LANGMUIR-BLODGETT (LB) OF TRANSITION-METAL COMPLEXES SQUARE-PLANAR PLATINUM(II) COMPLEXES

The flat Pt(Thpy)2 complex, where Thpy is 2-(2-thienyl)-2-pyridine, forms a compressible LB film on the surface of pure water when it is mixed with stearic acid. The pressure-area isotherm of a mixture of Pt(Thpy)2/stearic acid shows two plateaus in the solid phase region that corresponds to a horizontal and a vertical orientation of the Pt(Thpy)2 molecules in the LB film on the surface of water. The areas calculated per molecule at the two orientations are (57 +/- 2)angstrom 2 and (25 +/- 1)angstrom 2. The Uv-vis absorption of the LB film of Pt(Thpy)2/stearic acid mixture indicates that the Pt complex molecules disperse homogeneously between the stearic acid molecule in the film. The emission of the multilayer LB film of Pt(Thpy)2/stearic acid shows a maximum at lambda = 566 nm. Solution emission and lifetime decay data are also presented.