PREPARATION, CRYSTAL-STRUCTURE AND THERMAL-BEHAVIOR OF ETHYLENEDIAMMONIUM-VANADATE

Ethylenediammonium vanadate has been synthesized and its structure determined from single-crystal diffractometer data. The thermal degradation to the oxide V//2O//5 has been studied by means of thermoanalytical, mass spectrometric and morphological investigations. (NH//3-CH//2-CH//2-NH//3)**2** plus (VO//2)//2**2** minus has been prepared by dissolving V//2O//5 in an aqueous solution of ethylenediamine. The unit cell is monoclinic, space group P2//1/////c, M equals 129. 9, a equals 5. 533(1) A, b equals 12. 891(5) A, c equals 5. 689(1) A. The structure is made up of infinite (VO//3)** infinity chains running parallel to the c-axis of the unit cell. These chains form layers within the a-c plane. The double protonated ethylenediamine molecules are located between these chains. A hydrogen bond network is observed.