New sarcosine-metal halide complexes related to the ferroelectric TSCC

Rebecca Clulow, Philip Lightfoot*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
2 Downloads (Pure)

Abstract

There are relatively few sarcosine metal halide complexes. Of these, tris sarcosine calcium chloride (TSCC) ((C3NO2H7)3CaCl2) stands out as an unusual example of a molecular ferroelectric. Here we report the syntheses of eight new related sarcosine-metal halide complexes by slow evaporation. The newly reported materials can be categorised into four different structure types, viz. 3:1 complexes such as (C3NO2H7)3CaBr2, hydrated 3:1 complexes such as (C3NO2H7)3MnI2.2H2O, hydrated 2:1 complexes such as (C3NO2H7)2MgCl2.2H2O, and a 4:1 complex (C3NO2H7)4CaI2.2H2O. The crystal structures of all examples have been determined at multiple temperatures but no evidence is found for any structural transitions to polar phases, either by single crystal X-ray diffraction or by differential scanning calorimetry. The specific compositional reasons behind the apparently unique ferroelectric behaviour of TSCC therefore remain to be ascertained.
Original languageEnglish
Pages (from-to)4012-4019
Number of pages8
JournalCrystEngComm
Volume20
Issue number28
Early online date25 Jun 2018
DOIs
Publication statusPublished - 28 Jul 2018

Keywords

  • Trissarcosine calcium-chloride
  • Dielectric-properties
  • Crystal-structure
  • Pressure
  • Temperature
  • Dependence
  • Phase

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