49 results about "Helicene" patented technology

The invention relates to a probe for detecting copper ions and zinc ions. The probe is an imine derivative of [5] helicene. The imine derivative is complexed with copper ions, so that obvious absorption peaks appear in a visible light area, and the copper ions can be detected by using an ultraviolet-visible spectrum. The imine derivative is complexed with zinc ions, so that fluorescence is raised, and the zinc ions can be detected by using a fluorescence spectrum. A preparation method comprises the following steps: firstly, performing a reaction on a [5] helicene compound with hydroxyl and chloromethyl methyl ether; performing a reaction with butyl lithium and DMF continuously to introduce a formyl group on a ortho-position of hydroxyl; and performing a reaction with an amino compound continuously to generate the [5] helicene imine derivative DC. The probe provided by the invention has the advantages that the prepared helicene derivative DC is simple and convenient to synthesize, high in yield, easy to prepare and suitable for amplified synthesis and actual production and application; bivalent copper ions can be detected by using the ultraviolet-visible spectrum, and the bivalent zinc ions can be detected by means of the fluorescence method; the probe as a novel probe can be applied to the field of ion detection; the probe is good in molecular selectivity and high in sensitivity, has the advantages of fast response and obvious phenomenon, and has a wide application prospect.

The invention belongs to the field of organic magnetic materials, and specifically discloses a quadruple helicene free radical molecule characterized by thermally induced magnetic hysteresis loops of conjugated free radicals. The invention also discloses the preparation method of the quadruple helicene free radical, the thermally induced magnetic switching mechanism and the characteristics of the magnetic switching material. The invention constructs helicene multi-radical molecules, and the temperature can regulate the electronic structure of the free radical molecules and the magnetic exchange effect of spin electrons at the molecular level, so that it can show the change of material magnetism under macroscopic conditions. It can be applied to organic magnetic function conversion materials and organic spintronic devices.

The invention provides a naphthalene-based high condensed ring-aza [6] helicene compound (I) and a synthesis method thereof, and belongs to the technical field of chemical engineering. The naphthalene-based high condensed ring-aza [6] helicene compound with a photoelectricity function is successfully prepared from naphthalene and a carbazole derivative serving as raw materials by adopting a photocatalysis ring-closing method. The naphthalene-based high condensed ring-aza [6] helicene compound has the advantages of high yield, short time, simple operation and the like. A common low-cost reagent is used, so that the preparation cost is reduced, and the naphthalene-based high condensed ring-aza [6] helicene compound is easy to popularize and apply. The naphthalene-based high condensed ring-aza [6] helicene compound (I) has very good solubility in different organic solvents, so that the purification of the compound and the preparation of a membrane by using the compound are facilitated. Multiple high condensed ring-aza [6] helicene compounds can be obtained by inserting different substituent groups. The naphthalene-based high condensed ring-aza [6] helicene compound (I) is expected to be widely applied in the fields such as organic electroluminescence, organic field-effect transistors, organic second-order nonlinear or chiral liquid crystal, biological medicines and the like.

The invention discloses a bistable liquid crystal device with an optical writing or optical erasing function and a preparation method thereof. The bistable liquid crystal device comprises a liquid crystal box or liquid crystal film with the thickness of 2-200 micrometers, and a photoresponsive cholesteric liquid crystal composite system is poured into the liquid crystal box or the liquid crystal film; the photoresponsive cholesteric liquid crystal composite system is prepared from, by mass, 60.0 wt%-97.0 wt% of main micro-molecular liquid crystal materials, 0.5 wt%-15.0 wt% of chiral helicene compounds and 0.2 wt%-30.0 wt% chiral compounds; the initial pitch of the photoresponsive cholesteric liquid crystal composite system is p0, and the pitch rises to p1 or decreases to p2 under the irradiation of excitation light. Through a simple process, the cholesteric liquid crystal device capable of stably switching between a planar texture state and a focal conic texture state under the condition of remote non-contact illumination radiation is prepared.