Energy transfer between Gd3+ and Sm3+ the effect of Gd3+ on quenching of Sm3+ and intensity parameters of Sm3+ in borate glasses

Reisfeld, R.; Greenberg, E.; Biron, Ehud

doi:10.1016/0022-4596(74)90078-4

Cited by 44 publications

(7 citation statements)

References 22 publications

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“…The s rms deviation of 755 cm À1 show a good fit between the observed and calculated electronic energy levels and are comparable with other Sm 3+ -doped borosulphate [16], phosphate [17], fluorozirconate [18] and borate [19] glasses. The experimental and calculated energy levels and the derived best fit freeion parameters for 1.0 mol% of Sm 3+ ion in LBTAF glass are listed in Table 1.…”

Section: Energy Level Analysis and Free-ion Parameterssupporting

confidence: 69%

“…The experimental and calculated energy levels and the derived best fit freeion parameters for 1.0 mol% of Sm 3+ ion in LBTAF glass are listed in Table 1. It is found that the uniform shift of energy levels of the entire configuration, E AVG that represents the spherically symmetric electron contribution, the net-electrostatic effect, P F K experienced by the Sm 3+ ion and spin-orbit interaction parameter, x values are slightly smaller than other Sm 3+ -doped glass hosts [16][17][18][19]. However, the values of hydrogenic ratios F 2 =F 4 , F 2 =F 6 and F 4 =F 6 indicate the radial integral parts of the f-orbitals of rare-earth ions.…”

Section: Energy Level Analysis and Free-ion Parametersmentioning

confidence: 99%

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Photoluminescence properties of Sm3+ in LBTAF glasses

Jamalaiah

Kumar

Babu

et al. 2009

Journal of Luminescence

139

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Section: Energy Level Analysis and Free-ion Parameterssupporting

confidence: 69%

Section: Energy Level Analysis and Free-ion Parametersmentioning

confidence: 99%

Photoluminescence properties of Sm3+ in LBTAF glasses

Jamalaiah

Kumar

Babu

et al. 2009

Journal of Luminescence

139

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“…After using laser induction [4], time-resolved measurements of the Gd 3+ fluorescence for zircon, anhydrite, and hardystonite have been prepared. The energy transfer among Gd 3+ and many RE 3+ have been analyzed [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. For the studied agrellite sample, the energy transfer from Gd 3+ to RE 3+ could be excluded.…”

Section: Ce 3+ Fluorescencementioning

confidence: 99%

Luminescence of Agrellite Specimen from the Kipawa River Locality

Czaja

Lisiecki

2019

Minerals

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Using steady-state luminescence measurements, the luminescence spectra of Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Dy3+, Er3+ and Yb3+ for the agrellite sample from the Kipawa River region have been measured. The emission spectra of Eu3+ and Dy3+ next to those of Sm3+ and Pr3+ have been measured for characteristic excitation conditions. The most efficient luminescence activator in the studied sample was Ce3+. This ion was also a sensitizer of Pr3+, Sm3+, Eu3+, and Dy3+ luminescence.

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“…§ The study of inter-lanthanide energy transfer in protein systems may also prove fruitful in other protein systems where appropriate hybrid substitutions can be made. Such studies might settle whether inter-lanthanide energy transfer is dipole-dipole (24,28) or dipole-quadrupole (26,27) in nature.…”

mentioning

confidence: 99%

Energy transfer between terbium (III) and cobalt (II) in thermolysin: a new class of metal--metal distance probes.

Horrocks¹,

Holmquist²,

Vallée³

1975

Proc. Natl. Acad. Sci. U.S.A.

106

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The visible fluorescence of terbium(III) when bound to a calcium binding site of thermolysin is greatly enhanced with an excitation maximum at 280 nm but substitution of cobalt(II) for zinc at the-active site decreases the intensity by 89.5%. Treatment with N-bromosuccinimide quenches enzyme tryptophan and Tb(III) fluorescence to a similar extent and suggests the operation of tryptophan Tb(III) -Co(II) energy relay system in the enzyme. Dipoledipole radiationless energy transfer between the Tb(III) donor and the Co(II) acceptor can account for this quenching. The inherent characteristics of the metal pair limits the value of the orientation factor, K2, of the Fbrster equation, thereby reducing uncertainties in distance measurements by energy transfer compared with other systems. A quantum yield of 0.51 yields a value of Bo, the distance for 50% energy transfer, of 19.6 A, and a distance, R, between Tb(III) and Co(II) of 13.7 A, a value identical to that measured for the distance between the active site zinc atom and calcium atom number 1 by x-ray analysis in native thermolysin crystals.The limits of confidence of this measurement are discussed.Energy transfer between two different metal atom sites of a protein provides a new class of probes to measure intramolecular distances of biological macromolecules in solution.The substitution of paramagnetic, chromophoric metal ions, e.g., Co(II), Cu(II), or trivalent lanthanides, for spectroscopically silent ions which are native to metalloenzymes, e.g., Ca(II), Mg(II), or Zn(II), has proven increasingly useful in the study of their structure-function relationships (1). In the arsenal of spectroscopic techniques, fluorescence measurements offer particular advantages, since they can be employed in the study of biological molecules at relatively low concentrations. Certain of the lanthanide ions, principally Tb(III) and Eu(III), can exhibit considerably enhanced fluorescence when replacing Ca(II) in calcium-dependent proteins (2-4) or when bound to nucleic acids (5). Radiationless energy transfer is now an established means to probe distance relationships between organic fluorophoric donors and organic chromophoric acceptors (6, 7).We have now monitored energy transfer between metal ion donors and metal ion acceptors and thereby measured distances between different metal ion sites of thermolysin, a metalloendopeptidase whose metal content and three-dimensional structure are known (8,9 (Fig. 1). * To whom correspondence should be addressed.Hence, Co(II) and Tb(III) substituted thermolysin favors obh servation of inter-ion energy transfer and, owing to its known structure, provides a suitable benchmark for future distance determinations using this technique. EXPERIMENTAL Thermolysin, obtained from Calbiochem (San Diego, Calif.), was recrystallized and rendered zinc free as described (11). Enzyme concentrations were determined by measuring the absorbance at 280 nm, based on the reported absorbance E1%280 = 17.65 (14) and a molecular weight of 34,600 (8).The enzyme was...

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Energy transfer between Gd3+ and Sm3+ the effect of Gd3+ on quenching of Sm3+ and intensity parameters of Sm3+ in borate glasses

Cited by 44 publications

References 22 publications

Photoluminescence properties of Sm3+ in LBTAF glasses

Photoluminescence properties of Sm3+ in LBTAF glasses

Luminescence of Agrellite Specimen from the Kipawa River Locality

Energy transfer between terbium (III) and cobalt (II) in thermolysin: a new class of metal--metal distance probes.

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