Complex anionic partial structures of the general formula [BeN−] occur in nitridoberyllates Ae[Be2N2] (Ae=Mg, Ca, Sr, Ba). Planar 4.82 nets are present in Ca[Be2N2] and Sr[Be2N2] (see structure; Ca, Sr: gray; Be: purple; N: green), whereas Mg[Be2N2] displays puckered 63 nets connected to form double layers and a peculiar bonding situation for nitrogen.
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Somer et al. (2004) studied this question.
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