Abstract
The synthesis, single crystal X-ray diffraction (SC-XRD) characterization and Hirshfeld topology analysis of molecular packing of the coordination polymer [Ag2L(H2O)2(ClO4)2]n, where L = 2,4,6-trimorpholino-1,3,5-triazine were discussed. The asymmetric unit comprises one Ag2L(H2O)2(ClO4)2 unit. The coordination geometries around the two silver atoms are different where Ag(1) is hexa-coordinated with one L, two bridged water, and two bridged perchlorate augmented with one strong Ag-O interaction from the morpholine O-atom of another ligand (L) unit. The coordination environment is more like to a distorted octahedral arrangement according to the criteria of continuous shape measurements. Ag(2) is coordinated to one L, one terminal water and one terminal perchlorate leading to a distorted trigonal planar arrangement around Ag(2). Hirshfeld analysis of molecular packing indicated that the most important intermolecular contacts affect the molecular packing of the studied complex are the H...H and the O...H interactions. Atoms in molecules (AIM) and natural bond orbital (NBO) analyses were used to describe the strength and nature of the Ag-O and Ag-N interactions.
Highlights
We present the synthesis of a new silver(I) perchlorate complex with s-triazine type-ligand namely, Crystals 2017, 7, 160; doi:10.3390/cryst7060160
The more donor atoms around the hexa-coordinated Ag(1) decrease its positive charge density compared to the tri-coordinated Ag(2)
All methods predicted very weak LP(Ag1)→LP*(Ag1ii ), which confirm that the argentophilic interaction among these Ag-atoms are insignificant
Summary
Silver(I) complexes attracted the attention of many research groups due to their fascinating structure aspects as well as their interesting biological activity as antimicrobial and antifungal agents [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. From structural point of view, the coordination environment of silver is unpredictable and is found surprising for a d10 metal ion. It could accommodate different coordination geometries, such as linear/bent, trigonal planar or tetrahedral which are the most common. Square planar and hexa-coordinated silver(I) complexes are less common in the literature [22]. It often serves as a connector (L-Ag-L) between ligands leading to fascinating supramolecular structures. We present the synthesis of a new silver(I) perchlorate complex with s-triazine type-ligand namely, Crystals 2017, 7, 160; doi:10.3390/cryst7060160 www.mdpi.com/journal/crystals
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