Photodynamictherapy (PDT) is an attractive therapeutic modality with high therapeutic efficacy and less side effects compared with other therapies. Herein, we developed a series of cyclometalatedIrIIIcomplexes based on 2,2′-biimidazole with different alkyl substitutions (methyl, ethyl, propyl, and butyl). These complexes can efficiently produce singlet oxygen upon light irradiation. In vitro photocytotoxicity
Non-covalent metallophilic interactions were studied by investigating the stacking of two neutral rhodium complexes [Rh2I(R2bim)Cl2(CO)4] (R = Et, ethyl or Pr, propyl) in the solid state. Both dinuclear complexes formed infinite arrays of square planar d8 rhodium centres with intramolecular Rhâ¯Rh distances of 3.1781(5) à (R = Et) and 3.1469(3) à (R = Pr) and the intermolecular Rhâ¯Rh distances of 3.4345(6) à (R = Et) and 3.4403(3) à (R = Pr) between the adjacent molecules. The crystalline solids were stable and did not contain any solvent of crystallization. The effect of the metallophilic interactions on the absorption properties were studied using TD-DFT methods. The computational results indicate a red shift with a shortening Rhâ¯Rh distance. Experimentally, bathochromic effects were also observed. The colour of the crystals was found to be dependent on the temperature, shape of the crystal, and the direction of the incoming light. The general appearance of the crystal was strongly affected by the linearly arranged metal atoms. Both crystalline materials had a metallic lustre typical of chain-like metal systems with metalâmetal interactions.
Triphenylethylene-based biimidazoles showing preferable detection of explosives and their rhenium complexes undergoing chiral and <i>cis</i>–<i>trans</i> transformations
biimidazoles have been structurally reported with two triphenylethylene units following chiral and cis–transtransformations simultaneously. Crystal structures show that the biimidazole ligand exhibits an (M)-trans-(P) configuration, whereas the (M)-cis-(M) mode was observed in the rhenium complex, showing cis–trans configurations between biimidazoles and the relative chiral isomers among adjacent triphenylvinylimidazole
Abstract Zwitterionic coordination compounds with strongly asymmetrical charge distribution were synthesized and characterized. Ring-substituted biimidazoles were used as the primary ligands for Zn and Cucompounds. Formation of Zwitterionic coordination compound was found to be strongly dependent on the pH of the reaction medium as well as on the ring and nitrogen substituents of the ligand. Reaction