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Light-yellow microcrystalline samples of Cu[dca] ([dca] − ≡[N(CN) 2 ] − ≡dicyanamide anion) were obtained by blending an  in-situ  generated aqueous Cu +  brine with stoichiometric amounts of Na[dca] dissolved in water. The crystal structure of Cu[dca] was solved and refined from powder X-ray diffraction (PXRD) data. Cu[dca] crystallizes in the orthorhombic space group  Cmcm  (no. 63) with the lattice parameters of  a =356.28(3),  b =611.10(9) and  c =1525.87(10) pm. The crystal structure contains undulated chains of alternating Cu +  and boomerang-shaped [N≡C–N–C≡N] −  ions with  C  2 v   symmetry running along [100]. It is closely related to that of Ag[dca] crystallizing in space group  Pnma  (no. 62). The vibrational spectra for Cu[dca] and Cu[dca] 2  were recorded exhibiting modes typical for the dicyanamide anion. Comparative DSC/TG measurements were performed for both copper dicyanamides and the cyanide Cu[CN].

About the air- and water-stable copper(I) dicyanamide: synthesis, crystal structure, vibrational spectra and DSC/TG analysis of Cu[N(CN) 2 ]