New BF₂ complexes (PB-1–4) exhibiting intense fluorescence in their solid-state were developed. PB-4 exhibits a reversible mechanochromic response to grinding, and a distinct red-shift of emission is observed.

Four new chiral triorganotin(IV) carboxylates, [(R₃Sn)(O₂C₁₃H₁₇)] _n (R = Me 1, Ph 2), [(R₃Sn)(O₂C₁₃H₁₇)] (R = n-Bu 3), and [(R₃Sn)(O₄C₉H₉)] _n (R = Me 4), have been synthesized by reaction of (S)-(+)-2-(4-isobutyl-phenyl)propionic acid and (R)-(+)-2-(4hydroxyphenoxy)propionic acid with triorganotin(IV) chloride in the presence of sodium ethoxide. The complexes have been characterized by elemental analyses, FT-IR, NMR (¹H, ¹³C, and ¹¹⁹Sn) spectra, and X-ray crystallography diffraction analyses. Structural analyses show that 1 has a 1-D infinite chiral zigzag chain structure. Complexes 2 and 4 have a 1-D spring-like chiral helical chain with a channel, while 3 is a monomer. Antitumor activities of 1–4 have been studied.

Nine new organotin(IV) selenites have been prepared by the reaction of 2-methylbenzeneseleninic acid, 2-methoxybenzeneseleninic acid, 4-isopropylbenzeneseleninic acid, and the corresponding triorganotin(IV) chloride with sodium ethoxide in methanol. The complexes have been characterized by elemental analysis, FT-IR, (¹H, ¹³C, and ¹¹⁹Sn) NMR spectroscopy, and thermogravimetric analysis. Except for 3, 6, and 9, all of the complexes were also characterized by X-ray crystallography diffraction analyses. The structural analyses reveal that 1, 2, 4, 5, 7, and 8 exhibit 1-D infinite chain structures which are generated by bidentate oxygen atoms and five-coordinated tin. Complex 5 forms a 2-D organotin framework linked by intermolecular C–H ··· O interactions. Additionally, 1 and 2 were tested for antitumor activity in vitro.