SDS of cas: 1663-45-2. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 1,2-Bis(diphenylphosphino)ethane, is researched, Molecular C26H24P2, CAS is 1663-45-2, about Chiral expression of co-crystallizing poly(thiophene)-block-poly(selenophene) copolymers. Author is Timmermans, Birgitt; Koeckelberghs, Guy.
In this report, the chiral expression of co-crystallizing conjugated poly(thiophene)-b-poly(selenophene) copolymers is investigated. For this purpose, different poly(thiophene)-b-poly(selenophene) copolymers were synthesized via controlled Kumada catalyst transfer condensative polymerization (KCTCP). The homopolymers, poly(thiophene) and poly(selenophene), are synthesized as a reference Solvatochromism experiments were conducted to investigate the (chiral) self-assembly of all the polymers using UV-vis and CD (CD) spectroscopy. It was found that, although the chiral homopoly(selenophene) surprisingly did not self-assemble in a chiral way, the block copolymers did show a chiral expression. This can only be explained by the suggested co-crystallization of the block copolymers, since for (micro)phase-separating block copolymers no chiral expression would be expected, as the first aggregating block, in this case the poly(selenophene) block, then would dictate its stacking to the second block. Differential scanning calorimetry (DSC) further suggested the co-crystallization of the block copolymers. Moreover, the chiral expression of the poly(thiophene)-b-poly(selenophene) copolymers was even larger than for the homopoly(thiophene), which can be explained by the increased disorder present in the block copolymers. Dynamic light scattering (DLS) eliminated the existence of a correlation between the chiral response and the size of the polymer aggregates, further evidencing that the increase in the chiral response of the block copolymers is solely due to the suggested co-crystallization of the block copolymers.
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis