The pure ligand synthesis using either 2-methylimidazole or 2ethylimidazole has been previously reported with Zn(II), Co(II) and Fe(II), yielding SOD frameworks in the case of the former (the well-known ZIF-8, ZIF-67 and MUV-3); or different polymorphs in the case of the latter, including RHO (MAF-6), ANA (MAF-5) and qtz (MAF-32 and MUV-7) topologies (see Figure and Section S2.1.2). In the case of 2methylbenzimidazole, only the Fe(II) analogue has been previously reported (MUV-6), although the Zn(II) and Co(II) analogues can also be prepared with this solvent-free methodology (see Section S2.1.2).