Under the assumption that high T c superconductivity is driven by Coulomb interactions in some form, we are motivated to study the screening of this long range interaction and its implications for superconducting symmetry. Essential to our calculations are tight binding bandstructure effects which give rise to structure in the dielectric constant sufficient to produce a d x 2 - y 2 state with moderate coupling constant. Our results suggest that Coulomb interactions, and, therefore, superconductivity, may be more complex than can be deduced from a simple Hubbard model, which is generally associated with pairing in the spin channel .