A Supramolecular Polymer Network of Graphene Quantum Dots,Angewandte Chemie International Edition

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A Supramolecular Polymer Network of Graphene Quantum Dots
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2018-03-23 , DOI: 10.1002/anie.201713299
Yuichiro Uemura ₁ , Kairi Yamato ₁ , Ryo Sekiya ₁ , Takeharu Haino ₁

Affiliation

Graphene quantum dot (GQD)–organic hybrid compounds (GQD‐2 b–e) were prepared by introducing 3,4,5‐tri(hexadecyloxy)benzyl groups (C16) and linear chains terminated with a 2‐ureido‐4‐[1H]‐pyrimidinone (UPy) moiety onto the periphery of GQD‐1. GQD‐2 b–e formed supramolecular assemblies through hydrogen bonding between the UPy units. GPC analysis showed that GQDs with high loadings of the UPy group formed larger assemblies, and this trend was confirmed by DOSY and viscosity measurements. AFM images showed the polymeric network structures of GQD‐2 e on mica with flat structures (ca. 1.1 nm in height), but no such structures were observed in GQD‐2 a, which only carries the C16 group. GQD‐2 c and GQD‐2 d formed organogels in n‐decanol, and the gelation properties can be altered by replacing the alkyl chains in the UPy group with ethylene glycol chains (GQD‐3). GQD can thus be used as a platform for supramolecular polymers and organogelators by suitable chemical functionalization.

中文翻译：

石墨烯量子点的超分子聚合物网络

石墨烯量子点（GQD）-有机杂化化合物（GQD- 2 b - e）通过引入3,4,5-三（十六烷氧基）苄基（C16）和以2-脲基-4-[[ 1H]-嘧啶酮（UPy）部分位于GQD- 1的外围。GQD- 2 b – e通过UPy单元之间的氢键形成超分子组装体。GPC分析表明，UPy基团的高负载GQD形成了较大的组装，这一趋势已通过DOSY和粘度测量得到了证实。AFM图像显示GQD- 2 e在云母上的聚合物网络结构具有平坦结构（高度约1.1 nm），但在GQD- 2 a中未观察到此类结构，仅包含C16组。GQD- 2 c和GQD- 2 d在正癸醇中形成有机凝胶，可以通过用乙二醇链（GQD- 3）取代UPy基团的烷基链来改变凝胶性质。因此，GQD可以通过适当的化学官能化用作超分子聚合物和有机胶凝剂的平台。

更新日期：2018-03-23

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