CHARACTERIZATION OF THE S(BETA-DIIMINO-TETRACYANO-PYRROLIZINIDO)-METAL(II) COMPLEXES INCORPORATED IN POLYMERIC MATRICES

The bis(beta-diimino-tetracyano-pyrrolizinido)-Cu(II) complex (CuL(2)) has been incorporated in polystyrene (0.28% w/w), by evaporating tetr ahydrofuran solutions either at room temperature (a) or at 100 degrees C (b). From IR and UV-vis measurements and optical microscopy on the resulting films (a or b, thickness 50 mu m) it is concluded that CuL(2 ) is present as a concentrated (C approximate to 10(-1) M) THF solutio n in a and as small solid particles (diameter <1 mu m) in b. The diffe rence in colour of the films (dark blue a, light blue b), due to the d ifferent physical state of CuL(2) in the matrix, is expected, and has been preliminarily shown using similar films based on NiL(2), to be us eful for sensing organic vapours in the atmosphere.