Fig. 10. (a) and (b) The formate-terminated inorganic zirconium nodes of UiO-66, in their hydrated Zr6O4(OH)4(OOCH)12, (a) and dehydrated Zr6O6(OOCH)12, (b) form; (c) cluster model of the transition state of the cyclisation from citronellal to isopulegol with two explicit nitro-functionalised BDC linkers; (d) periodic model of UiO-66 comprised of fully coordinated inorganic nodes (brick 1) and defect-containing inorganic nodes (brick 2), with indication of the periodic unit cell. Panels (c) and (d) reproduced from ref. 76 and 216 with permission of Wiley and Elsevier, copyright 2012 and 2015.
