104.Langmuir and Langmuir–Blodgett Films of Hybrid Amphiphiles with a Polyoxometalate Headgroup
writer：Xiaole Wang,Yongliang Wang,Wenke Miao,Minbiao Hu,Jing Tang,Wei Yu,Zhanyao Hou,Pin Zheng,Wei Wang
keywords：Polyoxometalate,Langmuir–Blodgett Films,Hybrid,Amphiphile
source：期刊
specific source：Langmuir, 2013, 29 (22), pp 6537–6545
Issue time：2013年
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.