Terbium acetate

Time-resolved data (Fig. 46) demonstrates the exchange very clearly. The compound is 0.005 M Eu—0.020 M Tb—0.004 M DMB in acetic acid. A burst of excitation is applied to the DMB while the red emission from the europium is monitored. As the exchange of energy from DMB to terbium is very fast, the buildup corresponds to the longer exchange times from terbium->europium. 

Ioannou et al. [41] reported the use of terbium sensitized fluorescence to develop a sensitive and simple fluorimetric method for the determination of the anthranilic acid derivative, mefenamic acid. The method makes use of radiative energy transfer from anthranilate to Tb(III) in alkaline methanolic solutions. Optimum conditions for the formation of the anthranilate-Tb(III) complex were investigated. Under optimized conditions, the detection limit was 1.4 x 10-8 mol/L, and the range of application was 2.5 x 10 8 to 5.0 x 10 5 mol/L. The method was successfully applied to the determination of mefenamic acid in serum after extraction of the sample with ethyl acetate, evaporation of the organic layer under a stream of nitrogen at 40°C, and reconstitution of the residue with alkaline methanolic terbium solution prior to instrumental measurement. The mean recovery from serum samples spiked with mefenamic acid (3.0 x 10-6, 9.0 x 10-6, 3.0 x 10-5 mol/L) was 101 5%. The within-run precision (RSD) for the method for the two serum samples varied from 2 to 8%, and the day-to-day precision for two concentration levels varied from 2 to 13%. 

The lutetium hahdes (except the fluoride), together with the nitrates, perchlorates, and acetates, are soluble in water. The hydroxide oxide, carbonate, oxalate, and phosphate compotmds are insoluble. Lutetium compounds are all colorless in the solid state and in solution. Due to its closed electronic configuration (4f " ), lutetium has no absorption bands and does not emit radiation. For these reasons it does not have any magnetic or optical importance, see also Cerium Dysprosium Erbium Europium Gadolinium Holmium Lanthanum Neodymium Praseodymium Promethium Samarium Terbium Ytterbium. 

Hayashi has investigated in some detail the ionic photopolymerization of styrene monomers. Free ion lifetimes measured by pulse electrical conductivity measurements were found to agree with those calculated from steady-state conductance measurements. Other studies of interest on radical addition polymerization include the photodimerization of polymers containing thymine bases, diene polymerization by terbium complexes, polymerization of vinyl acetate, and preparation of light-sensitive polyacrylates. 

The coordination sphere of the terbium atom in [Tb(OCTPP)(OAc)(DMSO)2] consists of the four nitrogen atoms of the porphyrin and the oxygen atoms of the bidentate acetate and two DMSO solvent molecules forming a square antiprismatic geometry. The porphyrin ring also manifests a marked saddle distortion, and the displacement of the... 

As demonstrated above in Scheme 6.14a, b, anions such as salicylic acid can be detected in water with the formation of ternary complexes using Tb complexes. In a similar manner, a mono-cationic complex (Scheme 6.14e) was shown by Gray and co-workers to bind salicylic acid as well as salicylurate in water. Meanwhile Georges and Amaud reported a method of salicylic acid detection using a combination of Tb and ethylenediaminetetra-acetic acid (EDTA). The presence of the EDTA prevents the formation of insoluble terbium hydroxides and also acts to exclude water molecules from the coordination sphere of the lanthanide ion, reducing quenching caused by O—H oscillators [73]. 

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