Biologically active compounds containing sulfhydryl groups (RSHs: N-acetyl-Lcysteine, D-penicillamine, glutathione and acetylthiocholine chloride) were used to develop a luminometric method for their quantification. The title substrate capable of chemiluminescence (CL) was isolated in a highly pure state as a chloride salt (99.9% using RP-HPLC) and identified using mass spectrometry (ESI Q-TOF) and 1 H NMR spectroscopy. The cation included in the salt, 9-CMA + , underwent oxidation in an alkaline environment containing RSHs by molecular oxygen, generating CL of various intensities, with no need for the use of hydrogen peroxide. The amount of produced light was linearly proportional to the content of investigated analytes in the system over the concentration range $0.2-2 μM, with the detection limits in the range 0.19-1.73 μM. The mechanism of chemiluminogenic oxidation of 9-CMA + in the

A heavy-atom field effect (HAFE) is discovered in red TADF emitters bearing Br atoms in donor fragment. Depending on the position of heavy atoms, HAFE can either accelerate or inhibit reverse intersystem crossing.

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