Intramolecular Hydroamination of Aminoalkenes using Rhodium(I) and Iridium(I) Complexes with N,N- and P,N-Donor Ligands

2011 ◽  
Vol 64 (6) ◽  
pp. 741 ◽  
Author(s):  
Thi O. Nguyen ◽  
Bradley Y.-W. Man ◽  
Richard Hodgson ◽  
Barbara A. Messerle
Keyword(s):  
Donor Ligands ◽  
Donor Ligand

Cationic rhodium(i) and iridium(i) complexes containing the bidentate heterocyclic N,N-donor ligand bis(1-pyrazolyl)methane (bpm) and the counterion tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (BArF–) were found to be efficient catalysts for the cyclization of activated and unactivated aminoalkenes. The rates of cyclization were found to be highly dependent upon the size and steric bulk of the substituents at the γ-position of the aminoalkene, with large steric bulk leading to faster rates of cyclization. In comparison, analogous rhodium(i) and iridium(i) complexes with the mixed P,N-donor ligand 1-[2-(diphenylphosphino)ethyl]pyrazole (PyP) were found to be less effective as catalysts for this reaction.

Aggregation-induced phosphorescent emission (AIPE) behaviors in PtII(C^N)(N-donor ligand)Cl-type complexes through restrained D2d deformation of the coordinating skeleton and their optoelectronic properties

2021 ◽  
Author(s):  
hua yang ◽  
Huiying Li ◽  
Ling Yue ◽  
Xi Chen ◽  
Dongdong Song ◽  
...  
Keyword(s):  
Optoelectronic Properties ◽  
Donor Ligands ◽  
Donor Ligand ◽  
Electrochemical Behaviors

A series of four-coordinated PtII(C^N)(N-donor ligand)Cl-type complexes have been synthesized through combination between C^N-type and N-donor ligands with different size. Photophysical features, electrochemical behaviors and electroluminescent (EL) performances have been...

Synthesis and characterization of two stable paramagnetic octahedral chromium(IV) complexes with dianionic tridentate SNO donor ligands and of a chromium(III) complex with a ONO donor ligand

2008 ◽  
Vol 361 (5) ◽  
pp. 1485-1495 ◽  
Author(s):  
Manjuri K. Koley ◽  
Seshadri C. Sivasubramanian ◽  
Babu Varghese ◽  
Periakaruppan T. Manoharan ◽  
Aditya P. Koley
Keyword(s):  
Donor Ligands ◽  
Synthesis And Characterization ◽  
Donor Ligand

scholarly journals Solution X-Ray Absorption Spectroscopy (XAS) for Analysis of Catalytically Active Species in Reactions with Ethylene by Homogeneous (Imido)vanadium(V) Complexes—Al Cocatalyst Systems

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1016 ◽  
Author(s):  
Kotohiro Nomura
Keyword(s):  
Active Species ◽  
Oxidation States ◽  
Donor Ligands ◽  
Ethylene Dimerization ◽  
Edge Structure ◽  
Donor Ligand ◽  
X Ray ◽  
Catalytically Active ◽  
Type V ◽  
X Ray Absorption

Solution V K-edge XANES (X-ray absorption near edge structure) and EXAFS (extended X-ray absorption fine structure) analysis of vanadium(V) complexes containing both imido ligands and anionic ancillary donor ligands (L) of type, V(NR)(L)X2 (R = Ar, Ad (1-adamantyl); Ar = 2,6-Me2C6H3; X = Cl, Me, L = 2-(ArNCH2)C5H4N, OAr, WCA-NHC, and 2-(2’-benzimidazolyl)pyridine; WCA-NHC = anionic NHCs containing weak coordinating B(C6F5)3), which catalyze ethylene dimerization and/or polymerization in the presence of Al cocatalysts, has been explored. Different catalytically actives species with different oxidation states were formed depending upon the Al cocatalyst (MAO, Me2AlCl, AliBu3, etc.) and the anionic ancillary donor ligand employed. The method is useful for obtainment of the direct information of the active species (oxidation state, basic framework around the centered metal) in solution, and for better understanding in catalysis mechanism and organometallic as well as coordination chemistry.

Crystal structures, topological analysis and luminescence properties of three coordination polymers based on a semi-rigid ligand and N-donor ligand linkers

2016 ◽  
Vol 40 (7) ◽  
pp. 5957-5965 ◽  
Author(s):  
Xiaobin Liu ◽  
Zhenyu Xiao ◽  
Ao Huang ◽  
Wen Wang ◽  
Liangliang Zhang ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Coordination Polymers ◽  
Topological Analysis ◽  
Mixed Ligand ◽  
Donor Ligands ◽  
Luminescence Properties ◽  
Donor Ligand ◽  
Ligand Coordination

Three new mixed-ligand coordination polymers have been synthesized based on 3,3′-(anthracene-9,10-diyl)diacrylate acid and different N-donor ligands. Complex 2 displays rapid and selective sensing of Fe3+.

Preparation and characterization of some ternary complexes of copper(II) with o-phenanthroline and oxygen donor ligands

1978 ◽  
Vol 31 (2) ◽  
pp. 459 ◽  
Author(s):  
WL Kwik ◽  
KP Ang
Keyword(s):  
Chelate Ring ◽  
Ternary Complexes ◽  
Donor Ligands ◽  
Ring Size ◽  
Spectral Measurements ◽  
Absorption Bands ◽  
Donor Ligand ◽  
Oxygen Donor ◽  
Infrared Spectral

A series of eight ternary complexes, viz. [Cu(phen)(acac)] Cl and Cu(phen)L(H2O)n(phen = o-phenanthroline; L = a bidentate oxygen donor ligand; n = 0, 1 or 2), have been prepared and characterized by microanalysis, infrared spectral and electronic spectral measurements. The results indicate that the Cu(phen)2+ species has a great affinity for oxygen donor ligands resulting in chelate rings of varying sizes. Infrared spectral data indicate that the Cu-O bond weakens as the oxygen donor chelate ring increases in size; the Cu-N bond appears to be less sensitive to ring size. Tentative assignments for the electronic absorption bands have also been made.

scholarly journals Opportunities and challenges of applying advanced X-ray spectroscopy to actinide and lanthanide N-donor ligand systems

2022 ◽  
Vol 29 (1) ◽  
Author(s):  
Tim Pruessmann ◽  
Peter Nagel ◽  
Laura Simonelli ◽  
David Batchelor ◽  
Robert Gordon ◽  
...  
Keyword(s):  
Donor Ligands ◽  
Physical Processes ◽  
Edge Structure ◽  
Donor Ligand ◽  
X Ray ◽  
Trivalent Lanthanides ◽  
Novel Technique ◽  
Trivalent Actinides ◽  
Spectroscopy Studies ◽  
X Ray Absorption

N-donor ligands such as n-Pr-BTP [2,6-bis(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine] preferentially bind trivalent actinides (An3+) over trivalent lanthanides (Ln3+) in liquid–liquid separation. However, the chemical and physical processes responsible for this selectivity are not yet well understood. Here, an explorative comparative X-ray spectroscopy and computational (L 3-edge) study for the An/Ln L 3-edge and the N K-edge of [An/Ln(n-Pr-BTP)3](NO3)3, [Ln(n-Pr-BTP)3](CF3SO3)3 and [Ln(n-Pr-BTP)3](ClO4)3 complexes is presented. High-resolution X-ray absorption near-edge structure (HR-XANES) L 3-edge data reveal additional features in the pre- and post-edge range of the spectra that are investigated using the quantum chemical codes FEFF and FDMNES. X-ray Raman spectroscopy studies demonstrate the applicability of this novel technique for investigations of liquid samples of partitioning systems at the N K-edge.

IrIII(C^N)(P-donor ligand)Cl-type complexes bearing functional groups and showing aggregation-induced phosphorescent emission (AIPE) behavior for highly efficient OLEDs

2021 ◽  
Author(s):  
Chaofan Yao ◽  
Bochen Li ◽  
Yulin Jin ◽  
Huiying Li ◽  
Xiaolong Yang ◽  
...  
Keyword(s):  
Functional Groups ◽  
Donor Ligands ◽  
Donor Ligand ◽  
Highly Efficient

Based on P-donor ligands of triphenylphosphine and triethylphosphine, a series of IrIII(C^N)(P-donor ligand)Cl-type complexes bearing C^N ligands with functional groups of diphenylamine and carbazole have been successfully prepared. In dilute...

scholarly journals Neutral N-donor ligand based flexible metal–organic frameworks

2016 ◽  
Vol 45 (10) ◽  
pp. 4060-4072 ◽  
Author(s):  
Biplab Manna ◽  
Aamod V. Desai ◽  
Sujit K. Ghosh
Keyword(s):  
Metal Organic Frameworks ◽  
Short Review ◽  
Donor Ligands ◽  
Donor Ligand ◽  
Metal Organic ◽  
Flexible Metal ◽  
Structural Aspects

This short review focuses on the flexibility aspect of MOFs based on neutral N-donor ligands with representative examples concerning the structural aspects and the subsequent properties induced by the reorganization of the frameworks.

scholarly journals Spectrophotometric Study of Bridging N-Donor Ligand-Induced Supramolecular Assembly of Conjugated Zn-Trisporphyrin with a Triphenylamine Core

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4771
Author(s):  
Nirmal K. Shee ◽  
Ju-Won Seo ◽  
Hee-Joon Kim
Keyword(s):  
Binding Constants ◽  
Supramolecular Assembly ◽  
Spectrophotometric Titration ◽  
Spectrophotometric Study ◽  
Donor Ligands ◽  
Bridging Ligands ◽  
Donor Ligand ◽  
Bridging Ligand ◽  
Double Decker ◽  
Assembly Behavior

This article studies the supramolecular assembly behavior of a Zn-trisporphyrin conjugate containing a triphenylamine core (1) with bridging N-donor ligands using the UV-vis spectrophotometric titration method at micromolar concentrations. Our results show that pyridine, a non-bridging ligand, formed a 3:1 open complex with 1. The corresponding binding constant was estimated to be (2.7 ± 0.15) × 1014 M−3. In contrast, bridging ligands, 4,4-bipyridine (BIPY) and 1,3-di(4-pyridyl)propane (DPYP), formed stable 3:2 double-decker complexes with 1 in solution, which collapsed to yield a 3:1 open complex when excess BIPY or DPYP was added. The binding constants for forming BIPY and DPYP double-decker complexes were estimated to be (9.26 ± 0.07) × 1027 M−4 and (3.62 ± 0.16) × 1027 M−4, respectively. The UV-vis titration profiles supported the conclusion that the degradation of the 3:2 double-decker 1∙BIPY complex is less favorable compared to that of 1∙DPYP. Consequently, the formation of the 3:1 1∙DPYP open complex proceeded more readily than that of 1∙BIPY.

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