49539-04-0Relevant articles and documents
Cyclometalated Platinum(II) Complexes Bearing Bidentate O,O′-Di(alkyl)dithiophosphate Ligands: Photoluminescence and Cytotoxic Properties
Fereidoonnezhad, Masood,Kaboudin, Babak,Mirzaee, Tabassom,Babadi Aghakhanpour, Reza,Golbon Haghighi, Mohsen,Faghih, Zeinab,Faghih, Zahra,Ahmadipour, Zohreh,Notash, Behrouz,Shahsavari, Hamid R.
, p. 1707 - 1717 (2017)
Mononuclear complexes [Pt(ppy)(S∧S)] (1a, S∧S = O,O′-di(cyclohexyl)dithiophosphate (ctp); 2a, S∧S = O,O′-di(butyl)dithiophosphate (btp)) and [Pt(bzq)(S∧S)] (1b, S∧S = ctp; 2b, S∧S = btp) have been prepared by the reaction of precursor complexes [Pt(C∧N)Cl(dmso)], C∧N = deprotonated form of 2-phenylpyrdine (ppy) and 7,8-benzoquinoline (bzq), and potassium salt of S∧S ligands. All complexes were characterized by NMR spectroscopy, and the structure of 2b was further identified by single crystal X-ray determination. Although the complexes are not luminescent in solution at ambient temperature, they become strong emissive materials (bright green) in solid state (at room temperature) with high quantum yields and long lifetimes in the microsecond domain. In frozen glass state or at low temperature (solid state), these complexes become better emissive in relation to room temperature. UV-vis spectra, supported by TD-DFT calculations, indicate that 1ILCT (intraligand charge transfer) predominates over the other transitions (L = C∧N cyclometalated ligand). Accordingly, 1 and 2 exhibit structured emission bands which display a large involvement of 3LCCT (ligand-centered charge transfer) with lower contribution of 3MLCT (metal to ligand charge transfer) transition in the excited states. Also, biological activities of 1 and 2 were evaluated against three human cancer cell lines including A549 (human lung cancer), SKOV3 (human ovarian cancer), and MCF-7 (human breast cancer). 2a presented an effective potent cytotoxic activity regarding to the cell lines. The cellular localization of 1a and 2a in MCF-7 human cells was investigated by fluorescence microscopy.
Phosphorus-31, Cadmium-113 and Mercury-199 N.M.R. Studies on Dithiolate Complexes of Cadmium and Mercury and Their Phosphine Adducts
Bond, Alan M.,Colton, Ray,Dakternieks, Dainis,Dillon, Michael L.,Hauenstein, Jennifer,Moir, John E.
, p. 1393 - 1400 (2007/10/02)
Phosphorus-31, cadmium-113 and mercury-199 n.m.r. spectra have been recorded for a series of O,O-dialkyldithiophosphate (dtp) and dialkyldithiocarbamate (dtc) complexes of cadmium and mercury in dichloromethane solution.Both types of ligand are labile on the n.m.r. time scale at room temperature, although the exchange of dtc ligands can be slowed at low temperatures.The complexes interact with tributylphosphine and tricyclohexylphosphine (pcy), but at room temperature the phosphines are also labile.At low temperatures, however, the phosphine exchange becomes slow on the n.m.r. time scale to allow identification of the adducts except for Cd(dtc)2 adducts with PBu3 which are still labile at -110 deg C.All the data indicate that cadmium has a lower affinity for phosphine than mercury and that dtc ligands are more strongly bound to the metals than dtp ligands.
