The synthesis and investigation of the physicochemical properties of a novel one-dimensional (1D) hybrid organic− inorganic perovskitoid templated by the 1,1,1-trimethylhydrazinium (Me 3 Hy + ) cation are reported. (Me 3 Hy)[PbI 3 ] crystallizes in the hexagonal P6 3 /m symmetry and undergoes two phase transitions (PTs) during heating (cooling) at 322 (320) and 207 (202) K. Xray diffraction data and temperature-dependent vibrational studies show that the second-order PT to the high-temperature hexagonal P6 3 /mmc phase is associated with a weak change in entropy and is related to weak structural changes and different confinement of cations in the available space. The second PT to the lowtemperature orthorhombic Pbca phase that corresponds to the high change in entropy and dielectric switching is associated with an ordering of the trimethylhydrazinium cations, re-arrangement and strengthening of hydrogen bonds, and slightly shifted lead-iodide octahedral chains. The high-pressure Raman data revealed two additional PTs, one between 2.8 and 3.2 GPa, related to the symmetry decrease, ordering of the cations, and inorganic chain distortion, and the other in the 6.4−6.8 GPa range related to the partial and reversible amorphization. Optical studies revealed that (Me 3 Hy)[PbI 3 ] has a wide band gap (3.20 eV) and emits reddishorange excitonic emission at low temperatures with an activation energy of 65 meV.

Within the broad group of Fe non-heme oxidases, our attention was focused on the catechol 1,2- and 2,3-dioxygenases, which catalyze the oxidative cleavage of aromatic rings. A large group of Fe complexes with N/O ligands, ranging from N3 to N2O2S, was developed to mimic the activity of these enzymes. The Fe complexes discussed in this work can mimic the intradiol/extradiol catechol dioxygenase reaction mechanism. Electronic effects of the substituents in the ligand affect the Lewis acidity of the Fe center, increasing the ability to activate dioxygen and enhancing the catalytic activity of the discussed biomimetic complexes. The ligand architecture, the geometric isomers of the complexes, and the substituent steric effects significantly affect the ability to bind the substrate in a monodentate and bidentate manner. The substrate binding mode determines the preferred mechanism and, consequently, the main conversion products. The preferred mechanism of action can also be affected by the solvents and their ability to form the stable complexes with the Fe center. The electrostatic interactions of micellar media, similar to SDS, also control the intradiol/extradiol mechanisms of the catechol conversion by discussed biomimetics.

A palladium complex of non-innocent ligand a was synthesized, and characterized by IR, UV-Vis, 1H and 13C NMR spectroscopies and elemental analysis.