148332-36-9Relevant articles and documents
Unusual Photooxidation of S-Bonded Mercaptopyridine in a Mixed Ligand Ruthenium(II) Complex with Terpyridine and Bipyridine Ligands
Da Silva, Maria Rosana E.,Auvray, Thomas,Laramée-Milette, Baptiste,Franco, Maurício P.,Braga, Ataualpa A. C.,Toma, Henrique E.,Hanan, Garry S.
, p. 4898 - 4905 (2018)
An unusual photooxidation of a coordinated 4-mercaptopyridine (SpyH) ligand in the [Ru(Hmctpy)(dmbpy)(κS-SpyH)]2+complex (Hmctpy = 4′-carboxy-2,2′6′,2″-terpyridine, dmbpy = 4,4′-dimethyl-2,2′-bipyridine) takes place under visible and UV irradiation, in aerated acetonitrile. The [Ru(mctpy)(dmbpy)(κS-SO2py)] sulfinato product has been characterized by a variety of methods, including X-ray diffraction which supports the presence of the Ru-κS-SpyH isomer in the starting complex. The photooxidation of the 4-mercaptopyridine ligand enhances the back-bonding interactions in the complex by means of the strongly acceptor 4-pyridinesulfinato-SO2py species, increasing the redox potential of the Ru(III)/Ru(II) couple significantly from 1.23 to 1.62 V. It also led to pronounced changes in the electronic and NMR spectra of the complexes, corroborated by DFT and ZINDO-S calculations. A possible mechanism based on referenced data of photooxidation has been proposed, which involves the formation of a reactive oxygen species and intermediate endoperoxide species, yielding a very stable Ru-sulfinato product. This novel species exhibits stronger luminescence (Φf = 0.004) than the starting complex under UV excitation.
CO2-Induced Spin-State Switching at Room Temperature in a Monomeric Cobalt(II) Complex with the Porous Nature
Hayami, Shinya,Kawaguchi, Shogo,Komatsumaru, Yuki,Kosaka, Wataru,Lindoy, Leonard F.,Miyasaka, Hitoshi,Nakamura, Masaaki,Nakaya, Manabu,Sugimoto, Kunihisa,Zhang, Yingjie
, p. 10658 - 10665 (2020)
CO2-responsive spin-state conversion between high-spin (HS) and low-spin (LS) states at room temperature was achieved in a monomeric cobalt(II) complex. A neutral cobalt(II) complex, [CoII(COO-terpy)2]?4 H2O (1?4 H2O), stably formed cavities generated via π–π stacking motifs and hydrogen bond networks, resulting in the accommodation of four water molecules. Crystalline 1?4 H2O transformed to solvent-free 1 without loss of porosity by heating to 420 K. Compound 1 exhibited a selective CO2 adsorption via a gate-open type of the structural modification. Furthermore, the HS/LS transition temperature (T1/2) was able to be tuned by the CO2 pressure over a wide temperature range. Unlike 1 exhibits the HS state at 290 K, the CO2-accomodated form 1?CO2 (P (Formula presented.) =110 kPa) was stabilized in the LS state at 290 K, probably caused by a chemical pressure effect by CO2 accommodation, which provides reversible spin-state conversion by introducing/evacuating CO2 gas into/from 1.
Highly cytotoxic copper(II) terpyridine complexes as anticancer drug candidates
Karges, Johannes,Xiong, Kai,Blacque, Olivier,Chao, Hui,Gasser, Gilles
supporting information, (2020/11/26)
Cancer is one of the deadliest diseases worldwide. Chemotherapy remains one of the frequently applied treatment modalities in the clinics. However, as the currently applied agents are associated with severe side effects, scientists are searching for novel chemotherapeutic drugs. Within the last decades, Cu(II) polypyridine complexes have received increasing attention as potential anticancer drug candidates. Herein, the biological activity of terminally functionalised mono- and bis-coordinated Cu(II)-2,2′:6′,2″-terpyridine complexes have been investigated. The bis-coordinated compounds were found to have a cytotoxic effect in the nanomolar range in human adenocarcinomic alveolar basal epithelial cells. Promisingly, the complexes were equally active in the corresponding cisplatin resistant cell line, indicating that they could potentially be useful for the treatment of drug resistant tumours.
Effect of push-pull ruthenium complex adsorption conformation on the performance of dye sensitized solar cells
Araki, Koiti,Guimaraes, Robson R.,Matias, Tiago A.,Rosero, Wilmmer A. A.
, p. 2250 - 2264 (2020/10/13)
A new series of tris-(bipyridyl)ruthenium-like complexes based on the 4-tripheylamine-2,2':6',2''-terpyridine (TPA) push-pull ligand was prepared by incorporation of 4-carboxypyridine (cpy), 4,4'-dicarboxi-2,2'-bipyridine (dcbpy) and 4-carboxyterpyridine ligands (ctpy) ligands, in order to adsorb them on TiO2 in different anchoring conformations. The electron photoinjection and electron recombination processes of the respective dye-sensitized solar cells were greatly influenced by the molecular structure, which defined the surface concentration and surface charge on TiO2, such that the photoconversion efficiency was 10 times larger for [Ru(py)(dcbpy) (TPAtpy)] than for the [Ru(cpy)(bpy)(TPAtpy)](PF6) dye. Molecules anchoring in a more upright position and by a larger number of sites were shown to enhance the electron injection into TiO2 conduction band (CB) improving the short-circuit current (JSC), open circuit voltage (Voc) and the overall photoconversion efficiency. However, a positive net charge in the dye increased the back electron-transfer reactions and induced a decrease in both Voc and conversion efficiency.
