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391 results on '"Zavalij P"'

112. Crystal structure of a new polymorph of iodic acid, δ-HIO3, from powder diffraction

Author

Wu, Tao, Zavalij, Peter Y., and Zachariah, Michael R.

Abstract

A new polymorph of iodic acid, δ-HIO3, synthesized via aerosol spray pyrolysis was characterized with powder X-ray diffraction and its crystal structure was solved. We find that a previously misidentified phase of I4O9hydrate is in fact a new polymorph of HIO3, which crystalizes in the orthorhombic space group P212121.

Published
2017
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113. Electronic Nature of New Ir(III) Complexes: Linear Spectroscopic and Nonlinear Optical Properties

Author

Zhao, Peng, Tofighi, Salimeh, O’Donnell, Ryan M., Shi, Jianmin, Zavalij, Peter Y., Bondar, Mykhailo V., Hagan, David J., and Van Stryland, Eric W.

Abstract

Comprehensive investigations of the linear and nonlinear optical properties of new Ir(III) complexes [Ir(pbt)2(dbm)] (1), [Ir(pbt)2(dmac)] (2), and [Ir(pbt)2(minc)] (3) (pbt = 2-phenylbenzothiazole; dbm = dibenzoyl methane; dmac = (1E,4Z,6E)-1,7-bis(4-(dimethylamino)phenyl)-5-hydroxyhepta-1,4,6-trien-3-one; minc = (1E,4Z,6E)-5-hydroxy-1,7-bis(1-methyl-1H-indol-3-yl)hepta-1,4,6-trien-3-one) are reported, including photostability, two-photon absorption, and femtosecond transient absorption spectroscopy. The steady-state and time-resolved spectral properties of 1–3revealed the electronic nature of the absorption bands, and photoluminescence emission of 2and 3shows both fluorescence and phosphorescence processes occurring simultaneously in liquid solution at room temperature. This unusual behavior of 2and 3can be explained by a dual-minimum potential surface of the excited electronic state resulting in two independent fluorescence and phosphorescence emission channels. The degenerate 2PA spectra of 1–3were obtained by open aperture Z-scans with a femtosecond laser, and maxima values of 2PA cross sections up to ∼350 GM were observed. Ultrafast relaxation processes of 1–3were investigated by femtosecond transient absorption, and the characteristic times for triplet formation were determined to be <500 fs for 1and ∼2 ps for 2and 3in a nonpolar medium.

Published
2017
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117. Synthesis and Characterization of the {Si(NHCH2CH2NH)3[Mo(CO)3]2}2–Complex Comprising the Si(NHCH2CH2NH)32–Octahedron

Author

Wang, Yi, DeCarlo, Samantha, Wang, Luning, Stevens, Lauren, Chen, Fu, Zavalij, Peter, and Eichhorn, Bryan

Abstract

Reactions of K12Si17with the low-valent transition-metal complex Mo(CO)3(C7H8) in ethylenediamine/toluene solutions in the presence of 2,2,2-cryptand yield the {Si(NHCH2CH2NH)3[Mo(CO)3]2}2–dianion, which contains an octahedral Si(NHCH2CH2NH)32–subunit. The SiN6core comprises a rare example of a doubly deprotonated ethylenediame ligand in a coordination complex and is also the first structurally characterized example of a homoleptic Si(N∩N)3trischelate. Its structure and spectroscopic properties are described.

Published
2019
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