Energy transfer between samarium and europium in phosphate glasses

Reisfeld, R.; Boehm, L.

doi:10.1016/0022-4596(72)90157-0

Cited by 99 publications

(40 citation statements)

References 8 publications

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“…Table 1 summarizes the efficiencies and probabilities of energy transfer in the above sensitizer-activator pairs. (2,27,28). Also Orbach (29,30), Birgeneau (31), Miyakawa and Dexter (32), and Soules and Duke (33) have noted that the transfer rate proportional to the overlap integral was negligible for different no phonon line emission and absorption frequencies.…”

Section: Borate Glassmentioning

confidence: 92%

“…ReisfeM and Boehm (28) have fitted the decay curve of Sm 3+ in phosphate glasses to the theoretical curve oflnokuti and Hirayama and found that the quenching interaction arises from the d-q mechanism. Energy transfer between rare earth ions in tungstates was studied extensively by Van Uitert (37) who concluded that the dipole-dipole and dipole-quadrupole interactions predominate in this matrix.…”

Section: Experimental Evidence For the Inokuti-hirayama Theorymentioning

confidence: 97%

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Excited states and energy transfer from donor cations to rare earths in the condensed phase

Reisfeld

1991

Structure and Bonding

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Section: Borate Glassmentioning

confidence: 92%

Section: Experimental Evidence For the Inokuti-hirayama Theorymentioning

confidence: 97%

Excited states and energy transfer from donor cations to rare earths in the condensed phase

Reisfeld

1991

Structure and Bonding

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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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“…Also, Joshi et al [9] have observed electric dipole-dipole interaction mechanism between Tb 3+ and Er 3+ ions in phosphate glass. Reisfeld et al [10] observed the energy transfer between Sm 3+ and Eu 3+ in phosphate glass; they reported that the energy is transferred by a dipole-quadrupole mechanism.…”

Section: Introductionmentioning

confidence: 97%

Energy transfer from Sm3+ to Er3+ in zinc phosphate glass

et al. 2010

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A study of energy transfer from samarium to erbium ions in zinc phosphate glass has been performed for a range of donor (1.0 wt% fixed) and acceptor concentrations ranging from 0.2 wt% to 1.2 wt%. The intensity of emission spectra of Sm 3+ ions in the presence of Er 3+ ions shows an overall decrease, thereby suggesting a non radiative energy transfer from Sm 3+ ions to Er 3+ ions. The interaction mechanism between the donor and acceptor ions is found to be mainly electric dipole-dipole in nature. The parameters required for the quantitative study of energy transfer e.g. energy transfer efficiencies, transfer probabilities, critical transfer distances have been computed.

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Energy transfer between samarium and europium in phosphate glasses

Cited by 99 publications

References 8 publications

Excited states and energy transfer from donor cations to rare earths in the condensed phase

Excited states and energy transfer from donor cations to rare earths in the condensed phase

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

Energy transfer from Sm3+ to Er3+ in zinc phosphate glass

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