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Studies on the covalent attachment of dyes onto the layer of silylated graphite oxide and their fluorescence properties

染料在硅烷化氧化石墨层上的共价附着及其荧光性能的研究

基本信息

批准号：
17550179
负责人：
MATSUO Yoshiaki
金额：
$ 2.24万
依托单位：
University of Hyogo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17550179/
关键词：
Graphite oixde emission silylation pyrene aggregation intercalation compounds perfluoroalkyl groups active ester

项目摘要

Graphite oxide was successfully silylated by various silylating reagents. Pyrene chromophores were covalently attached onto the layer of graphite oxides silylated by alkyltrichlorosilanes with various alkyl chain lengths using a dye prepared from the reaction between 1-pyrenecarboxaldehyde and 3-aminopropyltriethoxysilane. The amount of attached pyrene was determined from the absorption of 1-pyrenecarboxaldehyde formed as the result of hydrolysis of the above materials and it reached 0.7 per 8 carbons of graphite oxide unit. The aggregation of pyrene chromophores occurred only when the alkyl chains in the layer of graphite oxide took bilayer orientation. This suggests that pyrene molecules attached on the same graphite oxide layer hardly aggregate. The maximum amount of monomeric pyrene in the layer of graphite oxide reached 0.45 per graphite oxide unit. Pyrene chromophores were also attached by the reaction between 1-pyrenebutannoic acid succimidyl ester and silylated graphite oxide containing amino groups. In this system, the fluorescence became stronger because C=N bonding causing self absorption was excluded. The substitution of alkyl chains by perfluoroalkyl chains with lower vibration energy also resulted in the increase of fluorescence since the radiationless transition from dyes decreased.

氧化石墨成功地被各种硅烷化试剂硅烷化。芘的发色团共价连接到层的氧化石墨硅烷化的烷基三氯硅烷与不同的烷基链长度使用的染料之间的反应制备的1-芘甲醛和3-氨丙基三乙氧基硅烷。由上述材料水解形成的1-芘甲醛的吸收量确定附着的芘的量，其达到每8个氧化石墨单元的碳0.7。只有当氧化石墨层中的烷基链呈双层取向时，芘发色团才发生聚集。这表明附着在同一氧化石墨层上的芘分子几乎不聚集。氧化石墨层中的单体芘的最大量达到0.45个/氧化石墨单元。芘发色团也连接1-芘丁酸琥珀酰亚胺酯和硅烷化的含氨基的氧化石墨之间的反应。在该体系中，由于排除了引起自吸收的C=N键，荧光变得更强。用振动能较低的全氟烷基链取代烷基链也导致了荧光的增加，因为染料的无辐射跃迁减少。