Luminescence study of reduced samarium in barium lithium nonaborate and barium sodium nonaborate

Douglas, Dominique L.; Biggers, Maurice O.; Gharavi-Naeini, Jafar; Stump, Nathan A.

doi:10.1016/j.ica.2020.119452

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…The development of methods for the preparation of lanthanide diiodides (Nd, Sm, Dy, Tm, and Yb) − opened the door for a deeper study of divalent lanthanides, including Sm(II), whose compounds exhibit interesting luminescent properties. − These properties, caused by electronic transitions 4f 6 → 4f 6 or 4f 5 5d 1 → 4f 6 can be varied using changes in the ligand environment, pressure, and temperature, which makes Sm(II) complexes useful for sensor applications. In addition, the importance of divalent samarium in organic reactions is great both as a one-electron-reducing agent (especially in the form of SmI 2 ) and as an organometallic reagent.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structure of a Samarium Complex with Perylene

Balashova,

Polyakova,

Ilichev

et al. 2023

Organometallics

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The potassium salt of the perylene ligand used as a precursor in further transformations was obtained by the reduction of perylene with potassium metal in DME or THF. The perylene ligand was transferred to a samarium metal center using a metathesis strategy, yielding a complex SmI(Per)(THF)4. In the resulting compound, samarium remains divalent, while perylene is in the form of a radical anion, which is confirmed by spectroscopic methods and quantum chemical calculations.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Structure of a Samarium Complex with Perylene

Balashova,

Polyakova,

Ilichev

et al. 2023

Organometallics

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“…Some of the earliest studies of divalent lanthanides involved doping them into host matrices that allowed their usefulness as luminescent and magnetic materials to be assessed. − Synthesizing bulk compounds containing divalent lanthanides was dramatically simplified by the development of methods for obtaining several of the lanthanide (Nd, Sm, Eu, Dy, Tm, and Yb) dihalide salts, particularly the diiodide salts, on a larger scale (grams rather than milligrams). , These advances opened the door for greater exploration of divalent lanthanides like Sm(II) that exhibit interesting luminescent properties ,− which arise from electronic states that can be readily modulated to express either 4 f 6 → 4 f 6 or 4 f 5 5 d 1 → 4 f 6 transitions by changing pressure and temperature, making them useful for sensing applications . Additionally, the value of divalent samarium in organic reactions both as a one-electron reductant (especially in the form of SmI 2 ) and as an organometallic reagent is well-known. − The stabilization of samarium’s divalent state is also considered an important precursor for extrapolating the knowledge of low valent lanthanides to their actinide counterparts.…”

Section: Introductionmentioning

confidence: 99%

Influence of Outer-Sphere Anions on the Photoluminescence from Samarium(II) Crown Complexes

et al. 2021

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Three samarium(II) crown ether complexes, [Sm(15-crown-5)2]I2 (1), [Sm(15-crown-5)2]I2·CH3CN (2), and [Sm(benzo-15-crown-5)2]I2 (3), have been prepared via the reaction of SmI2 with the corresponding crown ether in either THF or acetonitrile in good to moderate yields. The compounds have been characterized by single crystal X-ray diffraction and a variety of spectroscopic techniques. In all cases, the Sm(II) centers are sandwiched between two crown ether molecules and are bound by the five etheric oxygen atoms from each crown ether to yield 10-coordinate environments. Despite the higher symmetry crystal class of 1 (R3c), the samarium center resides on a general position, whereas in 2 and 3 (both in P21/c) the metal centers lie upon inversion centers. Moreover, the complexes in 2 and 3 are approximated well by D 5d symmetry. The molecule in 1, however, is distorted from idealized D 5d symmetry, and the crown ethers are more puckered than observed in 2 and 3. All three complexes luminesce in the NIR at low temperatures. However, the nature of the luminescence differs between the three compounds. 1 exhibits broadband photoluminescence at 20 °C but at low temperatures transitions to narrow peaks. 2 only exhibits nonradiative decay at 20 °C and at low temperatures retains a mixture of broadband and fine transitions. Finally, 3 displays broadband luminescence regardless of temperature. Spin–orbit (SO) CASSCF calculations reveal that the outer-sphere iodide anions influence whether broadband luminescence from 5d → 4f or fine 4f → 4f transitions occur through the alteration of symmetry around the metal centers and the nature of the excited states as a function of temperature.

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Luminescence study of reduced samarium in barium lithium nonaborate and barium sodium nonaborate

Cited by 2 publications

References 17 publications

Synthesis and Structure of a Samarium Complex with Perylene

Synthesis and Structure of a Samarium Complex with Perylene

Influence of Outer-Sphere Anions on the Photoluminescence from Samarium(II) Crown Complexes

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