The above compounds are the 23 binary metal thiocyanates with reported crystal structures. Nearly all stable (and some radioactive) metals have been reported to form complexes with thiocyanate, and it is likely stable binary metal thiocyanates can also be formed for nearly all metals too. Indeed, 13 further metallic elements have been reported to form binary thiocyanates, leaving only 24 non-radioactive metallic elements with no reports at all (Fig. ). The 37 binary metal thiocyanates without structures are likely challenging to synthesize in part due to the need to simultaneously bond both ends of the thiocyanate with their different chemistries, and the propensity to form stable solvates rather than extended frameworks. Below I briefly outline the missing 37 binary metal thiocyanates, and where their synthesis and compositions has been reported, the current state of knowledge. The lack of full characterization for many of these compounds means that these should be treated with caution. Even in materials without complete characterization it is notable that there are currently very few reports of variable oxidation states in metal thiocyanates, even though it is likely that multiple oxidation states of some binaries can be prepared (particularly of transition metal thiocyanates).