scholarly journals Sandwich and half-sandwich metal complexes derived from cross-conjugated 3-methylene-penta-1,4-diynes

2017 ◽  
Vol 46 (17) ◽  
pp. 5522-5531 ◽  
Author(s):  
Kevin B. Vincent ◽  
Josef B. G. Gluyas ◽  
Qiang Zeng ◽  
Dmitry S. Yufit ◽  
Judith A. K. Howard ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Electrochemical Methods ◽  
The Cross ◽  
Derivatives Of ◽  
Half Sandwich

Mono-, di- and trimetallic derivatives of the cross-conjugated 3-methylene-penta-1,4-diyne moiety have been prepared, and studied by (spectro)electrochemical methods.

scholarly journals Functionalised Terpyridines and Their Metal Complexes—Solid-State Interactions

Chemistry ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 199-227
Author(s):  
Young Hoon Lee ◽  
Jee Young Kim ◽  
Sotaro Kusumoto ◽  
Hitomi Ohmagari ◽  
Miki Hasegawa ◽  
...  
Keyword(s):  
Solid State ◽  
Metal Complexes ◽  
Crystal Structures ◽  
Weak Interactions ◽  
Dispersion Interactions ◽  
Derivatives Of

Analysis of the weak interactions within the crystal structures of 33 complexes of various 4′-aromatic derivatives of 2,2′:6′,2″-terpyridine (tpy) shows that interactions that exceed dispersion are dominated, as expected, by cation⋯anion contacts but are associated with both ligand–ligand and ligand–solvent contacts, sometimes multicentred, in generally complicated arrays, probably largely determined by dispersion interactions between stacked aromatic units. With V(V) as the coordinating cation, there is evidence that the polarisation of the ligand results in an interaction exceeding dispersion at a carbon bound to nitrogen with oxygen or fluorine, an interaction unseen in the structures of M(II) (M = Fe, Co, Ni, Cu, Zn, Ru and Cd) complexes, except when 1,2,3-trimethoxyphenyl substituents are present in the 4′-tpy.

scholarly journals The Exchange of Cyclometalated Ligands

Molecules ◽  
2021 ◽  
Vol 26 (1) ◽  
pp. 210
Author(s):  
Alexander D. Ryabov
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Bond Activation ◽  
Bond Cleavage ◽  
Cyclopalladated Complexes ◽  
Derivatives Of ◽  
Cyclometalated Ligand ◽  
Incoming Ligand

Reactions of cyclometalated compounds are numerous. This account is focused on one of such reactions, the exchange of cyclometalated ligands, a reaction between a cyclometalated compound and an incoming ligand that replaces a previously cyclometalated ligand to form a new metalacycle: + H-C*~Z ⇄ + H-C~Y. Originally discovered for PdII complexes with Y/Z = N, P, S, the exchange appeared to be a mechanistically challenging, simple, and convenient routine for the synthesis of cyclopalladated complexes. Over four decades it was expanded to cyclometalated derivatives of platinum, ruthenium, manganese, rhodium, and iridium. The exchange, which is also questionably referred to as transcyclometalation, offers attractive synthetic possibilities and assists in disclosing key mechanistic pathways associated with the C–H bond activation by transition metal complexes and C–M bond cleavage. Both synthetic and mechanistic aspects of the exchange are reviewed and discussed.

scholarly journals Synthesis of new half sandwich tetrachloro derivatives of molybdenum(V) and tungsten(V). X-ray structures of (C5HPri4)W(CO)3(CH3) and (C5Et5)WCl4

2002 ◽  
Vol 654 (1-2) ◽  
pp. 109-116 ◽  
Author(s):  
Matthias Bastian ◽  
Dolores Morales ◽  
Rinaldo Poli ◽  
Philippe Richard ◽  
Helmut Sitzmann
Keyword(s):  
X Ray ◽  
Derivatives Of ◽  
Half Sandwich ◽  
And Tungsten

Tanning Performance of a Novel Chrome-Free Complex Tanning Agent: Penetration and Distribution

2021 ◽  
Vol 116 (8) ◽  
Author(s):  
Zhen Wang ◽  
Ya-nan Wang ◽  
Yue Yu ◽  
Bi Shi
Keyword(s):  
Metal Complexes ◽  
Uniform Distribution ◽  
Charge State ◽  
Magnesium Oxide ◽  
Cross Section ◽  
Masking Effect ◽  
Pretreatment Method ◽  
Oxidized Starch ◽  
Novel Complex ◽  
The Cross

Penetration of tanning agent in leather plays an important role in tanning performance and properties of finished leather. A novel complex tanning agent composed of Al–Zr salts and highly-oxidized starch ligand, named TWLZ, was used for chrome-free tanning. The masking effect of highly-oxidized starch reduced the electropositivity of metal complexes, which should help penetration of TWLZ and moderate its fixation during tanning. The effects of tanning agent dosage, basification method and pretreatment method on the distribution of TWLZ in leather were investigated. Using 8% TWLZ and basifying with magnesium oxide benefited the penetration and distribution of TWLZ throughout the cross-section of leather. Pretreatment with an amphoteric organic tanning agent could regulate the charge state of the hide, balance the penetration and fixation of TWLZ, and thus show uniform distribution and satisfactory tanning performance. This work will guide the establishment of TWLZ chrome-free tanning system.

Half-sandwich d 6 metal complexes with bis(pyridine carboxamide)benzene ligand: Synthesis and spectral analysis

2017 ◽  
Vol 1149 ◽  
pp. 162-170 ◽  
Author(s):  
Basava Punna Rao Aradhyula ◽  
Werner Kaminsky ◽  
Mohan Rao Kollipara
Keyword(s):  
Spectral Analysis ◽  
Metal Complexes ◽  
Ligand Synthesis ◽  
Half Sandwich

scholarly journals SYNTHESIS OF CYCLOCARBINOL AND CYCLOCARBINOLATE DERIVATIVES OF CYMANTRENE AND THEIR ANTI-SMOKE EFFECTIVENESS FOR DIESEL FUELS

2019 ◽  
Vol 16 (31) ◽  
pp. 147-155
Author(s):  
Esmira A GULIYEVA ◽  
Zaur H GURBANOV ◽  
Yadigar A JABIYEV ◽  
Fikret SHEKILIYEV ◽  
Gulmamed Z SULEIMANOV ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Synthesis Method ◽  
Single Stage ◽  
Comparative Data ◽  
Basic Process ◽  
Diesel Fuels ◽  
Synthesis Technique ◽  
Diesel Vehicles ◽  
Stage Synthesis ◽  
Derivatives Of

The results of the development of synthesis technique of cyclocarbinol derivatives of cymantrene and the production of relevant barium cyclocarbinolate metal complexes – new, advanced anti-smoke additives were presented. Comparative data on the anti-smoke effectiveness of synthesized compounds and known antismoke additives for diesel fuels were also presented. Established, results of the development of a single-stage synthesis method of cyclocarbinol derivatives of cymantrene can be assumed as a basic process for producing high-effective anti-smoke additives to diesel fuels that comply with the requirements of ecology in operation of diesel vehicles.

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