Zirconium iv n propoxide

1-propanol ( $99.9$ %, anhydrous) and zirconium(IV) n-propoxide (70 wt% in n-propanol) were purchased from Alfa Aesar (Kandel, Germany). Aluminum(III) iso-propoxide ( $99.99$ %) was ordered from ABCR (Zürich, Switzerland). Ethanol absolute ( $99.5$ %, extra dry) was from ACROS Organics (Geel, Belgium) and 1-butanol ( $99.5$ %) was purchased from TH.GEYER (Renningen, Germany). Icosanoic acid ( $99.0$ %), hydroxypropyl cellulose (99%, M_w = 80000 $\mathrm{g}$ mol⁻¹) and demineralized water (ACS reagent) were obtained from Sigma Aldrich (Munich, Germany).

Zirconium(IV) n-propoxide (Zr[(OC₃H₇)]₄), 70 w/w % in propanol) and yttrium(III) acetate hexahydrate (Y(CH₃COO)₃·6H₂O, purity 99.9%) were purchased from Alfa Aesar GmbH (Karlsruhe, Germany). 2-methoxyethanol (2-ME; 99.3%) and 1-propanol (99.9%) were acquired from Sigma-Aldrich (Zwijndrecht, Netherlands). Ethanol (99.8%) was purchased from Atlas and Assink Chemie bv (Enschede, Netherlands). Nickel(II) nitrate hexahydrate (Ni(NO₃)₂·6H₂O) was acquired from Merck (Darmstadt, Germany), polyvinyl pyrrolidone (PVP, M_w 1,300,000) from Sigma-Aldrich (Zwijndrecht, Netherlands) and citric acid monohydrate (CA; 99.5%) from Alfa Aesar (Karlsruhe, Germany). All chemicals were used as received. A poly(ethylene oxide terephthalate)/poly(butylene terephthalate) (PEOT/PBT) copolymer was purchased from PolyVation BV. It consists of 45 wt % polyethylene oxide terephthalate and 55 wt % of polybutylene terephthalate. Chloroform (≥99%) was acquired from Sigma-Aldrich (Zwijndrecht, Netherlands) and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) from Biosolve (Valkenswaard, Netherlands).