Synthesis and characterization of iron complexes based on bis-phosphinite PONOP and bis-phosphite PONOP pincer ligands

(iPrPONOP)Fe(CO)2 and (OEtPONOP)Fe(CO)2 complexes were prepared. IR carbonyl stretching frequencies for (iPrPONOP)Fe(CO)2 were observed at 1824 and 1876 cm−1, while those for (OEtPONOPFe)(CO)2 were found at 1871 and 1927 cm−1. The electronic properties of the bis-phosphinite and bis-phosphite complexes are intermediate between previously reported PNP and PDI iron complexes.