Synthesis and structures of amine bis(phenolate) lanthanide thiolates and their application in the polymerization of ε-caprolactone

Rare-Earth Complexes Supported by Tripodal Tetradentate Bis(phenolate) Ligands: A Privileged Class of Catalysts for Ring-Opening Polymerization of Cyclic Esters

“…This is also the case for Ln­{ONXO R1,R2 }­(OR)­(donor) n complexes, although a significant number of aryloxides , arguably simpler to prepare due to their lower basicity/donor ability (and hence lower tendency to aggregate), could be isolated and structurally characterized, not only in solution but also in the solid state (Scheme ). − All but one of the complexes structurally characterized were mononuclear in the solid state, with one or two coordinated THF molecules. In the absence of a THF donor, a dinuclear structure with μ-O­(aryloxide) bridges was observed (Scheme ).…”

Lanthanides and actinides: Annual survey of their organometallic chemistry covering the year 2013

“…Presumably the reaction proceeds via protonolysis of intermediate mono(cyclopentadienyl) complexes by p-thiocresol. In the monomeric complexes the L 2− dianion ligand coordinates to the lanthanide ion in an O,N,N,O-tetradentate mode [46].…”

Gallium (III) Complexes Based on Aminobisphenolate Ligands: Extremely High Active ROP-Initiators from Well-Known and Easily Accessible Compounds

“…The latter is very important for catalysis applications [ 13 ]. Aminobisphenolate complexes of main group elements (for example, Al [ 14 , 15 , 16 , 17 , 18 , 19 ], alkali metals [ 20 , 21 , 22 ], Ca [ 21 ], Mg [ 23 ]), transition metals (for example, Ti [ 19 ]) and lanthanides [ 24 , 25 ] have been reported to catalyze ROP reactions, but by now there is absolutely no information not only about catalysis but also about the synthesis of such gallium complexes in general. At the same time, gallium is a non-toxic metal if one may consider the concentrations of metal compounds that remain in the polymer during its synthesis [ 26 ], in addition, there are examples of the use of some gallium complexes in medicine [ 27 ], and gallium complexes of various structures (for example, diamido-ether dianionic ligands, (aminomethyl)phenolate monoanionic ligands, 8-quinolinolato monoanionic ligands, salan dianionic ligands, salen dianionic ligands, bis(imino)phenoxide monoanionic ligands) are active in ROP as initiators, [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ] thus aminobisphenolate gallium derivatives should be considered as potentially promising ROP initiators and interesting targets for their synthesis and investigation of their behavior in ROP.…”