Room temperature ultrasonic surface modifications of poly(vinylidene fluoride) (PVDF) with germanium phthalocyanine dichloride in the presence of lithium lead to the formation of Ge-C bonds on the PVDF surfaces. Based on the analysis of attenuated total reflection Fourier transform infra-red, X-ray photoelectron spectroscopy (X.p.s.) and ultraviolet-visible (u.v.-vis.) spectra of the PVDF modified surfaces, it is shown that these species are chemically bonded through a central metal atom. This is demonstrated by the appearance of the 613 cm(-1) band due to the Ge-C stretching mode, and a parallel disappearance of the C-F and C-H modes at 764, 1182 and 1209 cm(-1). Although more data are needed to establish mechanistic aspects of these reactions, X.p.s. and u.v.-vis. spectral analyses also indicate a removal of HF groups from the PVDF surface and the formation of C-Ge bonds.