Syntheses, Structures, and Properties of Three Novel Coordination Polymers of Silver(I) Aromatic Carboxylates with Hexamethylenetetramine Exhibiting Unique Metal−π Interaction

Abstract

Three interesting coordination polymers, [Ag4(μ4-hmt)(μ4-η2-nda)2]·2H2O (1), [Ag2(μ-hmt)2(μ-bi-η2-bna)]·2H2O·MeCN (2), and [Ag2(μ4-hmt)(η2-hna)(MeCN)](hna)·H2O (3) (hmt = hexamethylenetetramine, nda = 2,6-naphthalenedicarboxylate, bna = 2,2‘-dihydroxy-1,1‘-binaphthalene-3,3‘-dicarboxylate, and hna = 1-hydroxy-2-naphthalenecarboxylate), were obtained from the reaction of silver(I) aromatic carboxylates in MeCN solution with hmt in CH2Cl2 solution via the liquid diffusion method. In these complexes, the aromatic carboxylates ligate to the metal atoms via a unique η2-coordination mode involving their aromatic rings, in addition to the normal coordination modes utilizing their carboxylate oxygen atoms. These complexes show interesting electronic properties similar to those reported for the silver(I) complexes of other polycyclic aromatic compounds. Both 1 and 2 exhibit a strong blue photoluminescence at room temperature.

A novel 3D silver(I) supramolecular framework assembled from hybrid ligands incorporating Ag···C interactions

“…These interactions in 1 may be considered as a medium dihapto aromatic coordination of the benzene ring of npd to the Ag(I) ion, and are very significant, in the present case, for [46][47], such interactions involving npd unit in the solid state have rarely been documented in the literatures [48]. The AgÁÁÁC npd (g 2 ) interactions as well as inter-layer hydrogen bonds and pÁÁÁp stacking interactions play important roles in extending the 1D chains to 3D supramolecular framework (Fig.…”

Synthesis, Structure and Luminescent Properties of a Two-dimensional Network Asymmetric Biscarboxylate Silver(I) Coordination Polymer

“…The emission of 1 is tentatively assigned to a ligand-to-metal charge transfer of Hcpa [12-21, 31, 35]. 1 represents a good example of a blue luminescent organometallic compounds [21,35].…”

Influence of lanthanide ion on the morphology and luminescence properties of cadmium sulphide nanocrystals

“…The enhancement of the fluorescence emission of Gddoped CdS nanoneedles is due to the chelation of the EDTA with the Gd 3+ ion. This effectively increases the rigidity of the ligand and reduces the loss of energy by radiation with less decay of the intraligand emission excited state [33]. Hence, the origin of the strong luminescence emission is attributed to ligand-metal charge transfer (LMCT).…”