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Towards absolute as...
Towards absolute asymmetric synthesis. Synthesis and crystal structure of stereochemically labile MCl2 (M = Co, Ni, Cu, Zn) complexes with diamine ligands
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- Johansson, A (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
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- Wingstrand, Erica (författare)
- KTH,Organisk kemi
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- Håkansson, Mikael, 1957 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
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(creator_code:org_t)
- Elsevier BV, 2005
- 2005
- Engelska.
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Ingår i: Inorganica Chimica Acta. - : Elsevier BV. - 0020-1693 .- 1873-3255. ; 358:12, s. 3293-3302
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Abstract
Ämnesord
Stäng
- In search for new conglomerates, seven stereochemically labile complexes between MCl2, (M = Co, Cu, Ni, Zn) and bidentate ligands, the commercially available N,N,N'-trimethylethane-1,2-diamine (trimeda) and the somewhat bulkier N-isopropyl,N,N',N'-trimethylethane-1,2-diamine (itmeda), have been synthesized and characterized using single crystal X-ray diffraction. The trimeda and itmeda ligands exhibit chirogenic nitrogen centers and may form chiral metal complexes that are candidates for total spontaneous resolution. Copper(II) chloride forms the dimeric meso complexes [{CuCl2(trimeda)}(2)](1) and [{CuCl2(itmeda) }(2)] (2), while [CoCl2(trimeda)(2)] (3) and [NiCl2(trimeda)(2)] (4) exhibit six-coordinate but chiral (R,R)- and (S,S)-complexes. Three examples of the chiral target complex, comprising four-coordinate stereochemically labile monomers, was successfully prepared, viz. [NiCl2(itmeda)] (5), [ZnCl2(itmeda)] (6), and [CoCl2(itmeda)] (7). In all seven complexes, the lambda-conformation of the five-membered trimeda-metal chelate ring corresponds to the (S)-configuration at nitrogen, and vice versa. Supramolecular interactions in 3 and 4 form hydrogen-bonded heterochiral ribbons. However, crystals of 5-7 display homochiral interactions resulting in polar phases. Weak CH-Cl interactions in 5 and 6 form homochiral layers. In 7, interactions form homochiral helices along the a-axis. (c) 2005 Elsevier B.V. All rights reserved.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- chiral
- conglomerate
- crystal structure
- metal(II) chloride
- N-chirogenic
- GRIGNARD-REAGENTS
- AUTOCATALYSIS
- PRECURSORS
- CHIRALITY
- chiral
- Chemistry
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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