Chiral bidentate N-heterocyclic carbene complexes of Rh and Pd

2004 ◽  
Vol 82 (12) ◽  
pp. 1781-1787 ◽  
Author(s):  
Li Ren ◽  
Austin C Chen ◽  
Andreas Decken ◽  
Cathleen M Crudden
Keyword(s):  
Asymmetric Catalysis ◽  
Palladium Complexes ◽  
Metal Salts ◽  
Carbene Complexes

The synthesis of a new chiral, bidentate oxazoline/imidazolidene carbene precursor is described. This species is reacted with various metal salts in the presence of a base to generate rhodium and palladium complexes, which are characterized spectroscopically and crystallographically.Key words: chiral N-heterocyclic carbene, rhodium, palladium, oxazolidine, asymmetric catalysis.

scholarly journals New Rigid Polycyclic Bis(phosphane) for Asymmetric Catalysis

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 571 ◽  
Author(s):  
K. Pietrusiewicz ◽  
Katarzyna Szwaczko ◽  
Barbara Mirosław ◽  
Izabela Dybała ◽  
Radomir Jasiński ◽  
...  
Keyword(s):  
Asymmetric Catalysis ◽  
Palladium Catalysts ◽  
Density Functional ◽  
Bond Activation ◽  
Palladium Complexes ◽  
Efficient Synthesis ◽  
Phosphorus Ligands ◽  
Functional Theory ◽  
Asymmetric Transformations ◽  
Structural Database

A simple, highly efficient synthesis of a series of novel chiral non-racemic rigid tetracyclic phosphorus ligands, applicable in important chemical asymmetric transformations, was performed. In a tandem cross-coupling/C-H bond activation reaction, a well-recognised and readily available ligand (R,R)-NORPHOS was used as the starting material. The palladium complexes of new ligands were obtained and characterised on the example of a crystalline dichloropalladium complex of [(1R,2R,9S,10S,11R,12R)-4-phenyltetracyclo[8.2.1.02,9.03,8]trideca-3,5,7-triene-11,12-diyl]bis(diphenylphosphane). A notably high activity and stereoselectivity of the palladium catalysts based on the new ligands were confirmed in a model asymmetric allylic substitution reaction. Herein, we discuss the geometry of the palladium complexes formed and its impact on the efficiency of the catalysts. A comparison of their geometric features with other bis(phosphane) ligand complexes found in the Cambridge Structural Database and built density functional theory (DFT) commutated models is also presented and rationalised.

Mechanochemical changes on cyclometalated Ir(iii) acyclic carbene complexes – design and tuning of luminescent mechanochromic transition metal complexes

2020 ◽  
Vol 7 (3) ◽  
pp. 786-794 ◽  
Author(s):  
Jingqi Han ◽  
Kin-Man Tang ◽  
Shun-Cheung Cheng ◽  
Chi-On Ng ◽  
Yuen-Kiu Chun ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Carbene Complexes ◽  
New Class

A new class of luminescent cyclometalated Ir(iii) complexes with readily tunable mechanochromic properties derived from the mechanically induced trans-to-cis isomerization have been developed.

Studies on coordination compoundsformation constants of some metal salts of hydroxyquinones

1960 ◽  
Vol 23 ◽  
pp. 116-123 ◽  
Author(s):  
H KIDO ◽  
W FERNELIUS ◽  
C HAASJR
Keyword(s):  
Metal Salts

Effect of Hydrated Metal Salts on the Coordination Product of Cobalt(II) halide and PNP Type Ligand, 2,6-bis(di-tertbutylphosphinomethyl) pyridine

2018 ◽  
Author(s):  
Tasneem Siddiquee ◽  
Abdul Goni
Keyword(s):  
Metal Salts ◽  
Molar Ratio ◽  
Pincer Complexes ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
Pincer Ligand ◽  
Tetrahedral Geometry ◽  
X Ray ◽  
Distorted Tetrahedral Geometry ◽  
Cobalt Center

Chemical treatment of CoX<sub>2</sub><b><sup>. </sup></b>6H<sub>2</sub>O (X = Cl, Br, I) with the potentially tridentate PNP pincer ligand 2,6-bis(di-<i>tert</i>-butylphosphinomethyl)pyridine in 1:1 molar ratio results in cobalt(II) halide-PNP pincer complexes. The effect of the hydrated metal source on molecular structure and geometry of the complexes was studied by single crystal X-ray diffraction analysis. The complexes are neutral and the cobalt center adopts a penta-coordinate system with potential atropisomerization. Within the unit cell there are two distinct molecules per asymmetric unit. One of the two phosphorus atoms in the PNP ligand was observed to be partially oxidized to phosphinoxide. Disorder in the structure reflects a mixture of square pyramidal and distorted tetrahedral geometry.

Simultaneous Generation of a [2×2] Grid-like Complex and a Linear Double Helicate: A Three-Level Self-Sorting Process

2019 ◽  
Author(s):  
Jean-François Ayme ◽  
Jean-Marie Lehn ◽  
Corinne Bailly ◽  
Lydia Karmazin
Keyword(s):  
Metal Complexes ◽  
Mass Spectroscopy ◽  
Metal Salts ◽  
Simultaneous Generation ◽  
X Ray ◽  
X Ray Crystallography ◽  
Sorting Process

<div>Two constitutional dynamic libraries (CDLs)—each containing two amines, two dialdehydes and two metal salts—have been found to self-sort, generating two pairs of imine-based metallosupramolecular architectures sharing no component, a [2×2] grid-like complex and a linear double helicate. These CDLs provided unique examples of a three-level self-sorting process, as only two imine-based ligand constituents, two metal complexes and two architectures were selected during their assembling out of all the possible combinations of their initial components. The metallosupramolecular architectures assembled were characterized by NMR, mass spectroscopy, and X-ray crystallography.</div>

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