Na 2EuAs 2S 5, NaEuAsS 4, and Na 4Eu(AsS 4) 2: Controlling the valency of arsenic in polysulfide fluxes

Tarun K. Bera, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The reactivity of europium with As species in Lewis basic alkali-metal polysulfide fluxes was investigated along with compound formation and the As 3+/As 5+ interplay vis-à-vis changes in the flux basicity. The compound Na 2EuAs 2S 5 containing trivalent As 3+ is stabilized from an arsenic-rich polysulfide flux. It crystallizes in the monoclinic centrosymmetric space group P2 1/c. Na 2EuAs 2S 5 has [As 2S 5] 4- units, built of corner sharing AsS 3 pyramids, which are coordinated to Eu 2+ ions to give a two-dimensional (2D) layered structure. A sodium polysulfide flux with comparatively less arsenic led to the As 5+ containing compounds NaEuAsS 4 (orthorhombic, Ama2) and Na 4Eu(AsS 4) 2 (triclinic, P1) depending on Na 2S/S ratio. The NaEuAsS 4 and Na 4Eu(AsS 4) 2 have a three-dimensional (3D) structure built of [AsS 4] 3- tetrahedra coordinated to Eu 2+ ions. All compounds are semiconductors with optical energy gaps of ∼2 eV.

Original languageEnglish
Pages (from-to)4293-4299
Number of pages7
JournalInorganic Chemistry
Volume51
Issue number7
DOIs
Publication statusPublished - Apr 2 2012

Fingerprint

polysulfides
Arsenic
arsenic
Fluxes
Ions
Europium
Alkali Metals
Alkalinity
europium
pyramids
tetrahedrons
alkali metals
ions
Energy gap
reactivity
Sodium
sodium
Semiconductor materials
polysulfide

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Na 2EuAs 2S 5, NaEuAsS 4, and Na 4Eu(AsS 4) 2 : Controlling the valency of arsenic in polysulfide fluxes. / Bera, Tarun K.; Kanatzidis, Mercouri G.

In: Inorganic Chemistry, Vol. 51, No. 7, 02.04.2012, p. 4293-4299.

Research output: Contribution to journalArticle

@article{8676fa4ac4ea4a80a0c192b0901e7ec2,
title = "Na 2EuAs 2S 5, NaEuAsS 4, and Na 4Eu(AsS 4) 2: Controlling the valency of arsenic in polysulfide fluxes",
abstract = "The reactivity of europium with As species in Lewis basic alkali-metal polysulfide fluxes was investigated along with compound formation and the As 3+/As 5+ interplay vis-{\`a}-vis changes in the flux basicity. The compound Na 2EuAs 2S 5 containing trivalent As 3+ is stabilized from an arsenic-rich polysulfide flux. It crystallizes in the monoclinic centrosymmetric space group P2 1/c. Na 2EuAs 2S 5 has [As 2S 5] 4- units, built of corner sharing AsS 3 pyramids, which are coordinated to Eu 2+ ions to give a two-dimensional (2D) layered structure. A sodium polysulfide flux with comparatively less arsenic led to the As 5+ containing compounds NaEuAsS 4 (orthorhombic, Ama2) and Na 4Eu(AsS 4) 2 (triclinic, P1) depending on Na 2S/S ratio. The NaEuAsS 4 and Na 4Eu(AsS 4) 2 have a three-dimensional (3D) structure built of [AsS 4] 3- tetrahedra coordinated to Eu 2+ ions. All compounds are semiconductors with optical energy gaps of ∼2 eV.",
author = "Bera, {Tarun K.} and Kanatzidis, {Mercouri G}",
year = "2012",
month = "4",
day = "2",
doi = "10.1021/ic202781c",
language = "English",
volume = "51",
pages = "4293--4299",
journal = "Inorganic Chemistry",
issn = "0020-1669",
publisher = "American Chemical Society",
number = "7",

}

TY - JOUR

T1 - Na 2EuAs 2S 5, NaEuAsS 4, and Na 4Eu(AsS 4) 2

T2 - Controlling the valency of arsenic in polysulfide fluxes

AU - Bera, Tarun K.

AU - Kanatzidis, Mercouri G

PY - 2012/4/2

Y1 - 2012/4/2

N2 - The reactivity of europium with As species in Lewis basic alkali-metal polysulfide fluxes was investigated along with compound formation and the As 3+/As 5+ interplay vis-à-vis changes in the flux basicity. The compound Na 2EuAs 2S 5 containing trivalent As 3+ is stabilized from an arsenic-rich polysulfide flux. It crystallizes in the monoclinic centrosymmetric space group P2 1/c. Na 2EuAs 2S 5 has [As 2S 5] 4- units, built of corner sharing AsS 3 pyramids, which are coordinated to Eu 2+ ions to give a two-dimensional (2D) layered structure. A sodium polysulfide flux with comparatively less arsenic led to the As 5+ containing compounds NaEuAsS 4 (orthorhombic, Ama2) and Na 4Eu(AsS 4) 2 (triclinic, P1) depending on Na 2S/S ratio. The NaEuAsS 4 and Na 4Eu(AsS 4) 2 have a three-dimensional (3D) structure built of [AsS 4] 3- tetrahedra coordinated to Eu 2+ ions. All compounds are semiconductors with optical energy gaps of ∼2 eV.

AB - The reactivity of europium with As species in Lewis basic alkali-metal polysulfide fluxes was investigated along with compound formation and the As 3+/As 5+ interplay vis-à-vis changes in the flux basicity. The compound Na 2EuAs 2S 5 containing trivalent As 3+ is stabilized from an arsenic-rich polysulfide flux. It crystallizes in the monoclinic centrosymmetric space group P2 1/c. Na 2EuAs 2S 5 has [As 2S 5] 4- units, built of corner sharing AsS 3 pyramids, which are coordinated to Eu 2+ ions to give a two-dimensional (2D) layered structure. A sodium polysulfide flux with comparatively less arsenic led to the As 5+ containing compounds NaEuAsS 4 (orthorhombic, Ama2) and Na 4Eu(AsS 4) 2 (triclinic, P1) depending on Na 2S/S ratio. The NaEuAsS 4 and Na 4Eu(AsS 4) 2 have a three-dimensional (3D) structure built of [AsS 4] 3- tetrahedra coordinated to Eu 2+ ions. All compounds are semiconductors with optical energy gaps of ∼2 eV.

UR - http://www.scopus.com/inward/record.url?scp=84859222975&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859222975&partnerID=8YFLogxK

U2 - 10.1021/ic202781c

DO - 10.1021/ic202781c

M3 - Article

C2 - 22414216

AN - SCOPUS:84859222975

VL - 51

SP - 4293

EP - 4299

JO - Inorganic Chemistry

JF - Inorganic Chemistry

SN - 0020-1669

IS - 7

ER -