title: Langmuir and Langmuir-Blodgett films of hybrid amphiphiles with a polyoxometalate headgroup.
abstract: A hybrid was at first synthesized by a postfunctionalization of an aminomethane trisalkoxo-functionalized Anderson-type polyoxometalate (POM) encapsulated by three tetrabutylammonium ions using a 3,5-bis(tetradecyloxy)benzoic acid by amidation. Then the three TBA(+) counter cations were programmatically replaced by protons (H(+)) following a molecule-to-amphiphile conversion. In this way one hybrid and three POM-containing hybrid amphiphiles (PCHAs) were acquired by adjusting the number (n) of TBA(+) ions and number (3 - n) of H(+) ions (n = 3, 2, 1, and 0). These compounds can be spread onto a water surface to form a Langmuir monolayer film at the air-water interface. Surface pressure-molecular area measurements exhibit the TBA(+) (H(+)) number playing an important role in the forming ability and stability of Langmuir monolayer films. Also, the Langmuir-Blodgett (LB) technique has been used to transfer the monolayer film onto solid supports to fabricate solid multilayer films. It was found that the PCHA with three H(+) ions had the best Langmuir film-forming ability and thus formed stable LB films with a two-dimensional ordered structure. Our findings are instructive in fabricating and using solid films of the amphiphiles with POM headgroups.
authors: Center for Synthetic Soft Materials, Key Laboratory of Functional Polymer Materials of the Ministry of Education and Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China.
authors: Xiao-Le
authors: XL
authors: Wang
authors: Yong-Liang
authors: YL
authors: Wang
authors: Wen-Ke
authors: WK
authors: Miao
authors: Min-Biao
authors: MB
authors: Hu
authors: Jing
authors: J
authors: Tang
authors: Wei
authors: W
authors: Yu
authors: Zhan-Yao
authors: ZY
authors: Hou
authors: Ping
authors: P
authors: Zheng
authors: Wei
authors: W
authors: Wang
mesh_terms: D000388:Air; D046529:Microscopy, Electron, Transmission; D015394:Molecular Structure; D011522:Protons; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*; D014867:Water
chemical_list: D011522:Protons; D000644:Quaternary Ammonium Compounds; D013501:Surface-Active Agents; D017973:Tungsten Compounds; D014867:Water; C009405:tetrabutylammonium