A structural investigation of anion-triazole interactions: observation of “?-Pockets” and “?-Sandwiches”
A structural investigation of anion-triazole interactions: observation of “?-Pockets” and “?-Sandwiches”
Eight mononuclear nickel(II) complexes of the ligands 4-amino-3,5-di(2-pyridyl)-1,2,4-triazole (adpt) and 4-pyrrolyl-3,5-di(2-pyridyl)-1,2,4-triazole (pldpt) with the anions ClO(4), BF(4), PF(6) and SbF(6) have been prepared. In all cases the metal/ligand ratio is 1:3, and the complexes are of the form [NiL(3)](A)(2)center dot solvents where L = adpt or pldpt and A = one of the aforementioned anions. Five of these. complexes have been structurally characterized by X-ray crystallography: four of these contain pldpt and strong anion-pi interactions are observed, with two motifs present in all four structures. One of the anions occupies a "pi-pocket" formed by two coordinated triazole rings and one coordinated pyridine ring. The other anion only interacts with one triazole ring, which is involved in the pocket around the first anion, such that the triazole ring is "sandwiched" by two anions. Surprisingly, in all four of these complexes, the two triazole, centroid center dot center dot center dot anion distances in the anion-triazole-anion interactions [2.917(7)-3.005(10) angstrom] are significantly shorter than in any of the other types of triazole-anion interactions [3.164(5)-3.456(9) angstrom].
coordination compounds, pi interactions, supramolecular chemistry, triazoles, n ligands
1172-1180
White, Nicholas G.
ebcbc4ca-7e2c-4af7-820d-366956f64762
Kitchen, Jonathan A.
3999f5cb-d53e-4c51-b750-627bd2a1b9b6
Brooker, Sally
2ee9681a-3ff7-41be-88c5-681f66b953ef
March 2009
White, Nicholas G.
ebcbc4ca-7e2c-4af7-820d-366956f64762
Kitchen, Jonathan A.
3999f5cb-d53e-4c51-b750-627bd2a1b9b6
Brooker, Sally
2ee9681a-3ff7-41be-88c5-681f66b953ef
White, Nicholas G., Kitchen, Jonathan A. and Brooker, Sally
(2009)
A structural investigation of anion-triazole interactions: observation of “?-Pockets” and “?-Sandwiches”.
European Journal of Inorganic Chemistry, 2009 (9), .
(doi:10.1002/ejic.200801260).
Abstract
Eight mononuclear nickel(II) complexes of the ligands 4-amino-3,5-di(2-pyridyl)-1,2,4-triazole (adpt) and 4-pyrrolyl-3,5-di(2-pyridyl)-1,2,4-triazole (pldpt) with the anions ClO(4), BF(4), PF(6) and SbF(6) have been prepared. In all cases the metal/ligand ratio is 1:3, and the complexes are of the form [NiL(3)](A)(2)center dot solvents where L = adpt or pldpt and A = one of the aforementioned anions. Five of these. complexes have been structurally characterized by X-ray crystallography: four of these contain pldpt and strong anion-pi interactions are observed, with two motifs present in all four structures. One of the anions occupies a "pi-pocket" formed by two coordinated triazole rings and one coordinated pyridine ring. The other anion only interacts with one triazole ring, which is involved in the pocket around the first anion, such that the triazole ring is "sandwiched" by two anions. Surprisingly, in all four of these complexes, the two triazole, centroid center dot center dot center dot anion distances in the anion-triazole-anion interactions [2.917(7)-3.005(10) angstrom] are significantly shorter than in any of the other types of triazole-anion interactions [3.164(5)-3.456(9) angstrom].
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e-pub ahead of print date: 26 February 2009
Published date: March 2009
Keywords:
coordination compounds, pi interactions, supramolecular chemistry, triazoles, n ligands
Organisations:
Organic Chemistry: Synthesis, Catalysis and Flow
Identifiers
Local EPrints ID: 352495
URI: http://eprints.soton.ac.uk/id/eprint/352495
ISSN: 1434-1948
PURE UUID: 0cc3187f-a6d5-4618-ad6f-dd18254ccd9b
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Date deposited: 14 May 2013 14:04
Last modified: 14 Mar 2024 13:53
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Contributors
Author:
Nicholas G. White
Author:
Jonathan A. Kitchen
Author:
Sally Brooker
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