Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Anna Kornienko is active.

Publication


Featured researches published by Anna Kornienko.


Applied Physics Letters | 2006

Infrared fluorescence and optical gain characteristics of chalcogenide-bound erbium cluster-fluoropolymer nanocomposites

G. A. Kumar; Richard Riman; Santanu Banerjee; Anna Kornienko; John G. Brennan; S. Chen; Dennis W. Smith; John Ballato

The infrared fluorescence and optical gain characteristics of optically transparent nanocomposites consisting of (THF)14Er10S6Se12I6 (“Er10”) or (DME)2Er(SC6F5)3 (“Er1”) clusters dissolved in a transparent hexafluoroisopropyl (6F) variant of a perfluorocyclobutyl (PFCB)-based fluoropolymer are reported. Under excitation at 980 nm, fluorescence was observed at 1540 nm from both Er10 and Er1 with a 3dB bandwidth of 96 and 60 nm, respectively. The maximum gain computed for Er10 and Er1 was 2.8 and 0.021dB∕cm, respectively. The corresponding threshold pump powers for Er10 and Er1 were calculated to be 1.7 and 0.2 mW, respectively. These computations are consistent with gain characteristics measured by the amplified spontaneous emission technique and suggest that these nanocomposites are promising materials for active optical devices.


Acta Crystallographica Section C-crystal Structure Communications | 2009

Trans influence in a mer-octahedral triiodidolanthanide: triiodidotris(tetrahydrofuran-kappaO)ytterbium(III).

Thomas J. Emge; Anna Kornienko; John G. Brennan

The structure of the six-coordinate title complex, [YbI(3)(C(4)H(8)O)(3)], is the first mer-octahedral form of an LnI(3)L(3) lanthanide (Ln) compound with neutral L ligands, and is closely related to that of several of the seven-coordinate LnX(3)L(4) series of compounds, where X = Cl, Br or I and L = tetrahydrofuran (THF), isopropanol, pyridine or water. A structural trans effect can be assigned to YbI(3)(THF)(3), in contrast to the LnX(3)L(4) compounds, where steric and crystal packing effects are significant. The Yb-I bond lengths are 2.9543 (4) and 2.9151 (6) A for I trans and cis to I, respectively, and the Yb-O bond lengths are 2.299 (5) and 2.251 (3) A for O trans and cis to I, respectively. The crystal packing allows for six contact distances as weak C-H...I interactions in the range 3.10-3.24 A. The title molecule has a crystallographic twofold axis passing through a THF O atom, the trans I atom and the Yb atom.


Inorganic Chemistry | 2016

Thorium Compounds with Bonds to Sulfur or Selenium: Synthesis, Structure, and Thermolysis

David Rehe; Anna Kornienko; Thomas J. Emge; John G. Brennan

Thorium chalcogenolates Th(ER)4 (E = S, Se; R = Ph, C6F5) form pyridine complexes with a variety of coordination numbers. Four compounds, (py)4Th(SPh)4, (py)3Th(SePh)4, (py)3Th(SC6F5)4, and (py)4Th(SeC6F5)4, have been isolated and characterized by spectroscopic methods and low-temperature single crystal X-ray diffraction. Two of the products, (py)4Th(SPh)4 and (py)4Th(SeC6F5)4, have classic eight coordinate A4B4 square-antiprism geometries. The SePh compound is the only seven coordinate (4Se, 3N) product, and the fluorinated thiolate is distinctive in that the structure contains two dative interactions between Th and fluoride, to give a nine coordinate (3N, 4S, 2F) structure. The EPh compounds decompose thermally to give ThE2 and EPh2, while the fluorinated compounds give primarily ThF4, E2(C6F5)2, and E(C6F5)2.


Inorganic Chemistry | 2018

Efficient NIR Emission from Nd, Er, and Tm Complexes with Fluorinated Selenolate Ligands

Wen Wu; Xin Zhang; Anna Kornienko; G.A. Kumar; Dechao Yu; Thomas J. Emge; Richard E. Riman; John G. Brennan

(DME)2Ln(SeC6F5)3 (Ln = Nd, Er, Tm) can be isolated in high yield by reductive cleavage of the Se-Se bond in (SeC6F5)2 with elemental Ln in DME. All three Ln compounds are isostructural, with 8 coordinate Ln bound to four O from DME, three terminally bound Se(C6F5), and a dative bond from an arene fluoride to a fluorine at the ortho position of one selenolate. Emission measurements indicate that these compounds are bright NIR sources.


Inorganic Chemistry | 2017

Tetrametallic Thorium Compounds with Th4E4 (E = S, Se) Cubane Cores

Matthew A. Stuber; Anna Kornienko; Thomas J. Emge; John G. Brennan

Tetrametallic thorium compounds with a Th4E4 core (E = S, Se) having a distorted cubane structure can be prepared by ligand-based reductions of elemental E with thorium chalcogenolates, prepared by in situ oxidation of Th metal with a 3:1 mixture of PhEEPh and F5C6EEC6F5. Four compounds, (py)8Th4S4(μ2-SPh)4(SC6F5)4, (py)8Th4S4(μ2-SPh)4(SeC6F5)4, (py)8Th4Se4(μ2-SePh)4(SeC6F5)4, and (py)8Th4Se4(μ2-SePh)4(SC6F5)4, were isolated and characterized by NMR spectroscopy and X-ray diffraction. These compounds clearly demonstrate the chemical impact of ring fluorination, with the less-nucleophilic EC6F5 ligands occupying the terminal binding sites and the EPh ligands bridging two metal centers. For this series of compounds, crystal packing and intermolecular π···π and H-bonding interactions result in a consistent motif and crystallization in a body-centered tetragonal unit cell. Solution-state 77Se NMR spectroscopy reveals that the solid-state structures are maintained in pyridine.


Journal of the American Chemical Society | 2005

Lanthanide Clusters with Internal Ln Ions: Highly Emissive Molecules with Solid-State Cores

Anna Kornienko; Thomas J. Emge; G. Ajith Kumar; Richard E. Riman; John G. Brennan


Journal of the American Chemical Society | 2005

Heterometallic chalcogenido clusters containing lanthanides and main group metals: emissive precursors to ternary solid-state compounds.

Anna Kornienko; Santanu Banerjee; G. Ajith Kumar; Richard E. Riman; Thomas J. Emge; John G. Brennan


Chemistry of Materials | 2005

Chalcogenide-Bound Erbium Complexes: Paradigm Molecules for Infrared Fluorescence Emission

G. A. Kumar; Richard E. Riman; L. A. Diaz Torres; O. Barbosa Garcia; Santanu Banerjee; Anna Kornienko; John G. Brennan


Inorganic Chemistry | 2004

Heterometallic Lanthanide Group 12 Metal Iodides

Anna Kornienko; Thomas J. Emge; John G. Brennan


Journal of the American Chemical Society | 2001

Chalcogen-Rich Lanthanide Clusters: Cluster Reactivity and the Influence of Ancillary Ligands on Structure

Anna Kornienko; Thomas J. Emge; John G. Brennan

Collaboration


Dive into the Anna Kornienko's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge