1D Molecular Ladder of the Ionic Complex of Terbium-4-Sebacoylbis(1-phenyl-3-methyl-5-pyrazolonate) and Sodium Dibenzo-18-Crown-6: Synthesis, Crystal Structure, and Photophysical Properties

Abstract

On the basis of the novel heterocyclic beta-diketone, 4-sebacoylbis(1-phenyl-3-methyl-5-pyrazolone (H 2SbBP), three new lanthanide complexes Tb 2(SbBP) 3(H 2O) 2 ( 1), Gd 2(SbBP) 3(H 2O) 2 ( 2), and [Tb(SbBP) 2] [Na(DB18C6)H 2O] ( 3) have been synthesized and characterized by various spectroscopic techniques. The single-crystal X-ray diffraction analysis of 3 reveals that the complex crystallizes in the monoclinic space group C2/ c with a = 25.300(6) A, b = 19.204(7) A, c = 15.391(3) A, beta = 93.17(3) degrees , and V = 7466(4) A (3). The crystal structure of 3 is heterodinuclear and features a Tb (3+) center surrounded by two tetradentate bispyrazolone ligands in a somewhat distorted square-antiprismatic geometry. The Na (+) coordination environment is distorted hexagonal pyramidal and involves six oxygen atoms furnished by DB18C6 and one oxygen atom from a water molecule. The X-ray diffraction study of 3 also revealed an interesting 1D molecular ladder structure based on C-H/pi, intra- and intermolecular hydrogen-bonding interactions. The photophysical properties of 1 and 3 in solid state have been investigated, and the quantum yields and (5)D 4 lifetimes were found to be 4.82 +/- 0.01% and 18.13 +/- 0.82% and 1.11 +/- 0.01 and 2.82 +/- 0.02 ms, respectively.

Eu(III) and Tb(III) Complexes with the Nonsteroidal Anti-Inflammatory Drug Carprofen: Synthesis, Crystal Structure, and Photophysical Properties

“…45 The singlet ( 1 ππ*) energy level lies at about 309 nm (32 362 cm −1 ), as estimated from the higher wavelength edge of the UV−vis absorption of the ligand. 46,47 According to Reinhoudt's empirical rule, 48 the intersystem crossing process becomes effective when ΔE ( 1 ππ*− 3 ππ*) is at least 5000 cm −1 . The Inorganic Chemistry Article dx.doi.org/10.1021/ic501252x | Inorg.…”

Synthesis and Characterization of Phenylene‐bis‐pyrazolones and Nitrosation Derivatives

“…Some compounds, including two pyrazolone rings, have already been described, and they were obtained by the acylation of 1‐phenyl‐3‐methyl‐5‐pyrazolone with diacyl halides . Another interesting result is Raymond's synthesis of a tris ‐pyrazolone derivative .…”

3,5-Bis(benzyloxy)benzoic acid

“…For properties of dendrimer chemistry, see: Fré chet (2002). For the diverse applications of 3,5-bis(benzyloxy)benzoic acid and its benzoate derivatives, see: Sivakumar et al (2010); Remya et al (2008); Hawker & Fré chet (1992). For magnetic and luminiscent properties of lanthanide benzoates, see: Busskamp et al (2007).…”