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Coordination studies of the ligand series RNH center dot CO center dot(CH2)(n)center dot CO center dot NHR where R = alkyl, aryl; O = O, S and n = 0,1,2. Part 6. Crystal structures and bonding considerations of the ligands MeNH center dot CO center dot CH2 center dot CO center dot NHMe (L-1), MeNH center dot CO center dot CH2 center dot CH2 center dot CO center dot NHMe (L-4), MeNH center dot CS center dot CH2 center dot CS center dot NHMe (L-5) and the Sn-IV complexes SnBr4L1 center dot L-1, SnBr4L2 center dot 2THF and SnBr4L3 center dot MeCN where L-2 = (C3H7NH)-C-i center dot CO center dot CH2 center dot CO center dot(NHC3H7)-C-i and L-3 = (C3H7NH)-C-i center dot CS center dot CH2 center dot CS center dot(NHC3H7)-C-i
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UNSPECIFIED (1998) Coordination studies of the ligand series RNH center dot CO center dot(CH2)(n)center dot CO center dot NHR where R = alkyl, aryl; O = O, S and n = 0,1,2. Part 6. Crystal structures and bonding considerations of the ligands MeNH center dot CO center dot CH2 center dot CO center dot NHMe (L-1), MeNH center dot CO center dot CH2 center dot CH2 center dot CO center dot NHMe (L-4), MeNH center dot CS center dot CH2 center dot CS center dot NHMe (L-5) and the Sn-IV complexes SnBr4L1 center dot L-1, SnBr4L2 center dot 2THF and SnBr4L3 center dot MeCN where L-2 = (C3H7NH)-C-i center dot CO center dot CH2 center dot CO center dot(NHC3H7)-C-i and L-3 = (C3H7NH)-C-i center dot CS center dot CH2 center dot CS center dot(NHC3H7)-C-i. POLYHEDRON, 17 (19). pp. 3291-3303. ISSN 0277-5387
Full text not available from this repository.Abstract
Crystal structures of the ligands MeNH . CO . CH2. CO . NHMe, MeNH . CO . CH2. CH2. CO . NHMe and MeNH . CS . CH2. CS . NHMe have been determined by X-ray diffraction studies. The framework C-C, C-N, and C=O/C=S bond distances and the associated interbond angles are all closely similar and the packing of these molecules is dominated by intermolecular hydrogen bonding of the type N-H ... O=C and, to a lesser extent, N-H ... S=C. For means of comparison the bond parameters of all the structurally characterised related ligands belonging to the N,N'-disubstituted series RNH . CO (CH2)(n). CO . NHR where R = alkyl; O = O, S and n = O, 1, 2 are listed and a general overview of the characteristics of such ligands including conformational variations is provided. Structural characterisation (X-ray diffraction) of SnBr4 (MeNH . CO . CH2. CO . NHMe). MeNH . CO . CH2. CO . NHMe, SnBr4((PrNH)-Pr-i . CO . CH2. CO . (NHPr)-Pr-i). 2THF and SnBr4(iPrNH . CS . CH2CS . (NHPr)-Pr-i). MeCN reveals bidentate chelate ligand attachment for these six coordinate mononuclear cis-octahedral Sn(IV) complexes. In all three structures, the NH groups are involved in intermolecular hydrogen bonding being linked either to C=O/C=S groups of adjacent molecules, or solvent molecule(s) entrapped in the lattice and/or halogen atom(s) of a neighbouring SnBr4 moiety. The general range of Sn-Br distances is 2.504(3)-2.565(12) Angstrom excluding those halogen atoms directly involved in N-H ... Br-Sn interactions. These several types of intermolecular hydrogen bonding are viewed as a direct cause of ring puckering in the chelated rings approximating to a chair conformation. (C) 1998 Elsevier Science Ltd. All rights reserved.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry |
| Journal or Publication Title: | POLYHEDRON |
| Publisher: | PERGAMON-ELSEVIER SCIENCE LTD |
| ISSN: | 0277-5387 |
| Date: | 1998 |
| Volume: | 17 |
| Number: | 19 |
| Number of Pages: | 13 |
| Page Range: | pp. 3291-3303 |
| Publication Status: | Published |
| URI: | http://wrap.warwick.ac.uk/id/eprint/15174 |
Data sourced from Thomson Reuters' Web of Knowledge
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