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ID 58596
Author
Matsushima, Misaki Graduate School of Natural Science and Technology, Okayama University
Wada, Koki Graduate School of Natural Science and Technology, Okayama University
Takahara, Kazuma Graduate School of Natural Science and Technology, Okayama University
Sunatsuki, Yukinari Graduate School of Natural Science and Technology, Okayama University
Suzuki, Takayoshi Graduate School of Natural Science and Technology, Okayama University ORCID Kaken ID publons researchmap
Abstract
Crystal structures and crystallisation behaviours of a series of first-row transition-metal(II) complexes bearing 1,1,1-tris[2-aza-3-(imidazol-4-yl)prop-2-enyl]ethane (H3L), [MII(H3L)]Cl(ClO4) (M = Mn, Fe, Co, Ni and Zn) were examined. These compounds crystallise in an orthorhombic crystal system with a non-enantiogenic (Sohncke) space group P212121, resulting in spontaneous resolution of the chiral complex cations. Hydrogen bonds between the imidazole N–H atoms in the tripodal ligand and chloride anions give enantiomorphic crystals with a homochiral three-dimensional network structure. In order to verify the spontaneous resolution of these compounds, solid-state circular dichroism spectra of the resulting single crystals were measured (KBr disk method). Unexpectedly, the observed spectra indicated that imbalanced formation of the enantiomorphic crystals (i.e., left-handed Λ-form vs. right-handed Δ-form complex cations) in all cases. Moreover, in the cases of NiII and ZnII compounds, predominant enantiomorphic crystals formed by spontaneous resolution were always the same (in at least ten of our recrystallisation experiments). These observations suggest that there is a certain (but as yet unknown) factor that affects the predominant deposition of either enantiomorphic crystal when spontaneous resolution takes place from a solution of a racemic mixture in which rapid racemisation occurs.
Note
This fulltext is available in Dec. 2020.
Published Date
2019-12-06
Publication Title
CrystEngComm
Volume
volume22
Issue
issue3
Publisher
Royal Society of Chemistry
Start Page
458
End Page
466
ISSN
14668033
NCID
AA12001866
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
File Version
author
DOI
Web of Science KeyUT
Related Url
isVersionOf https://doi.org/10.1039/C9CE01864F
Funder Name
Ministry of Education, Culture, Sports, Science and Technology
助成番号
23655052
18K05146