About alkali metal dicyanamides: syntheses, single-crystal structure determination, DSC/TG and vibrational spectra of KCs[N(CN)(2)](2) and NaRb2[N(CN)(2)](3) center dot H2O

摘要

Transparent colorless crystals of KCs[N(CN)(2)](2) and NaRb2[N(CN)(2)](3) center dot H2O were obtained by blending aqueous solutions of Na[N(CN)(2)] and RbF or KF, respectively. After evaporation of the water, the remaining solid was extracted with absolute ethanol and the solvent was allowed to evaporate at r. t.. KCs[N(CN)(2)](2) crystallizes in the space group C2/c (no. 15) with the cell parameters a = 1382.7(2), b = 998.1(1) and c = 1455.4(2) pm, and beta = 118.085(4) degrees. The structure of NaRb2[N(CN)(2)](3) center dot H2O is exhibiting the space group P6(3)/m (no. 176) with the cell parameters a = 705.98(7) and c = 1462.89(12) pm. Single-crystalline alpha-K[N(CN)(2)] was obtained while attempting to synthesize 'NaK2[N(CN)(2)](3)', corroborating the results of previous X-ray powder diffraction experiments. Vibrational spectra and DSC/TGA analyses complete our results.