A three-dimensional structure of vanadium malonate: synthesis, characterization and X-ray structure of [Na2VO(C3H2O4)2(H2O)2]n

A three-dimensional structure [Na2VO(C3H2O4)2(H2O)2]n was synthesized from the aqueous solution of V2O5, malonic acid and HCl. The compound crystallizes in orthorhombic system, space group C2221 with a ¼7.2472(9) A° , b ¼15.9465(2) A° , c ¼10.3672(1) A° , V ¼1198.1(3) A ° 3, Z ¼ 4; and R1 ¼0.0242 for 1027 observed reflections. Single crystal X-ray diffraction reveals that the vanadium atom is coordinated by six oxygen atoms in an octahedral geometry. It is more interesting that one sodium ion is coordinated by two m3-OH2 and six carboxyl oxygen atoms, which exhibits an unusual coordination mode. The malonato-vanadium units are linked up by two sodium ions to an extended network q 2004 Elsevier B.V. All rights reserved.