359647-86-2Relevant articles and documents
Cationic π-electron systems with high quadratic hyperpolarisability
Lambert,Gaschler,N?ll,Weber,Schm?lzlin,Br?uchle,Meerholz
, p. 964 - 974 (2001)
Cationic NLO-chromophores based on tolane π-systems in which conventional electron donors are combined with ionic pyridinio or triorganoammonio and -phosphonio substituents, respectively, perform much better than conventional donor/acceptor-substituted (D/A-substituted) tolanes concerning their hyperpolarisability-transparency trade-off. This effect occurs because ionic acceptors do not enlarge the π-system in contrast to conventional acceptors. The same holds true for benzene-type chromophores. Despite their different electronic nature, the extrapolated maximal high-energy absorption of the ionic chromophore series as well as of the conventional donor/acceptor-tolanes coincide at the absorption energy of unsubstituted tolane. This proves that the maximal blue transparency of a given series of substituted chromophores is governed by the absorption maximum of the unsubstituted parent chromophore. In this way chromophores have been designed with much higher quadratic hyperpolarisability than e.g. p-nitroaniline at about the same absorption wavelength. By applying the same concept, a two- and a three-dimensional highly efficient octupolar NLO-chromophore assembly has also been synthesised.
Metal-organic microstructures: From rectangular to stellated and interpenetrating polyhedra
Shankar, Sreejith,Balgley, Renata,Lahav, Michal,Cohen, Sidney R.,Popovitz-Biro, Ronit,Van Der Boom, Milko E.
, p. 226 - 231 (2015)
Despite the tremendous progress made in the design of supramolecular and inorganic materials, it still remains a great challenge to obtain uniform structures with tailored size and shape. Metal-organic frameworks and infinite coordination polymers are examples of rapidly emerging materials with useful properties, yet limited morphological control. In this paper, we report the solvothermal synthesis of diverse metal-organic (sub)-microstructures with a high degree of uniformity. The porous and thermally robust monodisperse crystalline solids consist of tetrahedral polypyridyl ligands and nickel or copper ions. Our bottom-up approach demonstrates the direct assembly of these materials without the addition of any surfactants or modulators. Reaction parameters in combination with molecular structure encoding are the keys to size-shape control and structural uniformity of our metal-organic materials.
