The synthesis, structure and magnetic properties of a novel series of layered compound containing interlayer dicarboxylate anions, where the interlayer separation has been tuned from 9.9 to 13.8 Angstrom, are reported. They display collinear anti ferro magnetism (AF) just below the Neel temperature and in small applied fields canted AF below a second transition. At higher fields metamagnetic behavior is observed which exhibits no hysteresis in the collinear state and wide hysteresis, attaining 5.2 Tesla at 2K, below the canting temperature. The phase diagram is also presented.