Focussing on superexchange gives only a partial picture, as Heisenberg interactions alone will produce collinear order in a non-frustrated magnet. Our preliminary DFT+U with spinorbit coupling calculations were unable to shed significant extra light on the magnitude or directions of the key terms: however, we can produce simple guidelines from the model Hamiltonian, where we abstract away the strongest (Cl -) and weakest interactions (vdW) to leave a 1D metal-ligand-metal chain. The two key interactions along this chain are the single ion anisotropy and the DMI, and this model has been studied extensively for single chain magnets. In this case, as the true behaviour is three-dimensional, we consider only the simplified static case. Both interactions, as they arise from spin-orbit coupling, are expected to be proportional to g-2 2 . The observed structures require the competition between multiple different interactions, both Heisenberg and relatistivistic.