... DOI: 10.1039/C2DT30153A (Paper) Dalton Trans., 2012 ... ES-MS: m/z: 619.4 {[VOL(OEt)]+H} + . IR (Nujol mulls, cm −1 ): ν(V O), 965 (s, shr). ... solvent volume per unit cell was calculated to be 141.4 Å 3 (8.6% of the cell volume) for H 2 2L and 758.3 Å 3 (8.6% of the cell volume) for 2 ...