Poe, Todd N.; Molinari, Sarah; Beltran-Leiva, Maria J.; Celis-Barros, Cristian; Ramanantoanina, Harry; Albrecht-Schonzart, Thomas E. published their research in Inorganic Chemistry in 2021. The article was titled 《Influence of Outer-Sphere Anions on the Photoluminescence from Samarium(II) Crown Complexes》.HPLC of Formula: 33100-27-5 The article contains the following contents:
Three Sm(II) crown ether complexes, [Sm(15-crown-5)2]I2 (1), [Sm(15-crown-5)2]I2·MeCN (2), and [Sm(benzo-15-crown-5)2]I2 (3), were prepared via the reaction of SmI2 with the corresponding crown ether in either THF or MeCN in good to moderate yields. The compounds were 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 mols. and are bound by the five etheric O atoms from each crown ether to yield 10-coordinate environments. Despite the higher symmetry crystal class of 1 (R3c), the Sm center resides on a general position, whereas in 2 and 3 (both in P21/c) the metal centers lie upon inversion centers. Also, the complexes in 2 and 3 are approximated well by D5d symmetry. The mol. in 1, however, is distorted from idealized D5d 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° but at low temperatures transitions to narrow peaks. 2 Only exhibits nonradiative decay at 20° 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 In addition to this study using 1,4,7,10,13-Pentaoxacyclopentadecane, there are many other studies that have used 1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5HPLC of Formula: 33100-27-5) was used in this study.
1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5) is a member of crown ether Ligands. Crown-ethers are macrocyclic polyethers capable of forming host-guest complexes, especially with inorganic and organic cations. Crown-ethers can incorporate protonated primary amine compounds by formation of ion-dipole bonds with the oxygen atoms of the chiral selector. Crown-ethers have been widely used for the separation of several pharmaceuticals both in aqueous and non-aqueous media. HPLC of Formula: 33100-27-5
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem