scholarly journals The Fascinating Flexibility and Coordination Modes of a Pentamethylene Connected Macrocyclic CNC Pincer Ligand

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1669
Author(s):  
Ronja Jordan ◽  
Doris Kunz
Keyword(s):  
Crystal Structure ◽  
Coordination Chemistry ◽  
Nmr Spectroscopy ◽  
Carbon Atom ◽  
Coordination Mode ◽  
Alkyl Chain ◽  
Crystal Structure Analysis ◽  
Pincer Ligand ◽  
X Ray ◽  
Central Carbon

The coordination chemistry of an electron-rich macrocyclic CNC pincer-ligand consisting of two pentamethylene tethered N-heterocyclic carbene moieties on a carbazole backbone (bimcaC5) is investigated by mainly NMR spectroscopy and X-ray crystal structure analysis. A bridging coordination mode is found for the lithium complex. With the larger and softer potassium ion, the ligand adopts a facial coordination mode and a polymeric structure by intermolecular potassium nitrogen interactions. The facial coordination is also confirmed at a Cp*Ru fragment, while C-H activation under dehydrogenation at the alkyl chain is observed upon reaction with [Ru(PPh3)3Cl2]. In contrast, Pd(OAc)2 reacts under C-H activation at the central carbon atom of the pentamethylene tether to an alkyl-pincer macrocycle.

Substituent effects in solution speciation of the mononuclear and dinuclear trimethylplatinum(iv) iodide complexes of pyridines

2015 ◽  
Vol 39 (5) ◽  
pp. 3536-3542 ◽  
Author(s):  
Biswa Nath Ghosh ◽  
Dieter Lentz ◽  
Sabine Schlecht
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
Structure Analysis ◽  
Substituent Effects ◽  
Crystal Structure Analysis ◽  
X Ray ◽  
H Nmr ◽  
Pyridine Ligands ◽  
Solution Speciation

A series of mononuclear and dinuclear trimethylplatinum(iv) iodide complexes of pyridine ligands have been synthesized and characterized using 1H-NMR spectroscopy and X-ray crystal structure analysis.

The stereochemistry of β -diketo complexes with trimethylplatinum iv. III. The crystal structure of trimethyl (acetylacetonyl-) 2:2'-bipyridyl platinum

1962 ◽  
Vol 266 (1327) ◽  
pp. 527-546 ◽  
Keyword(s):  
Crystal Structure ◽  
Carbon Atom ◽  
Three Dimensional ◽  
Crystal Structure Analysis ◽  
Method Of Least Squares ◽  
Methylene Carbon ◽  
X Ray ◽  
Methylene Carbon Atom ◽  
Active Methylene ◽  
Oxygen Atoms

The results of an X -ray crystal structure analysis of the crystalline complex, (CH 3 ) 3 Pt(CH 3 . CO . CH . CO . CH 3 )C 10 H 8 N 2 , formed by trimethylplatinum with acetylacetone and 2:2'-bipyridyl are presented. There are four monomeric molecules in a monoclinic unit cell having a = 14.863, b = 8.480, c = 13.749 Å, β = 99° 24' at 110±10 °K and space group P 2 1 / c . The atomic positions have been determined by three-dimensional analysis from observations collected at 100 to 120 °K. Refinement, including allowance for anisotropic thermal motion, was carried out by the method of least squares until the value of the residual R was 0.084. The platinum atom is octahedrally co-ordinated to three methyl groups in the cis configuration (Pt—C = 2.05 Å), to the two nitrogen atoms of the bipyridyl (Pt—N = 2.15 Å) and to the central or ‘active methylene’ carbon atom of acetylacetone (Pt—C = 2.36 Å). The oxygen atoms of the acetylacetone take no part in the co-ordination; this is the first example of a β -diketone acting as an unidentate ligand solely through a carbon atom. Comparison of the bond lengths in this and in the dimeric trimethyl 4:6-dioxononyl platinum suggests that in both compounds the β -diketone is in the keto and not the enol form; in the present compound the oxygen atoms are not chelated and the C=0 bonds are not parallel.

Synthetic Access to a Novel Binaphthyl Ligand Bearing a Phosphine and a Triazole Donor Site

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1438-1448 ◽  
Author(s):  
Claudia May ◽  
Yu Sun ◽  
Gotthelf Wolmershäuser ◽  
Werner R. Thiel
Keyword(s):  
Crystal Structure ◽  
Coordination Chemistry ◽  
Structure Analysis ◽  
Donor Site ◽  
Crystal Structure Analysis ◽  
Pure Compound ◽  
Enantiomerically Pure ◽  
X Ray ◽  
First Time

The combination of a diphenylphospinyl and a triazol-3-yl unit was realized for the first time at a 1,1'-binaphthyl backbone. This novel type of P,N-ligand is accessible as an enantiomerically pure compound in just a few steps. First experiments on the coordination chemistry with palladium(II) chloride have been carried out. A series of intermediates and a binuclear palladium(II) complex could be characterized by X-ray crystal structure analysis

Practical Synthesis of a PCP-Type Pincer Ligand and Its Metal Complexes­

Synthesis ◽  
2017 ◽  
Vol 50 (05) ◽  
pp. 1015-1019 ◽  
Author(s):  
Kazutaka Matoba ◽  
Yoshiaki Nishibayashi ◽  
Aya Eizawa ◽  
Shunsuke Nishimura ◽  
Kazuya Arashiba ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Large Scale ◽  
Crystal Structure Analysis ◽  
Synthetic Method ◽  
Pincer Ligand ◽  
X Ray ◽  
Practical Synthesis

A synthetic method for N-heterocyclic carbene- and phosphine-based PCP-type pincer ligand is described on a large scale. Some transition-metal complexes bearing the PCP-type pincer ligand are prepared and characterized by X-ray crystal structure analysis.

scholarly journals Complexes of Dichlorogermylene with Phosphine/Sulfoxide-Supported Carbone as Ligand

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2005
Author(s):  
Ugo Authesserre ◽  
Sophie Hameury ◽  
Aymeric Dajnak ◽  
Nathalie Saffon-Merceron ◽  
Antoine Baceiredo ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Carbon Atom ◽  
Diffraction Analysis ◽  
Coordination Complexes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Central Carbon Atom ◽  
Lone Pairs ◽  
Central Carbon

Due to their remarkable electronic features, recent years have witnessed the emergence of carbones L2C, which consist in two donating L ligands coordinating a central carbon atom bearing two lone pairs. In this context, the phosphine/sulfoxide-supported carbone 4 exhibits a strong nucleophilic character, and here, we describe its ability to coordinate dichlorogermylene. Two original stable coordination complexes were obtained and fully characterized in solution and in the solid state by NMR spectroscopy and X-ray diffraction analysis, respectively. At 60 °C, in the presence of 4, the Ge(II)-complex 5 undergoes a slow isomerization that transforms the bis-ylide ligand into an yldiide.

Mononuclear and dinuclear trimethylplatinum(iv) iodide complexes of 3-substituted pyridines

2017 ◽  
Vol 41 (9) ◽  
pp. 3498-3507 ◽  
Author(s):  
Biswa Nath Ghosh ◽  
Sabine Schlecht ◽  
Antonio Bauzá ◽  
Antonio Frontera
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
X Ray ◽  
H Nmr ◽  
Substituted Pyridines

A series of mononuclear and dinuclear trimethylplatinum(iv) complexes of 3-substituted pyridines has been studied by 1H NMR spectroscopy, DFT computational and X-ray crystal structure analysis.

scholarly journals Crystal structure of (E)-4-nitro-2-(((3-(tetrahydro-8λ4-[1,3,2]oxazaborolo[2,3-b][1,3,2]oxaborol-8-yl)phenyl)imino)methyl)phenol – water (1/2), C17H18BN3O5·2H2O

2016 ◽  
Vol 231 (1) ◽  
pp. 89-91
Author(s):  
Chunhua Ge ◽  
Juanjuan Liu ◽  
Zhe Xü ◽  
Yang Zhang ◽  
Xiangdong Zhang
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Carbon Atom ◽  
Boron Atom ◽  
Crystal Structure Analysis ◽  
Coordination Bond ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr ◽  
Phenol Water

AbstractThe title compound has been synthesized and characterized by IR, 1H NMR, elemental analysis as well as single crystal X-ray diffraction techniques. Crystal structure analysis reveals that the boron atom is tetrahedrally bonding with one carbon atom, one nitrogen atom, and two oxygen atoms. The bond between nitrogen atom and boron atom is a coordination bond.

Zur Struktur und Komplexchemie von Phosphinoderivaten des 5-Methoxy-2(5H)-furanons / Structure and Coordination Chemistry of Phosphino Derivatives of 5-Methoxy-2(5H)-furanon

1980 ◽  
Vol 35 (9) ◽  
pp. 1075-1082 ◽  
Author(s):  
D. Fenske ◽  
H. Prokscha ◽  
P. Stock ◽  
H. J. Becher
Keyword(s):  
Crystal Structure ◽  
Coordination Chemistry ◽  
Structure Analysis ◽  
Model Compound ◽  
Crystal Structure Analysis ◽  
X Ray ◽  
Derivatives Of ◽  
Cl Atoms ◽  
Cl Atom ◽  
Similar Complex

With R2PSi(CH3)3 (R = C6H5, i-C3H7, t-C4H9) one Cl atom of 3,4-dichlor-5-methoxy-2(5 H)-furanon (1) is substituted by the R2P group. An x-ray crystal structure analysis of the phosphino derivative with R = C6H5 (2) it has shown that of the two Cl atoms in 1 only the β-position (to C= O) is substituted. The coordination chemistry of 2 and its bis- (diphenylphosphino) derivative (3) is studied by preparation of the compounds 2 · Mo(CO)5 and 3 · Mo(CO)4. With PdCl2 · 2 C6H5CN (2) gives a dinuclear complex [2 · PdCl2]2, with bridging Cl atoms. The structure is established by a comparison with the similar complex of PdCl2 and 2-chloro-diphenylphosphino-maleic acid dimethylestor, which was synthe­sized as a model compound and studied by x-ray crystal structure analysis.

Über die Umsetzung von Phosphorverbindungen mit dem Strukturelement P(:X)H (X = O, S) mit 1,3,5-Trimethylhexahydro-1,3,5-triazin. Darstellung und Reaktionen α-(N-Methylamino)methyl-substituierter Phosphorverbindungen / Reactions of Phosphorus Compounds Containing the P(:X)H Group (X = O, S) with 1,3,5-Trimethylhexahydro-1,3,5-triazine. Synthesis and Reactions of α-(N-Methylamino)methyl Substituted Phosphorus Compounds

1993 ◽  
Vol 48 (9) ◽  
pp. 1161-1168 ◽  
Author(s):  
Jens R. Goerlich ◽  
Ion Neda ◽  
Michael Well ◽  
Axel Fischer ◽  
Peter G. Jones ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Nmr Spectroscopy ◽  
Methyl Iodide ◽  
Room Temperature ◽  
Crystal Structure Analysis ◽  
Phosphorus Compounds ◽  
Ammonium Iodide ◽  
Tetrahedral Geometry ◽  
X Ray ◽  
Distorted Tetrahedral Geometry

The reactions of the acids la-4a and 8a with 1,3,5-trimethylhexahydro-1,3,5-triazine furnished compounds 1b-4b and 8b. The IR investigation of 1 b, 4b and 8b revealed P=O ··· H—N interactions. In the unusual reaction of lb with methyl iodide the quaternary ammonium iodide [(H3C)2P(:O)CH2N(CH3)3]+I- 1c was formed. The reaction of 2b with methyl iodide produced the ammonium iodide [(H3C)2P(:S)CH2NH2CH3]+I- 2c. The structure of 2c was confirmed by X-ray crystal structure analysis, which showed the expected distorted tetrahedral geometry at phosphorus and revealed N—H ••• I hydrogen bonds. Reaction of 8b with methyl iodide led to the formation of the ammonium iodide 8c by methylation at the nitrogen atom. In the reaction of lb and 2b with HPF6 the compounds 1 d and 2d were obtained. The compounds 1 d and 2d, due to their instability at room temperature, could be identified only by 1H and 31P NMR spectroscopy.

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