Co-ligand tuning of MOF structural anisotropy for giant optical birefringence†
Svyatoslav A.
Povarov, 
*a
Pavel V.
Alekseevskiy,
ab
Dmitry I.
Pavlov,
c
Andrei S.
Potapov,
c
Irina D.
Yushina,
d
Valentin A.
Milichko
be
and
Alena N.
Kulakova
*b
*a
Pavel V.
Alekseevskiy,
ab
Dmitry I.
Pavlov,
c
Andrei S.
Potapov,
c
Irina D.
Yushina,
d
Valentin A.
Milichko
be
and
Alena N.
Kulakova
*b
Abstract
The control of the structural anisotropy of metal–organic frameworks (MOFs) by tuning their co-ligand composition to enhance the birefringence properties is demonstrated. A set of Cd-based MOFs with three co-ligands and H4TCPB were synthesised. We experimentally revealed the evolution of the MOF structural anisotropy and birefringence, which was equal to maximal Δn = 0.223 in experiments and Δn = 0.58 in theory within the visible spectral range.
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