In a large bowl, combine the flour, cocoa, baking powder, baking soda and salt. In a large bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Add eggs, 1 at a time, beating well after each addition. Add buttermilk; mix well. Stir into dry ingredients just until moistened. Fold in chocolate chips and pecans. , Pour into a greased 9x5-in. loaf pan. Bake at 350° until a toothpick inserted in the center comes out clean, 55-60 minutes. Cool for 10 minutes before removing from pan to a wire rack to cool completely.