Molecular tectonics: on the role of counter-ions in the dimensionality of silver coordination networks

Abstract

The role played by different anions (XF 6 2 (X 5 P, As, Sb), BF 4 2 ) on the connectivity of coordination networks formed by a combination of different silver salts and an organic tecton based on piperazine bearing two pyridine units has been studied in the crystalline phase by X-ray diffraction on single crystal. All four weakly coordinating anions lead to the formation of analogous 2-D coordination networks. For the isostructural anions XF 6 2 (X 5 P, As, Sb) the crystals are isomorphous.

Fine tuning of copper(ii)–chlorophyll interactions in organic media. Metalation versus oxidation of the macrocycle

“…The most distinct tendency to both one-electron oxidation and tetrapyrrolic ring-opening is exhibited by weakly coordinated complexes containing solvent ligands or, optionally, triflate ions. 48 In turn, chloride complexes, within a broad concentration range, are involved in reversible electron transfer processes of Chla and simple metalation of Pheoa.…”

“…The most distinct tendency to both one-electron oxidation and tetrapyrrolic ring-opening is exhibited by weakly coordinated complexes containing solvent ligands or, optionally, triflate ions. 48 In turn, chloride complexes, within a broad concentration range, are involved in View Article Online reversible electron transfer processes of Chla and simple metalation of Pheoa.To gain more insight into the role of coordinating counter ions, the reactions of Pheoa and Chla with CuTf 2 in the three organic solvents were carried out in the presence of various amounts of (Et 4 N)Cl and (Bu 4 N)AcO. The results of the spectroscopic observations are summarized in Table 2.…”

Substituent dependent topologies in cobalt isophthalate coordination polymers with bis(pyridylmethyl)piperazine coligands

“…Bis(4-pyridylmethyl)piperazine (4-bpmp) and bis(3-pyridylmethyl)piperazine (3-bpmp) were prepared via modification of a published procedure [29]. Water was deionized above 3 MX cm in-house.…”

Synthesis and structure of a cobalt dicyanamide chain coordination polymer incorporating a long-spanning hydrogen-bonding capable diimine with a novel binodal (4,6)-connected supramolecular topology

“…Pink crystals of the compound 1 were prepared in moderate yield [13] by layering of an aqueous solution of cobalt acetate, sodium dicyanamide and 4-bpmp [14] in a 1:2:1 mole ratio. The infrared spectrum of 1 indicated the presence of dicyanamide C-N stretching bands at 2150-2300 cm À1 , along with a broad feature around $3200 cm À1 , imputed to O-H vibrational modes within the aqua ligands.…”