Commutators of Riesz Transforms Related to Schrodinger Operators

In this work we obtain boundedness on L(p) , for 1 < p < infinity, of commutators T(b)f = bTf - T(bf) where T is any of the Riesz transforms or their conjugates associated to the Schrodinger operator -Delta+V with V satisfying an appropriate reverse Holder inequality. The class where b belongs is larger than the usual BMO. We also obtain a substitute result for p = infinity, under a slightly stronger condition on b.