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Two isostructural new alkaline earth germanium nitrides, , were obtained as single crystals from constituent elements in molten Na. They both crystallize in space group (No. 59) with a = 4.0007(8), b = 17.954(3), c = 9.089(2) , Z = 2, and a = 4.1620(2), b = 18.841(1), c = 9.6116(5) , Z = 2, for , respectively. Their crystal structure contains features for both Zintl and nitride phases: zigzag anionic chain of , and dumbbell-shaped bent anion of . Counter cations of Sr or Ba wrap these anionic units in a channel-like arrangement. Unlike in other germanium nitrides, bond lengths of both Ge-N arms of the , are same in . |
