Here we report CrCl 2 (pym), a new 2D layered magnetic coordination polymer consisting of CrCl 2 chains bridged by pym ligands with a structure analogous to that of the other transition metal monopyrimidine chlorides (MCl 2 (pym), M = Mn, Fe, Co, Ni, Cu), the Mn, Co and Cu analogues of which are reported to possess antiferromagnetic coupling without order down to 1.8 K. We first describe its synthesis and structural characterisation using X-ray diffraction, where the presence of a pronounced Jahn-Teller (JT) distortion confirms the presence of Cr 2+ . We then go on to show using comprehensive magnetic characterisation, including bulk magnetisation, heat capacity measurements, powder neutron diffraction