scholarly journals Synthetic access to a phosphorescent non-palindromic pincer complex of palladium by a double oxidative addition – comproportionation sequence

2020 ◽  
Vol 56 (83) ◽  
pp. 12589-12592
Author(s):  
Wolfram Feuerstein ◽  
Frank Breher
Keyword(s):  
Palladium Complex ◽  
Oxidative Addition ◽  
Pincer Complexes ◽  
New Approach ◽  
Pincer Complex

A highly phosphorescent non-palindromic (C^C^N) palladium complex may be prepared by means of a double oxidative addition – comproportionation sequence, which is a new approach for the synthesis of non-palindromic pincer complexes.

Synthesis of a diimidazolylporphyrin pincer palladium complex

2011 ◽  
Vol 15 (07n08) ◽  
pp. 534-538 ◽  
Author(s):  
Jun Yamamoto ◽  
Tomohiro Shimizu ◽  
Shigeru Yamaguchi ◽  
Naoki Aratani ◽  
Hiroshi Shinokubo ◽  
...  
Keyword(s):  
Heck Reaction ◽  
Palladium Complex ◽  
Pincer Complexes ◽  
Catalyst Loading ◽  
High Catalytic Activity ◽  
X Ray Diffraction ◽  
Degree Of Deformation ◽  
X Ray ◽  
Pincer Complex ◽  
Porphyrin Core

A novel NCN type palladium pincer complex based on the porphyrin backbone was synthesized. The palladium atom bound to the meso-carbon of the porphyrin core was effectively supported by two imidazolyl groups. The product was characterized by spectroscopic and X-ray diffraction analysis. The structure of the porphyrinic macrocycle was revealed to be highly distorted by the coordination of the outer palladium center. The degree of deformation was found to be even larger than the analogous palladium pincer complexes in which pyridine groups were employed as the supporting ligands. The complex exhibited high catalytic activity in the Mizoroki-Heck reaction of iodobenzene with butyl acrylate with 0.005% of the catalyst loading.

scholarly journals Halogen Bonding Involving I2 and d8 Transition-Metal Pincer Complexes

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 373
Author(s):  
Marek Freindorf ◽  
Seth Yannacone ◽  
Vytor Oliveira ◽  
Niraj Verma ◽  
Elfi Kraka
Keyword(s):  
Charge Transfer ◽  
Transition Metal ◽  
Bond Strength ◽  
Oxidative Addition ◽  
Halogen Bonding ◽  
Mode Analysis ◽  
Pincer Complexes ◽  
Local Mode ◽  
Electronic Effects ◽  
Pincer Complex

We systematically investigated iodine–metal and iodine–iodine bonding in van Koten’s pincer complex and 19 modifications changing substituents and/or the transition metal with a PBE0–D3(BJ)/aug–cc–pVTZ/PP(M,I) model chemistry. As a novel tool for the quantitative assessment of the iodine–metal and iodine–iodine bond strength in these complexes we used the local mode analysis, originally introduced by Konkoli and Cremer, complemented with NBO and Bader’s QTAIM analyses. Our study reveals the major electronic effects in the catalytic activity of the M–I–I non-classical three-center bond of the pincer complex, which is involved in the oxidative addition of molecular iodine I2 to the metal center. According to our investigations the charge transfer from the metal to the σ* antibonding orbital of the I–I bond changes the 3c–4e character of the M–I–I three-center bond, which leads to weakening of the iodine I–I bond and strengthening of the metal–iodine M–I bond, facilitating in this way the oxidative addition of I2 to the metal. The charge transfer can be systematically modified by substitution at different places of the pincer complex and by different transition metals, changing the strength of both the M–I and the I2 bonds. We also modeled for the original pincer complex how solvents with different polarity influence the 3c–4e character of the M–I–I bond. Our results provide new guidelines for the design of pincer complexes with specific iodine–metal bond strengths and introduce the local vibrational mode analysis as an efficient tool to assess the bond strength in complexes.

Conversion of CO2 from air into formate using amines and phosphorus-nitrogen PN3P-Ru(ii) pincer complexes

2018 ◽  
Vol 20 (18) ◽  
pp. 4201-4205 ◽  
Author(s):  
Chao Guan ◽  
Yupeng Pan ◽  
Eleanor Pei Ling Ang ◽  
Jinsong Hu ◽  
Changguang Yao ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Pincer Complexes ◽  
Pincer Complex

Effective conversion of carbon dioxide from air into formate by a phosphorus-nitrogen PN3P-Ru(ii) pincer complex.

scholarly journals Highly selective hydrogenation of amides catalysed by a molybdenum pincer complex: scope and mechanism

2019 ◽  
Vol 10 (45) ◽  
pp. 10566-10576 ◽  
Author(s):  
Thomas Leischner ◽  
Lluis Artús Suarez ◽  
Anke Spannenberg ◽  
Kathrin Junge ◽  
Ainara Nova ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Selective Hydrogenation ◽  
Pincer Complexes ◽  
Pincer Complex ◽  
First Time

A series of molybdenum pincer complexes has been shown for the first time to be active in the catalytic hydrogenation of amides.

POCOP-type cobalt and nickel pincer complexes bearing an appended phosphinite group

2020 ◽  
pp. 1-7
Author(s):  
Yingze Li ◽  
Jeanette A. Krause ◽  
Hairong Guan
Keyword(s):  
Pincer Complexes ◽  
X Ray ◽  
X Ray Crystallography ◽  
Pincer Complex ◽  
Group Structures ◽  
Cobalt And Nickel

The reaction of 1,3,5-(iPr2PO)3C6H3 with Co2(CO)8 leads to the isolation of a POCOP-type mononuclear pincer complex {κP,κC,κP-2,4,6-(iPr2PO)3C6H2}Co(CO)2 (1) or a tetranuclear species {κP-{κP,κC,κP-2,4,6-(iPr2PO)3C6H2}Co(CO)2}2Co2(CO)6 (2), depending on the ligand to cobalt ratio employed. The latter compound can be an impurity during the synthesis of {2,6-(iPr2PO)2-4-Me2N-C6H2}Co(CO)2, when the ligand precursor 5-(dimethylamino)resorcinol is contaminated with phloroglucinol due to incomplete monoamination. Similarly, the reaction of 1,3,5-(iPr2PO)3C6H3 with NiCl2 in the presence of 4-dimethylaminopyridine provides {κP,κC,κP-2,4,6-(iPr2PO)3C6H2}NiCl (3) bearing an appended phosphinite group. Structures 1–3 have been studied by X-ray crystallography.

Oxidative Addition of Chlorobenzene on an Iron-Cyclopentadienyl Cation to a Low-Valent Palladium Complex

1991 ◽  
Vol 20 (4) ◽  
pp. 615-618 ◽  
Author(s):  
Takanori Aoki ◽  
Youichi Ishii ◽  
Yasushi Mizobe ◽  
Masanobu Hidai
Keyword(s):  
Palladium Complex ◽  
Oxidative Addition ◽  
Low Valent

Ambiguous electrocatalytic CO2 reduction behaviour of a nickel bis(aldimino)pyridine pincer complex

2016 ◽  
Vol 45 (39) ◽  
pp. 15285-15289 ◽  
Author(s):  
Remya Narayanan ◽  
Meaghan McKinnon ◽  
Blake R. Reed ◽  
Ken T. Ngo ◽  
Stanislav Groysman ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Co2 Reduction ◽  
Pincer Complexes ◽  
Pincer Complex ◽  
Reduction Behaviour

The electrochemical properties of two Ni(NNN)X2 pincer complexes are reported where X = Cl or Br and NNN is N,N′-(2,6-diisopropylphenyl)bis-aldiminopyridine.

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