in potassium bromide IR cell reactor (inert atmosphere); placing MnBr2 in the quartz sublimator potion, degassing; sublimation of MnBr2 onto KBr window as a film by heating at 550°C for 50 min; addn. of PEt3 at its vapor pressure for 10 min at room temp.; evacuation of excess PEt3 at room temp. for 165 min;