Crystallization of Mo–EDTA complex based solids: Molecular insights

Abstract: The paper reports synthesis and structural elucidation of three new 2:1 molybdenum–EDTA complex based solids: [{Na2(H2O)6}{Mo2O6(H2EDTA)}]·2H2O (1), [{Na4(H2O)8}{Mo2O6(EDTA)}] (2) and [(H2TEMED)Mo2O6(H2EDTA)]·H2O (3). Retrosynthesis of the phases crystallized from the system Na2H2EDTA·2H2O−Na2MoO4·H2O or TEMED-MoO3 provides molecular insights by interpreting the crystal packing in terms of the intermolecular interactions between tectons. 1 and 2 are examples of concentration-dependent crystallization. 3 is the first example based on Mo–EDTA with organic as counter cation. In 1 and 2, the Mo–EDTA complex is coordinated through water-bridged sodium hydrates while in 3 the 2:1 complex interacts with organic counter cation through hydrogen bonding. Crystal data: 1, Monoclinic, space group P21 /c, a =8.5086(9)Å, b =11.5536(12)Å, c =13.3844(14)Å, =92.713(2)°, Z =4; 2, Monoclinic, space group P21 /c, a =11.892(8)Å, b =6.587(5)Å, c =17.155(12)Å, =108.794(11)°, Z =4; 3, Monoclinic, space group P2/c, a =14.549(4)Å, b =6.9153(17)Å, c =15.471(4)Å, =112.843(4)°, Z =2. [Copyright &y& Elsevier]