Search results for "telluuri"
showing 8 items of 8 documents
An Unusual Ditelluride: Synthesis and Molecular and Electronic Structures of the Dimer of the Tellurium-Centered Radical [TePiPr2NiPr2PTe]•
2005
Facile formation of the ditelluride [(TePiPr2NiPr2PTe-)2], which exists as a centrosymmetric dimer (see picture: Te green, P purple, N blue, C gray) with a weak Te[BOND]Te bond, embodies a new feature of the chemistry of dichalcogenoimidodiphosphinate ligands. The monotelluride HPiPr2NiPr2PTe analogue is obtained as the P[BOND]H tautomer. peerReviewed
Chalcogen‐Bonding Interactions in Telluroether Heterocycles [Te(CH2)m]n (n=1-4; m=3-7)
2020
The Te…Te secondary bonding interactions (SBI) in solid heterocyclic telluroethers were explored by preparing and structurally characterizing a series of [Te(CH2)m]n (n = 1‐4; m = 3‐7) species. The SBIs in 1,7‐Te2(CH2)10, 1,8‐Te2(CH2)12, 1,5,9‐Te3(CH2)9, 1,8,15‐Te3(CH2)18, 1,7,13,19‐Te4(CH2)20, 1,8,15,22‐Te4(CH2)24, and 1,9,17,25‐Te4(CH2)28 led to the tubular packing of the molecules, as has been observed previously for related thio‐ and selenoether rings. The nature of the intermolecular interactions was explored by solid‐state PBE0‐D3/pob‐TZVP calculations involving periodic boundary conditions. The packing of molecules in 1,7,13,19‐Te4(CH2)20, 1,8,15,22‐Te4(CH2)24, and 1,9,17,25‐Te4(CH2)…
Ruthenium‐assisted tellurium abstraction in bis(thiophen‐2‐yl) ditelluride
2023
The reaction of [RuCl2(CO)3]2 and Te2Tpn2 (Tpn = thiophen-2-yl, C4H3S) in the absence of light resulted in the formation of cct-[RuCl2(CO)2(TeTpn2)2] (1) [cis(Cl)-cis(CO)-trans(TeTpn2)] and TeTpn2 (2) together with the precipitation of tellurium. The complex 1 and the monotelluride 2 were characterized by NMR spectroscopy and single-crystal X-ray diffraction. The decomposition of Te2Tpn2 to TeTpn2 has been monitored by 125Te NMR spectroscopy and seemed to be faster than the ligand substitution in [RuCl2(CO)3]2 by TeTpn2. A catalytic cycle is proposed for the decomposition of Te2Tpn2 to TeTpn2 based on the PBE0-D3/def2-TZVP calculations. peerReviewed
Lifetime measurement of the first excited 2+ state in 112Te
2015
The lifetime of the 2+ → 0+ g.s. transition in the neutron-deficicient nucleus 112Te has been measured for the first time using the DPUNS plunger and the recoil distance Doppler shift technique. The deduced value for the reduced transition probability is B(E2 :0+ g.s. → 2+) = 0.46 ± 0.04 e2b2, indicating that there is no unexpected enhancement of the B(E2 :0+ g.s. → 2+) values in Te isotopes below the midshell. The result is compared to and discussed in the framework of large-scale shell-model calculations. peerReviewed
Identification of excited states in 107,52Te55
2021
Excited states in the extremely neutron-deficient nucleus 107Te have been identified from two separate experiments using the recoil-decay tagging technique. Two connected structures were observed on the basis of γγ-coincidence relations and tentatively assigned as built on the mixed-parentage νg7/2d5/2 and νh11/2 intruder configurations. The observed structures were compared with large-scale shell-model calculations and total Routhian surface calculations. Collective behavior was discovered to persist in the νh11/2 band of 107Te which highlights the shape-polarizing effect of a single valence neutron occupying the h11/2 intruder orbit as the N=50 shell closure is approached. peerReviewed
Tellurium(II)-Centered Dications from the Pseudohalide “Te(OTf)2”
2009
Te for two: Supported by pyridine- or carbene-based ligands, tellurium-centered dications are prepared in high yield and include a dicationic tellurium analogue of the recently synthesized “carbodicarbene”. The key to accessing these compounds is the isolation of a base-stabilized form of TeOTf2 (see structure), a new highly electrophilic reagent for tellurium chemistry. peerReviewed
Experimental and Theoretical Investigations of Tellurium(IV) Diimides and Imidotelluroxanes: X-ray Structures of B(C6F5)3 Adducts of OTe(μ-NtBu)2TeNt…
2005
The hydrolysis of tBuNTe(μ-NtBu)2TeNtBu (1) with 1 or 2 equiv of (C6F5)3B·H2O results in the successive replacement of terminal imido groups by oxo ligands to give the telluroxane-Lewis acid adducts (C6F5)3B·OTe(μ-NtBu)2TeNtBu (2) and [(C6F5)3B·OTe(μ-NtBu)2Te(μ-O)]2 (3), which were characterized by multinuclear NMR spectroscopy and X-ray crystallography. The TeO distance in 2 is 1.870(2) Å. The di-adduct 3 involves the association of four tBuNTeO monomers to give a tetramer in which both terminal TeO groups [d(TeO) = 1.866(3) Å] are coordinated to B(C6F5)3. The central Te2O2 ring in 3 is distinctly unsymmetrical [d(TeO) = 1.912(3) and 2.088(2) Å]. The X-ray structure of (C6F5)3B·NH2tBu (4),…
Theoretical predictions of wimp-nucleus and neutrino-nucleus scattering in context of dark matter direct detection
2018
The nature of dark matter is at present an open question. Assuming the main component of dark matter consists of weakly interacting massive particles (WIMPs), directly detecting such particle via a scattering process with an atomic nucleus would be a strong probe into properties of dark matter. So far direct detection experiments have not provided a conclusive signal of dark matter. Traditionally the experiments aim to detect a coherent, spin- independent, elastic scattering signal which is enhanced by the square of the nuclear mass number. If the coherent channel is for some reason suppressed for WIMP-nucleus interactions, then spin-dependent interactions become important. In this thesis w…