3757-88-8Relevant articles and documents
Synthesis, crystal structure and solid state photoluminescence of [Pt(trpy)(C{triple bond, long}CPh)]SbF6 (trpy=2,2′:6′,2″-terpyridine)
Büchner, Riaan,Field, John S.,Haines, Raymond J.,Ledwaba, Lesibana P.,McGuire Jr., Robert,McMillin, David R.,Munro, Orde Q.
, p. 1633 - 1638 (2007)
The synthesis and characterisation of an orange polymorph of [Pt(trpy)(C{triple bond, long}CPh)]SbF6 is described where trpy = 2,2′:6′,2″-terpyridine. An X-ray crystal structure determination at 293 K reveals that the cations are planar and stacked head-to-tail with alternating Pt?Pt distances of 3.604(1) and 4.412(1) ?. The perpendicular distances between successive cation planes are constant along the stack at a value of 3.33 ?. Crystal structure determinations at 240 and 200 K show that reducing the temperature to 200 K has no significant effect on the cation arrangement. However, below 200 K there is a phase change that we have not been able to characterise, but which has an effect on the solid state photoluminescence exhibited by [Pt(trpy)(C{triple bond, long}CPh)]SbF6. Thus, whereas at temperatures of ≥200 K, a broad peak with two components at ca. 566 and 597 nm is observed, below 200 K a longer wavelength peak develops that red-shifts as the temperature is lowered [λ(em)max = 637 nm at 80 K]. We assign the ≥200 K emission as 3MLLCT in origin, since the X-ray data show that ligand-ligand (LL) and not metal-metal (MM) interactions are important at T ≥ 200 K. On the other hand, the long wavelength emission observed below 200 K is typical of 3MMLCT emission, suggesting that the phase change leads to dz2 (Pt) s(-) dz2 (Pt) orbital interactions. Of particular interest is that the cation exhibits 3MLCT emission in dichloromethane that maximizes at 619 nm, i.e., the high temperature solid state emission occurs at a shorter wavelength, an unexpected result since intermolecular interactions in the solid usually cause the emission to occur at longer wavelengths. A possible explanation for this unexpected result is given.
Catalytic Dehydrogenative Stannylation of C(sp)-H Bonds Involving Cooperative Sn-H Bond Activation of Hydrostannanes
Forster, Francis,Rendón López, Victoria M.,Oestreich, Martin
supporting information, p. 1259 - 1262 (2018/02/09)
The catalytic generation of a stannylium-ion-like tin electrophile by heterolytic cleavage of the Sn-H bond in hydrostannanes at the Ru-S bond of Ohki-Tatsumi complexes is reported. Reacting these activated hydrostannanes with terminal acetylenes does not lead to hydrostannylation of the C-C triple bond but to dehydrogenative stannylation of the alkyne terminus. The scope of this rare direct C(sp)-H bond stannylation with hydrostannanes is broad, and a mechanism involving a β-tin-stabilized vinyl cation likely having a bridged structure is presented.
PYRIDINE DERIVATIVES AND APPLICATION OF ANTI-MACOBACTERIUM THEREOF
-
Paragraph 0284; 0285, (2016/10/08)
The present invention provides a series of pyridine derivatives and their preparation method and application thereof. The series of pyridine derivatives can be applied to treating mycobacterium-related diseases, especially to treatments of fatal mycobacterium-related diseases. The fatal diseases may be related to mycobacterium tuberculosis, mycobacterium bovis, mycobacterium avium, and mycobacterium marinum.
