Abstract
In the title compound, {[Ag(C29H25N3)2]NO3·CH3OH·H2O} n , the Ag(I) cation is four-coordinated by two pyridine N atoms and two imidazole N atoms from four individual 4-(1-(5'-isopropyl-[1,1':3',1''-terphen-yl]-2'-yl)-1H-imidazol-2-yl)pyridine (i-pro-pyim) ligands. This gives rise to a highly distorted tetra-hedral geometry with bond angles falling in the range 100.33 (19)-122.76 (19)°. Two crystallographically independent i-pro-pyim ligands (A and B) adopt very similar conformations to one another, such that the dihedral angles between the pyridyl and imidazolyl rings in the two ligands are 40.7 (3) and 42.2 (3)°, respectively. Each i-pro-pyim ligand binds two symmetry-related Ag(+) cations, leading to the formation of 14-membered cyclic dimers, in which the Ag(I) atoms are separated by 6.963 (2) Å for the Ag-A 2-Ag dimer and 7.020 (2) Å for Ag-B 2-Ag. These cyclic dimers are alternately connected to each other by sharing Ag(I) atoms, resulting in the formation of a looped-chain structure extending along the [100] direction. Moreover, adjacent looped chains are connected by inter-molecular π-π inter-actions [centroid-to-centroid distance = 3.689 (4) Å], giving rise to the formation of a two-dimensional supra-molecular network propagating parallel to (110). Several inter-molecular C-H⋯O and O-H⋯O hydrogen bonds further contribute to the stabilization of the crystal structure.
Highlights
In the title compound, {[Ag(C29H25N3)2]NO3CH3OHH2O}n, the AgI cation is four-coordinated by two pyridine N atoms and two imidazole N atoms from four individual 4-(1-(50 -isopropyl-[1,10 :30,100 -terphenyl]-20 -yl)-1H-imidazol-2-yl)pyridine (i-pro-pyim) ligands
Two crystallographically independent i-pro-pyim ligands (A and B) adopt very similar conformations to one another, such that the dihedral angles between the pyridyl and imidazolyl rings in the two ligands are 40.7 (3) and 42.2 (3), respectively
AgI atoms, resulting in the formation of a looped-chain structure extending along the [100] direction
Summary
Group-9 metal complexes bearing phenylimidazole-based ligands are considered to be suitable triplet emitters for use in phosphorescent organic light-emitting diodes (PHOLEDs) because of their high efficiency and long-term stability (Cho et al, 2016). There are relatively few reports of the structures of metal complexes that exhibit coordination of pyridylimidazole (pyim) ligands with an L-type coordination sphere, which is similar to a phenylimidazole system. AgI coordination polymers built from pyim ligands have attracted much attention due to their structural diversity and photoluminescence properties which have been shown to depend on the nature of the counter-anion (Lee et al, 2016). The structural topology of AgI is quite sensitive to both the counter-anion and solvent molecules (Durá et al, 2014). E72, 972–975 research communications polymer is obtained by addition of the ligand to AgNO3 in methanol/acetonitrile. Symmetry codes: (i) x þ 1; y þ 1; z þ 1; (ii) x þ 2; y þ 1; z þ 1
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