Gold Complexes with Difunctional Perfluoroalkyl Chains: Quantifying the Energy of Aurophilic Interactions in Flexible Open‐Chain Complexes

2020 ◽  
Vol 132 (35) ◽  
pp. 15332-15337
Author(s):  
Alejandro Portugués ◽  
Lydia González ◽  
Delia Bautista ◽  
Juan Gil‐Rubio
Keyword(s):  
Gold Complexes ◽  
Open Chain ◽  
Chain Complexes ◽  
Aurophilic Interactions

Synthesis and solid-state structures of gold(i) complexes of diphosphines

2016 ◽  
Vol 40 (7) ◽  
pp. 6467-6474 ◽  
Author(s):  
Sebastian Molitor ◽  
Christoph Mahler ◽  
Viktoria H. Gessner
Keyword(s):  
Solid State ◽  
Structure Formation ◽  
Gold Complexes ◽  
Solid State Structures ◽  
Aurophilic Interactions

A series of diphosphine bis(gold) complexes were synthesised and the importance of aurophilic interactions for their structure formation was studied.

Digold(I) Complexes Derived from 5,5′-Bibenzimidazolin-2-ylidene Ligands

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1248-1252 ◽  
Author(s):  
Mareike C. Jahnke ◽  
Christian Schulte to Brinke ◽  
F. Ekkehardt Hahn
Keyword(s):  
Molecular Structure ◽  
Silver Oxide ◽  
Silver Complexes ◽  
X Ray Diffraction ◽  
Gold Complexes ◽  
Metal Centers ◽  
X Ray ◽  
Steric Crowding ◽  
Aurophilic Interactions

Abstract The 5,5′-bibenzimidazolium dibromide salts 2 and 3 have been prepared by fourfold N-alkylation of 5,5′-bibenzimidazole (2: R=Pr; 3: R=Bu). The diazolium salts were treated with silver oxide, and the in situ-formed silver complexes were subsequently reacted with [AuCl(SMe2)] to give the dinuclear gold complexes 4 and 5. The molecular structure of complex 5 has been determined by X-ray diffraction showing linearly coordinated gold(I) centers and, most likely due to steric crowding around the metal centers, no aurophilic interactions.

Intramolecular aurophilic interactions in dinuclear gold(i) complexes with twisted bridging 2,2′-bipyridine ligands

2021 ◽  
Author(s):  
Nikita Y. Shmelev ◽  
Tesfu H. Okubazghi ◽  
Pavel A. Abramov ◽  
Vladislav Y. Komarov ◽  
Mariana I. Rakhmanova ◽  
...  
Keyword(s):  
Gold Complexes ◽  
Bipyridine Ligand ◽  
Aurophilic Interactions

Five new luminescent dinuclear gold(i) complexes with an atypical twisted bridging 2,2′-bipyridine ligand have been obtained and structurally characterized. The structures of these gold complexes have some similarities with a crab body.

X-ray structural and nuclear magnetic resonance study of open chain and macrocyclic thioether complexes

1990 ◽  
Vol 68 (8) ◽  
pp. 1357-1363 ◽  
Author(s):  
C. Robert Lucas ◽  
Shuang Liu ◽  
Michael J. Newlands ◽  
Eric J. Gabe
Keyword(s):  
Nmr Spectra ◽  
Chemical Exchange ◽  
Variable Temperature ◽  
Low Frequency ◽  
Nuclear Magnetic Resonance Study ◽  
Conformational Exchange ◽  
Open Chain ◽  
H Nmr ◽  
Chain Complexes ◽  
C Nmr

Preparations of the thiophenophane and open chain thioether complexes MX2•BBTE(M = Pd; X = Cl, I)(M = Pt; X = Cl) (BBTE = 1,2-bis(benzylthio)ethane) and MX2•L (M = Pd; X = Cl, Br, I, SCN) (M = Pt; X = Cl) (L = 2,5,8-trithia[9](2,5)thiophenophane) are described. The molecular structure of PdBr2•L which contains a weak thiophene-sulfur-to-palladium interaction has been determined: space group P21/n, a = 8.3569(3), b = 16.3254(15), c = 11.1462(3) Å, β = 92.833(4)°, Z = 4, Rf = 0.060, Rw = 0.058. The electronic, low frequency ir, and 13C nmr spectra are described. Variable temperature 1H nmr spectra are discussed and it is concluded that the open chain complexes undergo rapid conformational exchange at room temperature but are configurationally rigid unless the temperature is increased. In contrast, the macrocyclic complexes undergo very limited conformational and no configurational exchange up to their decomposition temperatures. They are also nonfluxional in the same temperature range. Chemical exchange of acidic ligand hydrogens and a metal–ligand dissociative equilibrium were also detected when X = SCN. Keywords: thiophene, thioether, macrocyclic metal complexes.

Synthesis, structure and spectroscopic properties of nickel(II) macrocyclic and open-chain complexes resulted from 1-phenyl-butane-1,3-dione mono-S-methylisothiosemicarbazone template self-condensation

2001 ◽  
Vol 313 (1-2) ◽  
pp. 30-36 ◽  
Author(s):  
Julieta I Gradinaru ◽  
Yurii A Simonov ◽  
Vladimir B Arion* ◽  
Polina N Bourosh ◽  
Maria A Popovici ◽  
...  
Keyword(s):  
Spectroscopic Properties ◽  
Open Chain ◽  
Chain Complexes

Electronmicroscopic localization of ribonucleic acids in ciliate Bursaria truncatella during cell division

1990 ◽  
Vol 48 (3) ◽  
pp. 132-133
Author(s):  
Vladimir Popenko ◽  
Natalya Cherny ◽  
Maria Yakovleva
Keyword(s):  
Cell Division ◽  
High Specificity ◽  
Longitudinal Axis ◽  
Gold Complexes ◽  
Somatic Nucleus ◽  
Ribonucleic Acids ◽  
Biological Meaning ◽  
Bivalent Cations ◽  
Lowicryl K4m ◽  
Short Time

Highly polyploid somatic nucleus (macronucleus) of ciliate Bursaria truncatella under goes severe changes in morphology during cell division. At first, macronucleus (Ma) condences, diminishes in size and turns perpendicular to longitudinal axis of the cell. After short time, Ma turns again, elongates and only afterwards the process of division itself occurs. The biological meaning of these phenomena is not clear.Localization of RNA in the cells was performed on sections of ciliates B. truncatella, embedded in “Lowicryl K4M” at various stages: (1) before cell division (Figs. 2,3); (11) at the stage of macronucleus condensation; (111) during elongation of Ma (Fig.4); (1111) in young cells (0-5min. after division). For cytochemical labelling we used RNaseAcolloidal gold complexes (RNase-Au), which are known to bind to RNA containing cell ularstructures with high specificity. The influence of different parameters on the reliability and reproducibility of labelling was studied. In addition to the factors, discussed elsewhere, we found that the balance of mono- and bivalent cations is of great significance.

Photoredox Reactions of Iodo Iron(III) Complexes Containing Tetradentate Ligands

2001 ◽  
Vol 66 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Jozef Šima ◽  
Dáša Lauková ◽  
Vlasta Brezová
Keyword(s):  
Schiff Bases ◽  
Spin Trapping ◽  
Molar Ratio ◽  
Oh Radicals ◽  
Solvated Electrons ◽  
Open Chain ◽  
Tetradentate Ligands ◽  
Visible Irradiation ◽  
Epr Spin Trapping ◽  
Spin Trapping Technique

Photoredox reactions occurring in irradiated methanolic solutions of trans-[FeIII(R,R'-salen)(CH3OH)I], where R,R'-salen2- are N,N'-ethylenebis(R,R'-salicylideneiminato), tetradentate open-chain N2O2-Schiff bases with R,R' = H, 5-Cl, 5-Br, 3,5-di-Br, 3,5-di-(CH3), 3-OCH3, 5-OCH3, have been investigated and their mechanism proposed. The complexes are redox-stable in the dark. Ultraviolet and/or visible irradiation of methanolic solution of the complexes induces photoreduction of Fe(III) to Fe(II). Depending on the composition of the irradiated solutions, •CH2OH radicals or solvated electrons were identified by the EPR spin trapping technique. The final product of the photooxidation coupled with the photoreduction of Fe(III) is formaldehyde and the molar ratio of Fe(II) and CH2O is close to 2 : 1. The efficiency of the photoredox process is strongly wavelength-dependent and influenced by the peripheral groups R,R' of the tetradentate ligands.

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