Involvement of various anions in tuning the structure of silver(I) coordination polymers based on the S- donor ligands: Syntheses, crystal structure and uptake properties

Abstract

An investigation of the impact of shape, size and coordination ability of the counter ions was carried out on a five silver(I)- 1, 2- bis (1-methylthioimidazolyl) ethane coordination polymers namely, [Ag2L (NO3)2]n (1), [Ag2L (SO3CF3)2]n (2), {[AgL][ClO4]}n (3), {[AgL]2[BF4]2}n (4) and {[AgL]3[PF6]3}n (5). They have been characterized by the elemental analysis, IR spectroscopy, PXRD and single crystal X-ray diffraction. The [Ag2L (NO3)2]n (1) was produced in the presence of a strongly coordinating anion (NO3−). In the 1D structure of 1, the ligand appears in a pentadentate form and the nitrate acts as a co-ligand with a bidentate coordination fashion. As in 1, in 2 CF3SO3− with a moderately coordinating potential builds up a natural structure with only one kind of coordination mode for the ligand and two types of coordination geometry for the silver atoms. The difference between the structures 1 and 2 can be attributed to the size and coordination ability of their anions which has changed the coordination environment of silver ions without changing the coordination fashion of the ligand. In polymer 3, by decreasing the coordination ability and increasing size of perchlorate relative to the previous considered anions, the coordination mode of the ligand and hence the coordination environment of the silver centers were changed. Unlike all the title compounds in the cationic structure of 3, one of the crystallographic independent AgI centers adopts a distorted trigonal planer environment. Complex 4 with an extended helical chains of [Ag2L]2+n was obtained, when AgBF4 with a small, non-coordinated anion was used to react with the L ligand. X-ray diffraction analysis reveals that the most changes were detected in polymer 5 with a rare triple chain structure and a scarce coordination mode of the ligand by using the bulky, uncoordinated PF6− anion. In fact, changing the type of the anion causes a change in the coordination mode of the ligand and in turn in the structural coordination geometry of the polymer. Additionally, the adsorption potential of the polymers were examined by the NH3 and H2S gases.

Supplementary files

Article information

Article type
Paper
Submitted
03 Feb 2021
Accepted
30 Aug 2021
First published
14 Sep 2021

CrystEngComm, 2021, Accepted Manuscript

Involvement of various anions in tuning the structure of silver(I) coordination polymers based on the S- donor ligands: Syntheses, crystal structure and uptake properties

S. soleymani babadi, A. Beheshti, M. bahrani, B. Salahshour nia, H. R. Zafarian, D. Trzybiński, P. Mayer and K. Wozniak, CrystEngComm, 2021, Accepted Manuscript , DOI: 10.1039/D1CE00172H

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