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Secondary IHB interactions of zinc-coordinated substrates to proton donors of the enzyme such as the guanidinium group of arginine or the imidazolium group of histidine are important parts of an H-bond network that can serve as a proton relay. Numerous biomimetic carbonato and hydrogencarbonato complexes of zinc were structurally characterized . We became interested in investigating the performance of NHfunctional guanidine ligands in the stabilization of mono- and dinuclear complexes with ZnÀOH, ZnÀOCOOH, ZnÀOCOOÀZn and ZnÀOÀZn functionalities.
2). 7). 7 Fixation of CO2 and cis-bromination of a,b-unsaturated carboxylate ligands. Recently, it has been found that the outcome of some cycloadditions can be altered remarkably when they are performed inside the cavity of cyclodextrines , selfassembled molecular capsules , or coordination cages . This fact intrigued us greatly and awoke our interest in the Diels–Alder reactivity of the calixarene-like [M2L2(L0 )] þ complexes bearing unsaturated carboxylate coligands L0 . The results are discussed in more detail.