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Cyclohexane-Based Phosphinite Iridium Pincer Complexes : Synthesis, Characterization, Carbene Formation, and Catalytic Activity in Dehydrogenation Reactions

Metalation of two cyclohexane-based phosphinite pincer ligands, cis-POCyPO (4) and trans-POCyPO (5) (POCyPO = {1,3-bis-[(di-tert-butylphosphinito]cyclohexane}−), is reported. In line with previously published results (Dalton Trans. 2009, 8626, DOI: 10.1039/B910798C), ligand 4 undergoes aromatization to give benzene-based complex (POCOP)IrHCl (3) at high temperatures in the presence of [Ir(COD)Cl]2

Cyclometalation reactions on rhodium(I). Evidence for a chelate effect and competing C-H and C-O oxidative additions

The ligand Ph2PC6H4(CH2N(Me)CO(Et)) reacts with (bis(diphenylphosphino)butane) (2,5-norbornadiene)rhodium tetrafluoroborate (2a) and (bis(diphenylphosphino)ethane)(2,5-norbornadiene) rhodium tetrafluoroborate (2b) at room temperature in the presence of hydrogen to displace the norbornadiene and give the chelate complexes 3a,b, in which the phosphorus and the oxygen atoms are coordinated to give an

Synthesis, characterisation and crystal structures of the palladium(II) phosphite complexes cis-[PdI2{cis-(iPr2PO)2C 6H10}] and trans-[Pd2I4{cis-(iPr2PO) 2C6H10}2]

Treatment of 2 equiv. of a mixture of the diphosphite cis, trans-1,3-(iPr2PO)2C6H 10 with [Pd(CO2CF3)2] and sequential addition of an excess of NaI gives the binuclear 16-atom ring chelate complex trans-[Pd2I4{cis-(iPr2PO) 2C6H10}2] (1) and the mononuclear complex cis-[PdI2{cis-(iPr2PO)2C 6H10}] (2) exclusively. NMR spectroscopy and X-ray crystallography have unambiguously determined the structure

Chiral platinum(II) complexes. Crystal and molecular structures of cis-[PtPhCl((R,R)-CHIRAPHOS)] and cis-[PtCl2((R,R)-CHIRAPHOS)]

The reaction between trans-PtPhCl(SMe2)2 and (R,R)-CHIRAPHOS gives cis-[PtPhCl((R,R)-CHIRAPHOS)] (1). The crystals of which are monoclinic, space group P21 with a = 12.875(3), b = 18.012(4), c = 13.864(3) Å, β = 109.71(3)° and Z = 4. In CDCl3 1 reacts with Ph2P(C6H4)CH2N(Me)(COEt) to give cis[PtCl2((R,R)-CHIRAPHOS)] (2), the crystals of which are monoclinic, space group P21 with a = 7.8052(16), b

Mao’s Homeworld(s) : A Comment on the Use of Propaganda Posters in Post-War China

Within cognitive science, narratives are regarded as crucial and fundamental cognitive instruments or tools. As Roger Schank suggests, the identity of (sub-)cultures is to a considerable extent based upon the sharing of narrative structures (Schank. 1995. Tell me a story: Narrative and intelligence. Evanston, IL: Northwestern University Press.). According to Schank, culturally shared stories, as d

Development of a spectro-electrochemical cell for soft X-ray photon-in photon-out spectroscopy

We developed a spectro-electrochemical cell for X-ray absorption and X-ray emission spectroscopy, which are element-specific methods to study local electronic structures in the soft X-ray region. In the usual electrochemical measurement setup, the electrode is placed in solution, and the surface/interface region of the electrode is not normally accessible by soft X-rays that have low penetration d

Effect of amino group protonation on the carboxyl group in aqueous glycine observed by O 1s X-ray emission spectroscopy

The valence electronic structures of the amino acid glycine in aqueous solution were investigated in detail through X-ray emission spectroscopy at O 1s excitation under selective excitation conditions of the C[double bond, length as m-dash]O site in the carboxyl group. The X-ray emission spectra of glycine were similar to that of acetic acid (CH3COOH), suggesting a resemblance between the molecula

Model-data fusion to assess year-round CO2 fluxes for an arctic heath ecosystem in West Greenland (69°N)

Quantifying net CO2 exchange (NEE) of arctic terrestrial ecosystems in response to changes in climatic and environmental conditions is central to understanding ecosystem functioning and assessing potential feedbacks of the carbon cycle to future climate changes. However, annual CO2 budgets for arctic tundra are rare due to the difficulties of performing measurements during non-growing seasons. It

Simulation of dynamical interactions between soil freezing/thawing and salinization for improving water management in cold/arid agricultural region

In cold/arid agricultural regions seasonal freezing/thawing of soils can result in soil salinization in winter; therefore, it is crucial to understand the mechanisms behind soil salinization during winter for better water management in agriculture. In Hetao Irrigation District of Inner Mongolia, northern China, we used the CoupModel (version 5) considering dynamical impacts of salt on soil freezin

Quality of life and tax legislation as an instrument for cultural policy goals, taking private patronage as an example

Historically, private initiative has always been of great significance for the arts. In most Europe-an countries the government took over from the private initiative after World War II. However, private initiative never completely disappeared, this is also true in the second half of the 20th century in which government subsidies were the dominant factor in the funding of the arts and cultural heri