“…is also utilized in the extraction and separation industry (Van Aswegen et al, (1991); Steyn et al, (1992Steyn et al, ( , 1997; Otto et al, (1998); Roodt & Steyn, (2000);Brink et al, (2010)). This study forms part of an ongoing research project that investigates the formation of Hf(IV) and Zr(IV) complexes with various bidentate ligands with possible applications in the mentioned industries (Zherikova et al, (2005(Zherikova et al, ( , 2006(Zherikova et al, ( , 2008; Steyn et al, (2008); Viljoen et al, (2008Viljoen et al, ( , 2009aDemakopoulos et al, (1995); Lewis & Fay (1974) and Calderazzo et al (1998).…”