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Title: Solid-state structural transformations and photoreactivity of 1D-ladder coordination polymers of PbII
Authors: Kole, G.K.
Peedikakkal, A.M.P.
Toh, B.M.F.
Vittal, J.J. 
Keywords: coordination polymers
solid-state reactions
structure elucidation
Issue Date: 18-Mar-2013
Citation: Kole, G.K., Peedikakkal, A.M.P., Toh, B.M.F., Vittal, J.J. (2013-03-18). Solid-state structural transformations and photoreactivity of 1D-ladder coordination polymers of PbII. Chemistry - A European Journal 19 (12) : 3962-3968. ScholarBank@NUS Repository.
Abstract: An attempt has been made to design double-stranded ladder-like coordination polymers (CPs) of hemidirected PbII. Four CPs, [Pb(μ-bpe)(O 2C-C6H5)2]×2H2O (1), [Pb2(μ-bpe)2(μ-O2C-C 6H5)2(O2C-C6H 5)2] (2), [Pb2(μ-bpe)2(μ- O2C-p-Tol)2(O2C-p-Tol)2]× 1.5 H2O (3) and [Pb2(μ-bpe)2(μ-O 2C-m-Tol)2(O2C-m-Tol)2] (4) (bpe=1,2-bis(4′-pyridyl)ethylene), have been synthesised and investigated for their solid-state photoreactivity. CPs 2-4, having a parallel orientation of bpe molecules in their ladder structures and being bridged by carboxylates, were found to be photoreactive, whereas CP 1 is a linear one-dimensional (1D) CP with guest water molecules aggregating to form a hydrogen-bonded 1D structure. The linear strands of 1 were found to pair up upon eliminating lattice water molecules by heating, which led to the solid-state structural transformation of photostable linear 1D CP 1 into photoreactive ladder CP 2. In the construction of the double-stranded ladder-like structures, the parallel alignment of Cï£C bonds in 2-4 is dictated by the chelating and μ2-η2:η1 bridging modes of the benzoate and toluate ligands. The role of solvents in the formation of such double-stranded ladder-like structures has also been investigated. A single-crystal-to-single-crystal transformation occurred when 4 was irradiated under UV light to form [Pb2(rctt-tpcb)(μ-O2C-m-Tol) 2(O2C-m-Tol)2] (5). Dehydrate to be photoactive! The solid-state structural transformation of a linear coordination polymer of PbII into the corresponding ladder coordination polymer (see figure) and a single-crystal-to-single-crystal [2+2] cycloaddition reaction under UV light are reported. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Chemistry - A European Journal
ISSN: 09476539
DOI: 10.1002/chem.201203678
Appears in Collections:Staff Publications

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