Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (03): 237-241.doi: 10.3866/PKU.WHXB20030311

• ARTICLE • Previous Articles     Next Articles

Component-controllable Monolayer of Ru Chelate Complex

Sheng Xia;Fang Kun;Zou Gang;He Ping-Sheng;Lü Wei-Xing   

  1. Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026
  • Received:2002-06-10 Revised:2002-09-20 Published:2003-03-15
  • Contact: He Ping-Sheng

Abstract: In a mixture of Ru(dpphen)32+ and stearic acid (SA),the ratio of Ru(dpphen)32+ :SA=1:2 is the only best one and any excess of Ru(dpphen)32+ or SA is not favorable for the deposition of mixed monolayer and LB films. If variation of the composition of Ru(dpphen)32+ in LB films is needed, some non-functional “surface ions" must be introduced to replace Ru(dpphen)32+ partially. The octadecyltrichlorosilane (OTS) was used to replace Ru(dpphen)32+ successfully. The threshold concentration of Ru(dpphen)32+ in mixing SA-OTS- Ru(dpphen)32+ on pure water and forming Ru(dpphen)32+ controlled LB films was studied. OTS can form crosslinked network monolayer on pure water, on interfusing SA, crosslinked network is destroyed gradually. Increase of concentration of SA, till SA/OTS=3:1,there is no crosslinked network in the monolayer and is favorable for the stable and condensed mixed monolayer and LB films deposition. Ru(dpphen)32+/OTS/SA forms three component mixed monolayer, Ru(dpphen)32+/OTS are surface ions. It is availably to prevent OTS from crosslinking when Ru(dpphen)32+ is mixed. Ru(dpphen)32+/SA and OTS/SA are uniformly mixed. By changing the mixing ratios of Ru(dpphen)32+/SA and OTS/SA, component of Ru(dpphen)32+ will be controlled accurately and can lead the deposition of stable and condensed mixed monolayer for LB films.

Key words: Ru chelate complex, Stearic acid, Octadecyltrichlorosilane, Langmuir-Blodgett film, Monolayer