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1 Introduction Compounds containing the carbodiimide anion [NCN]2− increasingly entered the focus of research interest during the last decades, for example, due to their promising luminescence properties or their potential application in lithium or sodium ion batteries.[1] For these purposes, mostly pseudo-binary or pseudo-ternary compounds containing at least one transition metal cation were scrutinized.

We have encountered various novel compounds by serendipity, due to small oxygen or carbon impurities, during our explorative studies to explore the crystal chemistry of multinary germanium nitrides and nitridogermanates.