Synthesis and magnetic properties of manganese carbonyl complexes with different coordination modes of 3,4,5-triaryl-1,2-diphospholide ligands

Abstract

The set of complexes bis-(μ:η(1),η(1)-3,4,5-triaryl-1,2-diphosphacyclopentadienyl)-bis-(tetracarbonyl manganese(i)) (aryl = C6H5 (), p-FC6H4 (), p-ClC6H4 ()) undergo an irreversible rearrangement to mononuclear 3,4,5-triaryl-1,2-diphosphacymantrenes (). According to quantum-chemical calculations binuclear complexes can be considered to be products of kinetic control and mononuclear species are thermodynamically favorable compounds. The antiferromagnetic intramolecular interaction observed for complexes can be effectively tuned by using substituents in the para-position of the arene ring, whereas mononuclear 1,2-diphosphacymantrenes are diamagnetic.

N‐Heterocyclic Carbene Stabilized Dicarbondiphosphides: Strong Neutral Four‐Membered Heterocyclic 6π‐Electron Donors

“… Selected representative metal complexes with conjugated six‐, five‐, and four‐membered hydrocarbon or phosphaheterocycles A (hydrogen substituted parent), B (2,4,6‐triphenyl substituted), C (substituted as shown), D (hydrogen substituted parent), E (hydrogen substituted parent), F (triphenyl‐substituted), G (per‐methyl substituted), H (tri‐ tert ‐butyl‐substituted), I (di‐mesityl‐substituted) . The prominent CO stretching frequencies are listed below for each complex.…”

N‐Heterocyclic Carbene Stabilized Dicarbondiphosphides: Strong Neutral Four‐Membered Heterocyclic 6π‐Electron Donors

“… Selected representative metal complexes with conjugated six‐, five‐, and four‐membered hydrocarbon or phosphaheterocycles A (hydrogen substituted parent), B (2,4,6‐triphenyl substituted), C (substituted as shown), D (hydrogen substituted parent), E (hydrogen substituted parent), F (triphenyl‐substituted), G (per‐methyl substituted), H (tri‐ tert ‐butyl‐substituted), I (di‐mesityl‐substituted) . The prominent CO stretching frequencies are listed below for each complex.…”