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Synthesis of Cyanate Esters Based on Mono-O-Methylated Bisphenols with Sulfur-Containing Bridges
摘要： We described a synthetic approach to bisphenol-based monocyanate esters based on mono-O-methylation of parental bisphenols followed by cyanation of the residual phenolic hydroxyl. Structures of the synthesized compounds were determined by the application of IR, NMR 1H and 13C spectroscopies, EI and MALDI mass spectrometry, and purity of the final product was controlled by HPLC. We showed that stability of the cyanate esters depends on the nature of the bridging group. Temperature range of thermally initiated cyclotrimerization of synthesized monocyanate ester, as well as reaction enthalpy, was determined by differential scanning calorimetry (DSC).
关键词： cyanate resins,bisphenols,curing,Mitsunobu reaction,aryl cyanates,cyanate esters,thermal analysis
更新于2025-09-23 15:22:29
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Spatially resolved covalent functionalization patterns on graphene
摘要： Spatially resolved functionalization of 2–D materials is highly demanded but very challenging to achieve. The chemical patterning is typically tackled by preventing contact between the reagent and material, with various accompanying challenges. Photochemical transformation on the other hand inherently provides remote high spatiotemporal resolution using the cleanest reagent – a photon. Here, we combine two competing reactions on a graphene substrate to create functionalization patterns on a micrometre scale via the Mitsunobu reaction. The mild reaction conditions allow introduction of covalently dynamic linkages, which can serve as reversible labels for surface- or graphene-enhanced Raman spectroscopy characterization of the patterns prepared. The proposed methodology thus provides a pathway for local introduction of arbitrary functional groups on graphene.
关键词： patterned functionalization,Mitsunobu reaction,photochemistry,graphene,Raman spectroscopy
更新于2025-09-23 15:21:01
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Synthesis of a side-chain hole transporting polymer through Mitsunobu post-functionalization for efficient inverted perovskite solar cells
摘要： An efficient post-functionalization protocol of Mitsunobu reaction between a commercial reactive polymer of poly(4-vinylphenol) (PVP) and 9-(2-hydroxylethyl)-N,N,N,N-tetrakis(4-methoxyphenyl)-9H-carbazole-2,7-diamine) is reported to synthesize a novel side-chain polymer (PVP-CZ) with high density of hole transporting moieties. The polymer PVP-CZ exhibits adequate solvent resistance and excellent film forming ability for the fabrication of inverted perovskite solar cells (PVSCs). The thermal, optical and electrochemical properties of PVP-CZ were investigated in details. The steady-state photoluminescence (PL) and time resolved photoluminescence (TRPL) decay showed excellent hole-extracting ability of dopant-free PVP-CZ from the perovskite layer. As a result, the inverted PVSCs delivered a respectable power conversion efficiency of 17.75% with a high fill factor of 81.07%. These results indicate that synthetic strategy using the post-functionalization of Mitsunobu reaction is a promising protocol to develop novel side-chain hole transporting polymers for highly efficient PVSCs.
关键词： hole transporting material,Mitsunobu reaction,post-functionalization,side-chain polymer,perovskite solar cells
更新于2025-09-23 15:19:57