Graphene oxide was dispersed in distilled water and mixed with 10% (w/v in g/mL) calcium chloride with continuous stirring for 2 hours at 24, 34 and 55°C to obtain the GO networks coordinated by divalent calcium cations. The complex compounds synthesised were purified by centrifugation and washing twice with distilled water. The same reaction was performed using zinc chloride and strontium chloride to produce similar divalent complex compounds and these coordination compounds of crosslinked GO are hereafter referred to as cGO. The graphene oxide complexation compounds were subsequently vacuum dried at 60°C for 48 hours. This synthetic procedure was assessed by Raman spectroscopy and showed excellent stability and repeatability.