52490-94-5Relevant articles and documents
Labile coordination approach for the modulation of the electronic properties of ruthenium(II) and iridium(III) complexes within an n-heterocyclic carbene (NHC)-pyridyl dynamic platform
Mondal, Moumita,Ranjeesh,Gupta, Suraj K.,Choudhury, Joyanta
, p. 9356 - 9362 (2014)
Modulating the functionality of a synthetic transition metal complex by external stimuli is highly important for designing switchable systems. One prerequisite for achieving such dynamic activity is to generate molecular systems with in situ controllable electronic properties. To achieve dynamic control of the electronic properties, here we report the synthesis of two new N-heterocyclic carbene (NHC)-pyridyl IrIII/IrIII (3) and RuII/RuII (4) bimetallic complexes. These complexes include a latent stimuli-responsive labile site. This is utilized successfully for the on-demand, real-time modulation of the electronic properties of the systems in a reversible manner using external agents, as probed by spectroscopic and electrochemical techniques. These results display promising scope in the domain of transition metal-NHC chemistry, which can guide us in developing future smart organometallic systems. the Partner Organisations 2014.
Ruthenium-catalysed multicomponent synthesis of borasiloxanes
Chatterjee, Basujit,Gunanathan, Chidambaram
supporting information, p. 2515 - 2518 (2017/03/01)
We present the selective atom economical synthesis of borasiloxanes using a multi-component approach directly by the one-pot ruthenium catalysed reaction of boranes, silanes and water.
Synthesis and catalytic evaluation of ruthenium-arene complexes bearing imidazol(in)ium-2-thiocarboxylate ligands
Hans, Morgan,Willem, Quentin,Wouters, Johan,Demonceau, Albert,Delaude, Lionel
, p. 6133 - 6142 (2012/01/04)
Five new complexes with the generic formula [RuCl2(p-cymene) (SOC·NHC)] (2-6) were isolated in high yields by reacting the [RuCl 2(p-cymene)]2 dimer with a range of imidazol(in)ium-2- thiocarboxylate zwitterions bearing cyclohexyl, 2,4,6-trimethylphenyl (mesityl), or 2,6-diisopropylphenyl groups on their nitrogen atoms in CH 2Cl2 at -20 °C. All the products were fully characterized by IR and NMR spectroscopy, and the molecular structures of [RuCl2(p-cymene)(SOC·IMes)] (3) and [RuCl2(p- cymene)(SOC·SIMes)] (5) were determined by X-ray diffraction analysis. Coordination of the NHC·COS ligands took place via the sulfur atom. A remarkable shielding of the methine proton on the p-cymene isopropyl group was observed by 1H NMR spectroscopy for complexes 3-6. It is most likely caused by the aromatic ring current of a neighboring mesityl or 2,6-diisopropylphenyl substituent. The catalytic activity of compounds 2-6 was probed in the ring-opening metathesis polymerization (ROMP) of cyclooctene, in the atom transfer radical polymerization (ATRP) of methyl methacrylate, and in the synthesis of enol esters from 1-hexyne and 4-acetoxybenzoic acid. In all these reactions, the [RuCl2(p-cymene)(SOC·NHC)] complexes displayed performances slightly inferior to those exhibited by [RuCl 2(p-cymene)(NHC)] species that result from the reaction of [RuCl 2(p-cymene)]2 with NHC·CO2 inner salts. However, they were significantly better catalyst precursors than the much more robust chelates of the [RuCl(p-cymene)(S2C·NHC)]PF6 type obtained by coordination of NHC·CS2 betaines to the ruthenium dimer. These results suggest that the Ru-(SOC·NHC) motif undergoes a dethiocarboxylation under the experimental conditions adopted for the catalytic tests and leads to the same elusive Ru-NHC active species as the preformed [RuCl2(p-cymene)(NHC)] family of complexes.
