Zinc dicarboxylate polymers and dimers: thiourea substitution as a tool in supramolecular synthesis†
Abstract
The reactions of the zinc thiourea complexes [Zn{SC(NHR)(NHR′)}4]Cl2
(L =
L1, R = H, R′
= Me; L =
L2, R = Me, R′
= Me) with a range of dicarboxylates have been investigated. From these reactions eleven products –
[Zn(L1)2(μ-terephthalate)]n, [Zn(L1)2(μ-fumarate)]n, {[Zn(L1)2(μ-isophthalate)]·H2O}n, [Zn(L1)2(μ-1,3-phenylenediacetate)]n, [Zn(L1)2(μ-phthalate)]2·4H2O, {[Zn(L2)2(μ-terephthlate)]·0.5H2O}n, [Zn(L2)2(μ-fumarate)]n, [Zn(L2)2(μ-isophthalate)]2·2H2O, [Zn(L2)2(μ-phthalate)]n, [Zn(L2)2(μ-maleate)]2·2H2O and [Zn(L2)2(μ-citraconate)]2·2H2O – have been crystallographically characterised. The structural characterisation of these compounds demonstrates that by increasing the number of methyl substituents on the