Rational Design of a Near‐infrared Fluorescence Probe for Ca
<sup>2+</sup>
Based on Phosphorus‐substituted Rhodamines Utilizing Photoinduced Electron Transfer
the cytosol, in marked contrast to our previously reported Ca2+ far‐red to NIR fluorescence probebased on the SiR scaffold, CaSiR‐1 AM, which is mainly localized in lysosomes as well as cytosol in living cells. CaPR‐1 showed longer‐wavelength absorption and emission (up to 712 nm) than CaSiR‐1. The new probe was able to image Ca2+ at dendrites and spines in brain slices, and should be a useful tool
Glucose-sensing luminescent dyes, polymers, and sensors are provided. Additionally, systems including the sensors and methods of using these sensors and systems are provided.
A synthesis process for making a benzoxazine compound containing at least one benzoxazine unit from aromatic amine containing at least one primary amino group, at least one phenolic compound with at least one ortho-hydrogen, and alkyl formcel. In one embodiment, the aromatic amine is reacted with alkyl formcel to generate an alkoxymethyl intermediate compound. Subsequently, the intermediate compound is reacted with a phenol to generate the benzoxazine compound. In another embodiment, the benzoxazine compound is formed by reacting aromatic amine with alkyl formcel and phenol in one reaction step. Also disclosed is a method for isolating the alkoxymethyl compound formed by reacting aromatic amine with alkyl formcel. The isolated alkoxymethyl compound is useful as a reactant in a subsequent reaction.
A series of polyamic acid copolymers (co-PAAs) containing phosphorous groups in the main chain were synthesized using different ratios of two diamines, i.e., bis(3-aminophenyl)methyl phosphine oxide (DAMPO) and 4,4′-oxydianiline (ODA), with 3,3′,4,4′-biphenyltetracarboxylic dianhydride (s-BPDA) by polycondensation in N,N′-dimethyacetamide (DMAc). The co-PAA solutions were spun into fibers by a dry-jet
emission and fluorogenicity. However, the applications of heteroatom-substituted rhodamines have been hindered by difficult synthetic routes. Herein, we explored the condensation strategy of diaryl etheranalogues and o-tolualdehyde to synthesize various heteroatom-substituted rhodamines. We found that the electron property and steric effect in the rhodamine 10th position determined the synthetic yield.