Luminescence Behavior Of Complexes Research Articles

Studies on Structure, optical and magnetic properties of Cd, Zn, Mn and Co complexes of terpyridine ligand

In order to further enrich the research on the synthesis of complexes with terpyridine ligand and transition metals, in this work, 4′-(4-(1H-imidazol-1-yl)phenyl)-2,2′:6′,2′'-terpyridine (Iptpd), 1,2-benzenedicarboxylic acid (1,2-BA) were used to construct metal complexes with Cd2+, Zn2+, Mn2+ and Co2+ by solvothermal reaction, and five complexes were constructed, namely, [Cd(Iptpd)(NO3)2]n (1), [Mn(Iptpd)(NO3)2]n (2), [Zn(Iptpd) (NO3)2·2H2O]n (3), [Mn(Iptpd)(1,2-BA)]2 (4) and [Co3(Iptpd)2(1,2-BA)2(NO3)2·10H2O]n (5); Single crystal x-ray diffraction analyses reveal that complexes 1, 2, 3 and 5 have one-dimensional chain structure, 4 is a binuclear structure. In addition, Luminescence behavior of complexes 1 and 3, magnetic properties of complexes 2 and 4 were investigated. The fluorescent test result shows that complex 1 and 3 have weak fluorescence performance and the fluorescence intensity is lower than that of ligand; The magnetic results indicate that complex 2 has ferromagentic property and 4 has antiferromagentic property.

Potential Anticancer Activities and Catalytic Oxidation Efficiency of Platinum(IV) Complex.

The treatment of an aqueous acetonitrile solution of chloroplatinic acid hydrate H2PtCl6.xH2O and pyridine-2-carbaldehyde-oxime (paOH) in the presence of potassium thiocyanate at room temperature (25°) led to the formation of a new Pt(IV) complex with the formula [Pt(SCN)2(paO)2], (1). Complex 1 was fully characterized by FT-IR, UV-vis and NMR spectroscopic techniques as well as elemental analysis. The crystallographic structure of complex 1 was obtained by single-crystal X-ray diffraction. The structure of complex 1 consists of a distorted octahedral geometrical environment around the platinum center in which the coordination sites are occupied by two terminal thiocyanate ligands in trans arrangement and two bidentate paO ligands through four nitrogen atoms. In addition, the in vitro evaluation of the cytotoxicity of platinum complex 1 against four different cancer cell lines was performed. The IC50 values for colon (HCT116), liver (HepG2), breast (MCF-7) and erythroid (JK-1) treated with complex 1 are 19 ± 6, 21 ± 5, 22 ± 6, and 13 ± 3 μM, respectively. In HCT116 cells treated with the IC50 dose of our title compound, apoptosis and necrosis were increased by 34% and 27.8%, respectively. Cells halted in the proliferative phase (S phase) to 21.7 % and 29.8% in HCT116 and HepG2 cells treated with complex 1 have anti-proliferative actions. Furthermore, the catalytic activity of synthesized complex 1 was examined in the oxidation reaction of benzyl alcohols in the presence of an oxidant. Finally, the luminescence behavior of complex 1 was investigated.

Synthesis, optical and magnetic research of nicotinic acid ligand Zn, Cd, Mn and Co complexes

In this study, a multiple binding sites ligand, 5-(4-carboxyphenoxy)nicotinic acid ligand (H2cpna), was used to construct metal complexes with Zn2+, Cd2+, Mn2+ and Co2+ by solvothermal reaction, and four new complexes were constructed, namely, [Zn (cpna)•H2O]n (1)，[Cd (cpna) (CH3CN)·2H2O]n (2), [Mn (cpna)•2H2O]n (3) and Co(cpna)•2H2O]n (4); All the complexes were characterized by single crystal X-ray diffraction, elemental analysis and infrared analysis in the solid state; Single crystal x-ray diffraction analyses reveal that complexes 1 and 2 have two-dimensional network structures, complexes 3 and 4 have three-dimensional structures. In addition, Luminescence behavior of complex 1 and 2 was investigated and magnetic properties of complex 3 and 4 were studied. The fluorescent test results show that the fluorescence intensity of complex 1 is higher than that of ligand and emission band can be considered as LLCT emission of ligand; The Magnetic results indicate weak ferromagentic interactions in complex 3 and χmT value rises slowly and then decreases sharply from 300 ​K to 2 ​K. However, magnetic results indicate antiferromagentic interactions in complex 4 and χmT value can be divided into three parts with the change of temperature from 300 ​K to 2 ​K.

Novel Holmium (Ho) and Praseodymium (Pr) ternary complexes with fluorinated-ligand and 4,5-diazafluoren-9-one

Four ternary complexes Ln 1 and Ln 2 (Ln=Ho and Pr) were synthesized, with 4,4,5,5,6,6,6-heptafluoro-1-(2-thienyl)hexane-1,3-dione and 4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-pentadecafluoro-1-(naphthalen-2-yl)decane-1,3-dione served as main sensitizers, respectively. Their elemental analyses, Fourier Transform Infrared spectra, and luminescent properties were investigated. The complexes all show the characteristic near-infrared luminescence of corresponding Ln 3+ ions, via an antenna effect. Furthermore, the influence of ligands structure on the luminescence behavior of complexes is discussed and it is believed that the fluorinated alkyl chains of ligands affect the energy transfer in complexes.

Synthesis, Characterization and Crystal Structures of Lanthanide Phenoxyacetate Complexes with 1,10‐Phenanthroline

AbstractThree new lanthanide phenoxyacetate complexes with 1,10‐phenanthroline. [Nd(POA)3 (phen)]2 · 2C2H5OH (1), [Eu(POA)3‐ (phen)]2 · 2C2H5OH (2) and [Sm(POA)2(DMSO)(phen)]2‐ (ClO4)2 (3) (POA= phenoxyacetate, phen = 1,10‐phenanthroline, DMSO = dimethyl sulfoxide), were synthesized and characterized by elemental analyses, IR, UV‐vis and FAB‐MS spectra. Their structures were determined by single crystal X‐ray diffraction analysis. In complexes 1 and 2, the carboxylate groups are bonded to Ln3+ ion in three modes: the chelating bidentate, the bridging bidentate and the bridging tridentate. In complex 3, the carboxylate groups are bonded to Sm3+ ion only involved in one mode: the bridging bidentate. The luminescence behavior of complex 2 was also studied by means of emission spectra.