Optical absorption and NMR spectroscopic studies on paramagnetic trivalent lanthanide complexes with 2,2′-bipyridine.

The luminescence of trivalent lanthanide ions has found applications in lighting, lasers, optical telecommunications, medical diagnostics, and various other fields. This introductory review presents the basics of organic and inorganic luminescent materials containing lanthanide ions, their applications, and some recent developments. After a brief history of the discovery, purification and early spectroscopic studies of the lanthanides, the radiative and nonradiative transitions of the 4f electrons in lanthanide ions are discussed. Lanthanide-doped phosphors, glasses and crystals as well as luminescent lanthanide complexes with organic ligands receive attention with respect to their preparation and their applications. Finally, two recent developments in the field of luminescent materials are addressed: near-infrared luminescent lanthanide complexes and lanthanide-doped nanoparticles.

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ChemInform Abstract: Spectroscopic Studies of Cyclometalated Pd(II) and Pt(II) Complexes: Optical Absorption and Emission of Single Crystals of (Pd(thpy)2) and (Pt(thpy)2) (I).

ChemInform ◽

10.1002/chin.198924043 ◽

1989 ◽

Vol 20 (24) ◽

Author(s):

R. SCHWARZ ◽

G. GLIEMANN ◽

L. CHASSOT ◽

P. JOLLIET ◽

A. VON ZELEWSKY

Keyword(s):

Optical Absorption ◽

Single Crystals ◽

Spectroscopic Studies ◽

Absorption And Emission

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Spectroscopic studies of cyclo-metallated Pt(lI) complexes: optical absorption and emission and the structure of single crystal [Pt(bpm)(CN)2]·H2O (bpm = 2,2′-bipyrimidine)

Inorganica Chimica Acta ◽

10.1016/s0020-1693(00)82037-x ◽

1990 ◽

Vol 169 (1) ◽

pp. 63-70 ◽

Cited By ~ 13

Author(s):

Josef Biedermann ◽

Günter Gliemann ◽

Ulrich Klement ◽

Klaus-Jürgen Range ◽

Manfred Zabel

Keyword(s):

Optical Absorption ◽

Single Crystal ◽

Spectroscopic Studies ◽

Absorption And Emission

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Pyrimidine and Purine Mononucleotides Recognition by Trivalent Lanthanide Complexes withN-Acetyl Amino Acids

Journal of Chemical & Engineering Data ◽

10.1021/je9004118 ◽

2010 ◽

Vol 55 (1) ◽

pp. 459-475 ◽

Cited By ~ 12

Author(s):

Hassan A. Azab ◽

Zeinab M. Anwar ◽

Rasha G. Ahmed

Keyword(s):

Amino Acids ◽

Lanthanide Complexes ◽

Trivalent Lanthanide

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Solution chemistry of lanthanide complexes—I. Spectroscopic studies of the complexes formed between lanthanide ions and hydroxy amino acids

Journal of Inorganic and Nuclear Chemistry ◽

10.1016/0022-1902(79)80122-0 ◽

1979 ◽

Vol 41 (12) ◽

pp. 1775-1780 ◽

Cited By ~ 10

Author(s):

Harry G. Brittain

Keyword(s):

Amino Acids ◽

Lanthanide Complexes ◽

Spectroscopic Studies ◽

Solution Chemistry ◽

Lanthanide Ions ◽

Hydroxy Amino

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Spectroscopic studies of the interaction of cationic water-soluble iron(III) meso-tetrakis(4-N-methylpyridiniumyl)porphyrin (FeTMPyP) with ionic and nonionic micelles

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424605000162 ◽

2005 ◽

Vol 09 (02) ◽

pp. 94-108 ◽

Cited By ~ 7

Author(s):

Patrícia S. Santiago ◽

Shirley C. M. Gandini ◽

Marcel Tabak

Keyword(s):

Optical Absorption ◽

Binding Constants ◽

Spectroscopic Studies ◽

Resonance Light Scattering ◽

Water Soluble ◽

Absorption Data ◽

Additional Species ◽

Surfactant Aggregates ◽

Order Of Magnitude ◽

Triton X

Interactions of cationic FeTMPyP with ionic and nonionic micelles have been studied by optical absorption, resonance light scattering (RLS) and 1 H NMR spectroscopies. The equilibrium behavior of FeTMPyP as a function of pH is described by several species in aqueous solution. The presence of phosphate anions leads to the existence of additional species in the acid p H region, probably due to the coordination of phosphates to the iron. FeTMPyP solution as a function of pH in the presence of anionic SDS showed a simplified equilibrium in acidic pH region, favoring the transition to the dimeric species. Titration of FeTMPyP as a function of SDS surfactant concentration showed the presence of three different porphyrin species: free metalloporphyrin monomers (or dimers depending on pH), metalloporphyrin monomers (or dimers) bound to the micelles, and nonmicellar metalloporphyrin/surfactant aggregates. In the case of zwitterionic LPC and HPS, and nonionic TRITON X-100 the nonmicellar metalloporphyrin/surfactant aggregates were not observed. Binding constants were calculated from optical absorption data and have values of 2 × 103 M −1 for SDS being much smaller for HPS (58 M −1), LPC and TRITON X-100. Comparison with our previous data for anionic FeTPPS 4 shows that both the electrostatic factor and hydrophobic forces are relevant in the porphyrin-surfactant interaction: for FeTPPS 4 binding constants to cationic CTAC and zwitterionic HPS are of the same order of magnitude, 1-3 × 104 M −1; for FeTMPyP the delocalization of the positive charges from the periphery substituents into the macrocycle ring leads to reduction of both electrostatic attraction to the micelle as well as hydrophobic character of the porphyrin ring, leading to a 10-fold reduction of binding to the micelles of opposite charge to the porphyrin. NMR data indicated that FeTMPyP is bound to the micelles as an equilibrium of two forms of monomer at pH 2.0, and at pH 9.0 the bound aggregated form (possibly dimers) is observed predominantly with some amount of a monomeric form.

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