Wang, Suna and Xing, Hang and Li, Yizhi and Bai, Junfeng and Pan, Yi and Scheer, Manfred and You, Xiaozeng (2006) 2D and 3D cadmium(II) coordination polymers from a flexible tripodal ligand of 1,3,5-tris(carboxymethoxy)benzene and bidentate pyridyl-containing ligands with three-, eight- and ten-connected topologies. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (15). pp. 3041-3053. ISSN 1434-1948
Full text not available from this repository. (Request a copy)Abstract
Four novel cadmium(II) coordination polymers, [Cd(3)-(TCMB)(2)(4,4'-bipy)(H(2)O)(16)](n) (1), [Cd(3)(TCMB)(2)(bpe)(H(2)O)(13)](n) (2), [Cd(3)(TCMB)(2)(bpe)(2)(H(2)O)(4)](n) (3), and [Cd(3)(TCMB)(2)-(dpp)(2)(H(2)O)(3)](n) (4), [TCMB = 1,3,5-tris(carboxymethoxy)benzene, 4,4-bipy = (4,4-bipyridine), bpe = 1,2-bis(4-pyridyl)ethane, dpp = 1,3-bis(4-pyridyl)propane] have been hydrothermally synthesized by the self-assembly of the flexible tripodal acid TCMB and Cd(OAc)(2)(.)2H(2)O with pyridyl-containing ligands possessing different flexibilities. Single-crystal X-ray diffraction analysis reveals that the four polymers exhibit novel frameworks due to diverse coordination modes and different conformations of the flexible TCMB as well as pyridyl- containing ligands. Complex 1 shows a unique twofold parallel interpenetrating 2D honeycomb network structure with an unusual 6(3) topology, in which two different large hexagonal rings are arranged alternately, with extraordinary dimensions of ca. 22.172(6) x 12.947(2) angstrom (A) and 17.233(2) x 12.947(2) angstrom (B) based on the distances of the atoms at the opposite positions of the rings. Complex 2 is almost isostructural to complex 1, except that the bidentate bpe ligands bridge the cadmium centers in an anti conformation, rendering the network more flexible. Complex 3 features a 3D network with one of the scarce eight-connected (4(6), 6(14), 8(8))(4(3))(2) topologies based on the rare CdI(2)-type layer constructed from secondary building units (SBUs) of rare [Cd(3)(CO(2))(4)](2-) isosceles triangle cadmium clusters. Complex 4 possesses distorted CdI(2)-type layers constructed from unprecedented ten-connected Cd3 clusters which are linked by more flexible dpp ligands in a trans-gauche (TG) conformation in (4,4) networks, leading to another 3D framework of the unusual (4(18), 6(24), 8(3))(4(3))(2) topology. Such an arrangement represents the highest connected topology presently known for the frameworks. Among them, complex 1 displays photoluminescent properties at 460 mri due to the ligand-to-metal charge transfer (LMCT).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | METAL-ORGANIC FRAMEWORKS; SECONDARY BUILDING UNITS; MAGNETIC-PROPERTIES; TRIMESIC ACID; SUPRAMOLECULAR ISOMERISM; ADSORPTION PROPERTIES; NANOPOROUS MATERIAL; CRYSTAL-STRUCTURES; POROUS FRAMEWORK; HYDROGEN-BONDS; metal-organic frameworks; tripodal ligands; topology; metal carboxylates |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Manfred Scheer |
| Depositing User: | Petra Gürster |
| Date Deposited: | 24 Feb 2021 07:39 |
| Last Modified: | 24 Feb 2021 07:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/34175 |
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