Probing the steric and electronic characteristics of a new bis-pyrrolide pincer ligand. 2014

Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
Department of Chemistry, Indiana University , 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States.

A new pincer ligand is synthesized to be dianionic, with the potential to be redox active. It has pyrrrole rings attached to both ortho sites of a pyridine, as the linking element. This H2L can be doubly deprotonated and then used to replace two chloride ligands in MCl2(NCPh)2, to form LM(NCPh) for M = Pd, Pt. The acid form H2L reacts with ZnEt2 with elimination of only 1 mol of ethane to yield (HL)ZnEt, a three-coordinate species with one pendant pyrrole NH functionality. This molecule binds the Lewis base p-dimethylaminopyridine (DMAP) to give first a simple 1:1 adduct that eliminates ethane on heating to form four-coordinate LZn(DMAP), which has an unusual structure due to the strong preference of the pincer ligand to bind in a mer (planar) geometry. A molecule with two HL(-) ligands each bonded in a bidentate manner to FeCl2 is synthesized and shown to contain four-coordinate iron with a flattened-tetrahedral structure. The electrochemistry of LM(NCPh) and (L)Zn(DMAP) shows three oxidation processes, which is interpreted to involve at least two oxidations of the pyrrolide arms.

UI MeSH Term Description Entries

Related Publications

Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
December 2015, Angewandte Chemie (International ed. in English),
Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
May 2014, Dalton transactions (Cambridge, England : 2003),
Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
October 2009, Inorganic chemistry,
Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
September 2011, Dalton transactions (Cambridge, England : 2003),
Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
September 2019, Dalton transactions (Cambridge, England : 2003),
Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
August 2012, Dalton transactions (Cambridge, England : 2003),
Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
September 2009, Journal of the American Chemical Society,
Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
October 2013, Inorganic chemistry,
Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
September 2015, Inorganic chemistry,
Nobuyuki Komine, and René W Buell, and Chun-Hsing Chen, and Alice K Hui, and Maren Pink, and Kenneth G Caulton
June 2022, Angewandte Chemie (International ed. in English),
Copied contents to your clipboard!