Syntheses and crystal structures of [Ir^III{C(CHCO₂Et)(dppm)₂-κ⁴ P,C,C′,P′}ClH]Cl·2.75CH₂Cl₂ and its derivatives, [Ir^III{C(CHCO₂Et)(dppm)₂-κ⁴ P,C,C′,P′}(CH₂CO₂Et)Cl]Cl·CH₃OH·0.5H₂O, [Ir^III{C(CHCO₂Et)(dppm)₂-κ⁴

Abstract

The common structural feature of the four title IrIII compounds is the octa­hedral coordination of the IrIII atom by a PCP pincer complex, a C atom of a (eth­oxy­oxoethanyl­idene)methane group and two variable ligands X (H, CH2CO2Et, Cl) and Y (Cl, CO).

Facial vs. Meridional Coordination Modes in ReI Tricarbonyl Complexes with a Carbodiphosphorane‐based Tridentate Ligand

“…The incorporation of CDPs and related groups in pincer‐type ligands led to the development of highly active catalysts for cross coupling reactions, [17,18] hydroamination and ‐arylation reactions [19–21] . Moreover, the two terminal binding sites of the pincer platform, often tertiary phosphines, enable the stabilization of lower oxidation states that result in electron rich transition metal complexes [12,14,30–32,22–29] …”

“…[19][20][21] Moreover, the two terminal binding sites of the pincer platform, often tertiary phosphines, enable the stabilization of lower oxidation states that result in electron rich transition metal complexes. [12,14,[30][31][32][22][23][24][25][26][27][28][29] One of the first CDP transition metal complexes was the rhenium(VII) complex [({Ph 3 P} 2 C)ReO 3 ] + reported by Sundermeyer and co-workers. [15] In their study, the authors clearly demonstrated that CDPs are capable of stabilizing transition metal centers in high oxidation states.…”