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SUMMARY:Investigating negative thermal expansion in aliphatic metal-organi
 c frameworks
DTSTART;VALUE=DATE-TIME:20211125T072000Z
DTEND;VALUE=DATE-TIME:20211125T072100Z
DTSTAMP;VALUE=DATE-TIME:20260306T091003Z
UID:indico-contribution-4216@events01.synchrotron.org.au
DESCRIPTION:Speakers: Celia Chen (The University of Sydney)\nNegative ther
 mal expansion (NTE) involves the unconventional behaviour of material cont
 raction upon heating and has been observed in some metal organic framework
 s (MOFs). Investigations into the mechanism governing NTE are highly impor
 tant for practical applications for when it is undesirable for materials t
 o expand upon heating. Previous investigations focused on aromatic and sin
 gle component frameworks\, our goal is to expand into the realm of aliphat
 ic linkers such as cubane-1\,4-dicarboxylate (1\,4-cdc) and bicyclo[1.1.1]
 pentane-1\,3-dicarboxylate (1\,3-pdc)\, which may introduce unencountered 
 dynamic motions.[1] \n\nSingle-component aliphatic MOFs\, 3DL-MOF-1 ([Zn4O
 (1\,3-pdc)3]) and CUB-5 ([Zn4O(1\,4-cdc)3]) were explored using powder dif
 fraction (PD) techniques.[2] The aliphatic MOFs demonstrated enhanced NTE\
 , in comparison to its aromatic MOF-5 analogue . Investigations on the hos
 t-guest effects on NTE behaviour[3]  were explored using neutron PD at the
  ACNS by charging 3DL-MOF-1 with CO2 guest molecules. Successful NTE quenc
 hing was achieved at higher CO2 loading.\n\nTo extend our understanding of
  aliphatic influences on NTE behaviour\, we study a series of moisture sta
 ble multicomponent frameworks.[4]  Using synchrotron PD and single crystal
  X-ray diffraction we investigate the NTE behaviour of quaternary MOFs (th
 ree linkers and one node) by varying the aliphatic linker in each system. 
 We hope to identify the key characteristics of aliphatic linkers that dict
 ates NTE behaviour. \n\n\n\n[1]	J. Perego et al.\, Nature Chemistry 2020\,
  12\, 845.\n[2]	L. K. Macreadie et al.\, ACS Applied Materials & Interface
 s 2021\, 13\, 30885.\n[3]	J. E. Auckett et al.\, Nature communications 201
 8\, 9\, 1.\n[4]	L. K. Macreadie\, et al.\, Angewandte Chemie International
  Edition 2020\, 59\, 6090.\n\nhttps://events01.synchrotron.org.au/event/14
 6/contributions/4216/
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4216/
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