Controlled Fabrication and Optoelectrical Properties of Metallosupramolecular Films Based on Ruthenium(II) Phthalocyanines and 4,4鈥?Bipyridine Covalently Anchored on Inorganic Substrates
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- 作者：Bin Tong ; Huanfang Yang ; Wenjuan Xiong ; Fei Xie ; Jianbing Shi ; Junge Zhi ; Wai Kin Chan ; Yuping Dong
- 刊名：The Journal of Physical Chemistry B
- 出版年：2013
- 出版时间：May 2, 2013
- 年：2013
- 卷：117
- 期：17
- 页码：5338-5344
- 全文大小：402K
- 年卷期：v.117,no.17(May 2, 2013)
- ISSN：1520-5207
文摘
Fully conjugated metallosupramolecular self-assembled multilayer films were controllably fabricated based on bibenzonitril-phthalocyaninato ruthenium(II) (BBPR) and 4,4鈥?bipyridine (BP) via axially coordination interaction between ruthenium ions and the pyridine groups on the modified substrates. The substrates were first functionalized by 4-(pyridine-4-ylethynyl)benzenic diazonium salt (PBD) through photodecomposition of diazonium group under UV irradiation. As a result, the pyridine-containing functional groups were vertically and covalently anchored onto the surface of substrate and got a stable monolayer. Soluble ruthenium phthalocyanine, axially coordinated by labile benzonitrile groups, was used to fabricate the layer-by-layer self-assembled films with BP through ligand-exchanging reaction between benzonitrile and pyridine in each self-assembled cycle. The UV鈥搗is analysis results demonstrated the successful fabrication of bi(4,4鈥?bipyridine)phthalocyaninato ruthenium(II) (BPPR) metallosupramolecular ultrathin films with definite structures on PBD-modified substrate. Under illumination, the BPPR self-assembled multilayer films displayed a quick response to light. The maximum current density reached 120 nA/cm2 at six bilayers. The Eg, HOMO, and LUMO of the six-bilayer were quantitatively measured to be 1.68, 鈭?.29, and 鈭?.61 eV, respectively. This strategy supplies a facile method to get full-conjugated metallosupramolecules and a platform for developing higher performance solar cell from the point of adjusting dye aggregate state structure.