NH(CH2)(3)Si(OEt)(3)}] (NEt(4)(.)2a) and [Co-2(CO)(6)mu(2)-eta(2)- HC2CH2NHC(O)NH(CH2)(3)Si(OEt)(3)}] (9) have been determined by X-ray diffraction.
Reactions of Diphosphine-Stabilized Tetracobalt Carbonyl Clusters with −Si(OR)<sub>3</sub>-Functionalized Alkynes
Sonogashira conditions, the dinuclear complex [Co2(CO)4(μ-dppm)μ-η2-PhC2H}] (9) was isolated instead. Reaction of 1,4-bis(trimethylsilyl)butadiyne (L4) with [Co4(CO)12] afforded the known complex [Co2(CO)6(μ2-η2-Me3SiC2-)}2] (10) and with 1a yielded the desired product [Co4(CO)8(μ-dppm)(μ4-η2-Me3SiC2C⋮CSiMe3)] (12), in addition to the known complex [Co2(CO)4(μ-dppm)(μ-η2-Me3SiC2C⋮CSiMe3)] (13). Proto-desilylation
2,1,3-Benzothiadiazole-based bis-silylated compounds: Synthesis and use in the preparation of highly fluorescent low-contend organic–inorganic hybrid materials
作者:Victória G. Isoppo、Marieli Oliveira Rodrigues、Fabiano S. Rodembusch、Angélica V. Moro
DOI:10.1016/j.jphotochem.2022.114277
日期:2023.2
charge-transfer mechanism in the excited state. BTD-containing hybridmaterials were obtained through a sol–gel process, for which the dye loading and aging time were studied. Optimal reproducibility of the photophysical results was achieved when the sol–gel reaction was conducted for 10 d at 60 °C. In the solid state, the obtained hybridmaterials exhibited fluorescence emission in the blue-cyan-green regions