Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/6217
Title: Copper(II) coordination polymers of imdc− (H2imdc+ = the 1,3-bis(carboxymethyl)imidazolium cation): unusual sheet interpenetration and an unexpected single crystal-to-single crystal transformation
Authors: Abrahams, BF
Maynard-Casely, HE
Robson, R
White, KF
Keywords: Polymers
Copper
Solvents
Molecules
Crystal structure
Ligands
Issue Date: 8-Oct-2013
Publisher: Royal Society of Chemistry
Citation: Abrahams, B. F., Maynard-Casely, H. E., Robson, R., & White, K. F. (2013). Copper(ii) coordination polymers of imdc− (H2imdc+ = the 1,3-bis(carboxymethyl)imidazolium cation): unusual sheet interpenetration and an unexpected single crystal-to-single crystal transformation. CrystEngComm, 15(45), 9729-9737. doi:10.1039/C3CE41226A
Abstract: The monoanion of 1,3-bis(carboxymethyl)imidazolium (H2imdc+) combines with Cu(II) to produce an undulating 2D coordination polymer of composition [Cu2(imdc)2(CH3OH)2](BF4)2·(CH3OH)(H2O) (1) in which copper acetate-like dimers, linked by imdc− ligands, act as 4-connecting centres. Cationic sheets stack on top of each other in an A, B, A, B… fashion and produce a structure that contains channels running parallel to the plane of network. Tetrafluoroborate anions are located in channels between sheets. Upon removal of coordinated and noncoordinated solvent molecules a single crystal-to-single crystal transformation occurs to yield a similar compound but with BF4 − anions now coordinated. CO2 isotherms measured at 258 and 273 K show only modest uptake of CO2 but provide an indication that the sheets move apart at elevated pressures in order to accommodate the guest molecules. A compound of composition [Cu3(OH)2(imdc)2]·SiF6·2H2O·2MeOH (3), which possesses a 3D network, is formed by the combination of copper(II) acetate, copper(II) hexafluorosilicate and Himdc. In this structure infinite parallel Cu3(OH)2 chains are linked by bridging imdc− ligands to form channels that have an approximately triangular cross-section. These channels are occupied by SiF6 2− anions in addition to solvent molecules. When copper(II) acetate is combined with Himdc in the appropriate ratio, a 1D coordination polymer of composition Cu(imdc)2 (4) is formed in which pairs of imdc− anions bridge Cu(II) centres. When the reaction is performed in the presence of NaBF4 a minor crystalline product with tetragonal symmetry is isolated in addition to the 1D coordination polymer. This compound of composition Cu2(imdc)4NaBF4·7H2O (5) consists of 2D Cu(imdc)2 networks and features an unusual mode of interpenetration. © 2013, The Royal Society of Chemistry.
Gov't Doc #: 6060
URI: http://dx.doi.org/10.1039/c3ce41226a
http://apo.ansto.gov.au/dspace/handle/10238/6217
ISSN: 1499-8033
Appears in Collections:Journal Articles

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