The purpose of this question is mainly to get a better intuition based on examples, so feel free to post any relevant example. Selenide instead of sulfide is also interesting. However, there will also be a practical application if all the following extra requirements are satisfied: One of the su...

Chen and Wang (2009) have reported an $\ce {N-N-N}$ bond angle in the hydrazoic acid molecule of $171.5$ degrees using B3LYP/6-311G** model. The wikipedia page for the molecule also reports a similar bond angle of $171$ degrees. However, this seems to go against predictions by VSEPR theory for th...