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.
Pyrimidine or pyridine pyridine ketone compound and its preparation method and application (by machine translation)
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Paragraph 0270, (2016/10/09)
The invention discloses a kind of type I of the pyrimidine or pyridine pyridine ketone compound and its preparation and application, which belongs to the technical field of pharmaceutical preparation. The compounds have high-efficient and selectively inhibit the cell cycle dependent kinases (Cdks) CDK4 and CDK6 active, and then by inhibiting CDK4/CDK6 prevent tumor cell division. Therefore, the compounds of this invention can be used for CDK4 and CDK6 the involved in cell cycle control disorders result in various diseases, especially suitable for the treatment of malignant tumors. (by machine translation)