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100 g, 771.6 mmol NiCl2 was dissolved in a mixture of 300 mL methanol and 50 mL trimethyl orthoformate and stirred under reflux overnight. After the reaction, unreacted NiCl2 was removed by filtration, and 80% of the solution was removed under reduced pressure to obtain a green gel. This gel was dissolved in a minimal amount of methanol, and 300 mL DME was added. The solution was refluxed and stirred overnight. The yellow powder precipitate of [NiCl2(DME)] was separated by filtration through a conduit. The powder was washed with pentane and dried under a nitrogen stream. Orange powder ethylene glycol dimethyl ether nickel bromide was given, yield: 135.0 g, 80%. The synthetic route is shown in Figure 2.

Figure: Synthetic Route of NICKEL(II) BROMIDE ETHYLENE GLYCOL DIMETHYL ETHER COMPLEX