Communication: Oligomeric AsN particles have been synthesized as a first step towards forming polymeric (AsN)(x), which is expected to be the arsenic nitride with the most important applications. The synthesis is described and the characterization of the resulting oligomers by X-ray powder diffraction, mass spectrometry and DSC is presented, which leads to the proposed structure of (AsN)(12)(AsCl2)(6)Cl-6 shown in the Figure. [GRAPHICS] the experiment, results for PC are reported, showing, for example, that the phenylene motion is more affected by the strain that the methyl motion.