Journal Article

PUBDB-2026-01699

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png L-threo-D-galacto-Octitol: a curious non-classical order–disorder polytype with an 88 Å axis

Biedermann, N. ; Standfest, C. ; Stanetty, C.Extern* ; Stoeger, B. (Corresponding author)Extern* ; Virovets, A. ; Wolflehner, T.Extern*

2026
Wiley-Blackwell Oxford [u.a.]

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Please use a persistent id in citations: doi:10.1107/S2052520626004907  doi:10.3204/PUBDB-2026-01699

Abstract: GalC8 [l-threo-d-galacto-octitol, systematic name (2S,3R,4R,5R,6R,7S)-octane-1,2,3,4,5,6,7,8-octol] crystallizes with a pseudo-tetragonal lattice featuring a long (~88 Å) c axis. The bulk of the structure possesses P43212 (Z = 1) pseudo-symmetry, whereby molecules are arranged linearly with eight molecules in a translation period, thus explaining the long c axis. According to this pseudo-symmetry, adjacent molecules are alternately related by 21 screw rotations (in <100> directions) and twofold rotations (in <110> directions). Due to an asymmetrical hydrogen-bonding network, symmetry is broken in the vicinity of the twofold rotation axes, leading to an overall P21 (Z0 = 4) space-group symmetry. The lost symmetry is retained as a twin operation. The structure can be classified as a `non-classical' OD polytype, in the sense that there are nonequivalent layer contacts, yet all members of the polytype family are locally equivalent. The main polytype is not of a maximum degree of order (MDO) and can be described as an alternation of fragments of the two MDO polytypes with P43 and P212121 symmetry, respectively.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20231300 EC (I-20231300-EC) (I-20231300-EC)

Experiment(s):

1. PETRA Beamline P24 (PETRA III)

Appears in the scientific report 2026

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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