We investigate photo-induced lattice strains of a monoclinic VTe2 thin flake using ultrafast electron diffraction. After photoexcitation by a 190 fs pulse, we observe diffraction intensity oscillations with periods of 35 and 75 ps, which indicate coherent acoustic phonons of two distinct branches. The oscillations of and diffraction intensities have opposite signs, indicating the change of the diffraction angle due to the shear strain. By numerically simulating these diffraction intensities as a function of the monoclinic angle, we evaluate the amplitude of the photo-induced shear strain.
The mononuclear title complex, [VCl2O(C3H8S)2], features a VIV=O double bond [1.5845 (15) Å] in an overall trigonal–bipyramidal coordination environment defined by two Cl− and the S atoms of two (CH3CH2)(CH3)S ligands. In the crystal, pairs of molecules form centrosymmetric dimers via C—H⋯O hydrogen bonds between the methyl C—H group and the oxidovanadium O atom of a neighbouring molecule.
Key indicators: single-crystal X-ray study; T = 150 K; mean (S-C) = 0.003 Å; disorder in main residue; R factor = 0.023; wR factor = 0.057; data-to-parameter ratio = 26.1.The dinuclear compound, [Nb 2 Cl 6 (C 2 H 6 S) 1.7 (C 2 H 6 Se) 1 . The molecule lies on a twofold rotation axis that passes through the middle of this bond as well as through the bridging dimethyl sulfide ligand. The Nb III ion exists in an octahedral coordination environment defined by two terminal and two bridging Cl atoms, and (CH 3 ) 2 Se/(CH 3 ) 2 S ligands. The (bridging) ligand lying on the twofold rotation axis is an ordered (CH 3 ) 2 S ligand, whereas the terminal ones on a general position are a mixture of (CH 3 ) 2 Se and (CH 3 ) 2 S ligands in a 0.647 (2):0.353 (2) ratio (the methyl C atoms are also disordered).
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