Polymorphism and optical properties in [NH4][InSe2]

Sarah Jane Ewing, David I Woodward, Anthony Vivian Powell, Paz Vaqueiro

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The solvothermal synthesis and characterization of two indium selenides with stoichiometry [NH4][InSe2] is described. Yellow [NH4][InSe2] (1), which exhibits a layered structure, was initially prepared in an aqueous solution of trans-1,4-diaminocyclohexane, and subsequently using a concentrated ammonia solution. A red polymorph of one-dimensional character, [NH4][InSe2] (2), was obtained using 3,5-dimethylpyridine as solvent. [NH4][InSe2] (1) crystallizes in the non-centrosymmetric space group Cc (a=11.5147(6), b=11.3242(6), c=15.9969(9) Å and ß=100.354(3)°). The structural motif of the layers is the In4Se10 adamantane unit, composed of four corner-linked InSe4 tetrahedra. These units are linked by their corners, forming [InSe2]- layers which are stacked back to back along the c-direction, and interspaced by [NH4]+cations. The one-dimensional polymorph, (2), crystallizes in the tetragonal space group, I4/mcm (a=8.2519(16), c=6.9059 (14) Å). This structure contains infinite chains of edge-sharing InSe4 tetrahedra separated by [NH4]+ cations.
Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalJournal of Solid State Chemistry
Volume204
Early online date30 May 2013
DOIs
Publication statusPublished - Aug 2013

Keywords

  • Solvothermal synthesis
  • Crystal structure
  • Indium selenides
  • Optical properties
  • TERNARY THALLIUM CHALCOGENIDES
  • TEMPERATURE PHASE-TRANSITIONS
  • LAYERED SINGLE-CRYSTALS
  • ONE-DIMENSIONAL INDIUM
  • SOLVOTHERMAL SYNTHESIS
  • 2ND-HARMONIC GENERATION
  • TLINS2 CRYSTALS
  • X-RAY
  • SELENIDE
  • TLGASE2

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