Triflate anion and ligand influences in silver(i) coordination polymers of four isomeric dipyridyl ketone oximes

Abstract

The synthesis and X-ray characterisation of four isomeric dipyridyl ketone oxime ligands, 4,49-dipyridyl ketone oxime, L 44 , 3,39-dipyridyl ketone oxime, L 33 , 2,4-dipyridyl ketone oxime, L 24 and 2,3-dipyridyl ketone oxime, L 23 is described. X-ray structural characterisation of the precursor ketones 3,39-dipyridyl ketone, L1, and 2,4-dipyridyl ketone, L2, is also reported for comparison. Four AgCF 3 SO 3 complexes of the dipyridyl ketone oxime ligands were prepared and structurally characterised, [Ag(L 44 ) 2 ](CF 3 SO 3 ), 1, ' , 3, and [Ag 2 L 23 (CF 3 SO 3 ) 2 ] ' , 4. The structural role of the CF 3 SO 3 2 anion in the formation of Ag(I) coordination polymer networks, together with the effect of the varying pyridyl substitution patterns of L 44 , L 33 , L 24 and L 23 was investigated. In 1 the CF 3 SO 3 2 anion was unbound and disordered. It was encapsulated in the channels of a honeycomb 3D H-bonded structure. In 2 the CF 3 SO 3 2 anion remained unbound, being encapsulated within the centre of a helical polymer chain. In 3 the CF 3 SO 3 2 anion was weakly bound to the Ag(I) ion and as such decorated the side of a bowed 1-D chain. The two different CF 3 SO 3 2 anions in 4 adopted a range of binding modes from monodentate, bismonodentate to tris-monodentate with the Ag(I) ions and gave rise to the formation of an unusual CF 3 SO 3 2 bridged 2-D network.

Silver(I) coordination polymers assembled from flexible cyclotriphosphazene ligand: structures, topologies and investigation of the counteranion effects

“…Effect of counteranions on the structures of (1)-(6). The counterions having different coordination abilities, electron densities and steric bulkiness play a crucial role in the assembly of the supramolecular architecture (Wan et al, 2014;Argyle et al, 2013;Xiong et al, 2013;Sague et al, 2008;Feazell et al, 2005). In this study, the counterions NO Ainscough et al, 2005;, but they exhibit weak AgÁ Á ÁO interactions [between 2.737 (5) and 3.149 (4) Å ] in (1), AgÁ Á ÁF interactions [2.851 (3) Å ] in (2) and AgÁ Á ÁO interactions [3.039 (9) Å ] in (3), as shown in Fig.…”

Quinoline Functionalized Schiff Base Silver (I) Complexes: Interactions with Biomolecules and In Vitro Cytotoxicity, Antioxidant and Antimicrobial Activities

“…In the structures of L2 complexes, the involvement of anion in the coordination to the Ag(I) center seems to be influenced by the less steric hindrance of the benzothiazole moiety as seen in complexes Q7 and Q12 structures ( Figure 2 c,d). These types of coordination by trifluoromethanesulfonate anion have been reported [ 47 ]. In L1 complexes, the hydrolytic cleavage of one molecule of the Schiff base ligands could be related to the steric repulsions between the two Schiff bases.…”

Use of the oxime–oximato binding mode to stabilise mixed valence copper iodide polymer networks using dipyridyl ketone oxime ligands

“…The isomeric dipyridyl oxime ligands were synthesised by literature methods. 13 All reactions were attempted in bulk with a 1 : 1 metal to ligand ratio. With the exception of 2 and 5 molar ratios of the isolated compounds were consistent with the initial stoichiometric ratios.…”

“…Weak and poorly resolved peaks in the range 1638-1619 cm −1 were assigned to the CN moiety and differed from the free ligand where a single peak was observed at 1615 cm −1 . 13 Yellow X-ray quality crystals were grown from the slow diffusion of L 33 in MeOH into a MeCN solution of CuI.…”

“…The ligands L 23 , L 24 , L 33 and L 44 were prepared according to literature methods. 13 All solvents were used as received, and were of LR grade or better. Elemental microanalyses were carried out at the Campbell Microanalytical Laboratory, University of Otago.…”