, Volume 24, Issue 5, pp 2205–2213 | Cite as

Bistable thermo-chromic and magnetic spin crossover microcrystals embedded in nata de coco bacterial cellulose biofilm

  • Djulia OnggoEmail author
  • Irma Mulyani
  • Francisco Javier Valverde-Muñoz
  • José Antonio RealEmail author
  • Gabor Molnar
Original Paper


Bacterial cellulose (BC) is a unique biomaterial with interesting physico-chemical properties and potential technological applications (i.e. removal of heavy metals from wastewater, manufacturing electrical and electronic devices, papermaking and biomedical technologies among others). In this work, we describe the growth of well formed micro-crystals of the one-dimensional spin crossover (SCO) compound {[Fe(Htrz)2(trz)](BF4)}n in a matrix of BC. The thermal dependence of the magnetic, optical, calorimetric and vibrational properties associated with the SCO properties of the resulting composite material have been investigated and compare well with those of the bulk SCO. The SCO-BC composite films display reversible thermomagnetic (diamagnetic ↔ paramagnetic) and thermochromic bistability (purple ↔ pale-yellow) determined by a well-defined hysteresis in the temperature range ca. 345–380 K where these properties depend on the history of the sample (memory effect).


Bacterial cellulose Iron(II) complex Spin crossover Composite material Environmental responsive materials 



D.O. wish to express special thanks to Prof. H. A. Goodwin for giving inspiration in exploring SCO and for Research funding ITB No. 254/I.1.C01/PL/2011. J.A.R. thanks the Spanish Ministerio de Economía y Competitividad (MINECO) and FEDER funds (CTQ2013-46275-P and CTQ2016-78341-P and Unidad de Excelencia María de Maeztu (MDM-2015-0538) and Generalitat Valenciana (PROMETEO/2016/147). F.J.V.M. thanks the MINECO for a predoctoral FPI fellowship.

Supplementary material

10570_2017_1248_MOESM1_ESM.docx (1.2 mb)
Supplementary material 1 (DOCX 1267 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Djulia Onggo
    • 1
    Email author
  • Irma Mulyani
    • 1
  • Francisco Javier Valverde-Muñoz
    • 2
  • José Antonio Real
    • 2
    Email author
  • Gabor Molnar
    • 3
  1. 1.Inorganic and Physical Chemistry Research Group, Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungBandungIndonesia
  2. 2.Institut de Ciencia Molecular (ICMol)Universitat de ValènciaPaternaSpain
  3. 3.LCCCNRS and Université de Toulouse (UPS, INP)ToulouseFrance

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