Recommanded Product: cis-Dichlorobis(pyridine)platinum(II). Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: cis-Dichlorobis(pyridine)platinum(II), is researched, Molecular C10H10Cl2N2Pt, CAS is 15227-42-6, about Interaction of cis platinum(II) compounds with poly(L-glutamate). A doubly anchored spin-label and a doubly anchored chromophore-label. Author is Chao, Yen Yau H.; Holtzer, Alfred; Mastin, Stephen H..
The free-radical 4-amino-2,2,6,6-tetramethylpiperidinyl-1-oxy [14691-88-4] yields cis-Pt(ATMPO)2(NO3)2 [64716-94-5], which is used to label poly(L-glutamate) (I), poly(L-aspartate) (II), and poly(L-lysine) (III). Labeling occurs by displacement of nitrate by polymer side chains. EPR spectra of oriented films of labeled I are strongly anisotropic; several arguments suggest that the major cause is g anisotropy. Spectra of solutions, in several solvents, of labeled I are also anisotropic and monitor the helix-coil transition and polymer aggregation. Since monofunctional, side-chain labels show only isotropic motions, Pt must be bifunctionally anchored to adjacent carboxylates, requiring the label to follow backbone segmental motions. With shorter side chains (II) adjacent double anchoring is impossible; with longer side chains (III), flexibility reduces coupling to backbone motion; in each, therefore, spectra are isotropic. Chromophoric compounds, particularly cis-Pt(bipy)(H2O)2][NO3]2 [64800-95-9], are similarly used. Bifunctional attachment is evidenced by the absence of base-induced UV spectral shifts (characteristic of attachment of OH- to Pt) shown by label alone, and by similarity of the spectra of labeled polymer and labeled oxalate. Induced CD appears for α helix in the region of the chromophore π-π* bands; transition to random coil drastically reduces this CD. With extensively labeled polymer differences in the course of the helix-coil transition as monitored by CD in the backbone region with that monitored in the chromophore region show that the label stabilizes its attached helical residue. A study of Corey-Pauling-Koltun models and extant theories suggests that the induced CD arises by coupling of the carboxylate π-π* and the bound chromophore 1B1 elec. transition moments.
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