CT phantom images of a) [Cu(I4-BDC)(H2O)2]·2H2O (NCP 3a) and b) [Zn(I4-BDC)(EtOH)2]·2EtOH (NCP 5b) dispersed in ethanol, and c) Iodixanol in aqueous solution. From the top, clockwise, the slots have [I]=0, 0.075, 0.150, 0.225, and 0.300 M. d) Xray attenuation as a function of [I] for NCP 3a at 40 kVp, NCP 5b at 50 kVp, and Iodixanol at 40 kVp. Blue: Iodixanol, Red: NCP 3a, Black: 5b. Copyright 2009 Wiley-VCH.