Co-crystallization of the dithiocarbamate complexes [MII(S2CNEt2)2] (M = Cu 1, Ni 2, Pd 3, Pt 4) and 1,3,5-triiodotrifluorobenzene (FIB) gives an isomorphic series of (1–4)∙2FIB co-crystals exhibiting the quadruple Cu/Ni/Pd/Pt...

The complex [Ni(S 2 COEt) 2 ] (1) and 1,4-diiodotertafluorobenzene (1,4-FIB) or 1,3,5-triiodotrifluorobenzene (1,3,5-FIB) were cocrystallized to form solid adducts 1•2(1,4-FIB) and 1•2(1,3,5-FIB), respectively; the structures of the adducts were studied by X-ray crystallography. The introduction of any one of the FIBs dramatically changed the supramolecular architecture of 1, and the structure-directing interactions changed from predominantly Ni•••S semicoordination (in 1) to I•••S halogen bonding between an FIB and the electron-donating S atoms of 1 (in the adducts). The semicoordination bond breaking and halogen bond making upon the interaction of 1 with the FIBs make the employed crystal engineering approach relevant (or even similar) to the molecular synthesis of metal species. The DFT study indicates that the strength of both types of interactions in the adducts are comparable (−3.0 to −4.9 kcal/mol and −4.3 to −4.9 kcal/mol) but very different in regard to their physical nature. If the electrostatics determine the I•••S halogen bonds, the Ni•••S semicoordination bonding is basically dominated by orbital effects.

Halide perovskite nanomaterials are widely used in optoelectronics and photonics due to their outstanding luminescent properties, whereas their strong multiphoton absorption makes them prospective for bioimaging. Nonetheless, instability of perovskites in aqueous solutions is an important limitation that prevents their application in biology and medicine. Here, we demonstrate fluorescence and upconversion imaging in living cells by employing CsPbBr 3 nanocrystals (NCs) that show an improved waterresistance (at least for 24 h) after their coating as individual particles with various silicabased shells. The obtained phTEOS-TMOS@CsPbBr 3 NCs possess high quality, which we confirm with high-resolution transmission and scanning transmission electron microscopy, X-ray diffraction analysis, Fourier-transform infrared and energy-dispersive X-ray spectroscopies, as well as with fluorescence optical microscopy. The developed platform can make the halide perovskite NCs suitable for various bioimaging applications.