Coordination complexes and polymers from the initial application of phenyl-2-pyridyl ketone azine in mercury chemistry
Date
2015-01-08
Authors
Khandar, Ali Akbar
Ghosh, Barindra Kumar
Lampropoulos, Christos
Gargari, Masoumeh Servati
Bhar, Kishalay
Yazdi, Seyed Abolfazl Hosseini
Cain, John M.
Mahmoudi, Ghodrat
Journal Title
Journal ISSN
Volume Title
Publisher
Pergamon-Elsevier
Abstract
A series of new mercury(II) azine Schiff base complexes have been synthesized and characterized from the initial use of phenyl-2-pyridyl ketone azine in Hg-II chemistry. The synthetic/crystallization technique utilized involved the use of a branched tube, where temperature differential allowed for the slow crystallization of the products. The synthesized compounds are the mononuclear [Hg(L)Cl-2] (1), [Hg(L)Br-2] (2), [Hg(L)(NO2)(2)] (3), and the dinuclear [Hg-2(mu-L)(SCN)(4)] (4) coordination compounds, as well as a 1D coordination polymer [Hg(L)(mu-I)(2)HgI2](n) (5) (L = phenyl-2-pyridyl ketone azine). From the X-ray data, it is evident that this versatile ligand functions as a bi- or tridentate chelate, and is also able to bridge two H-II centers. The crystal structures of 1 and 2 are similar, both containing two crystallographically independent Hg-II molecules, one tetrahedrally coordinated and one exhibiting trigonal bipyramidal geometry. The heptacoordinated Hg-II center in 3 adopts a distorted capped trigonal prismatic coordination sphere, while in the dinuclear complex 4, the metal ions are bridged via the bis(bidentate) L and each center is also bound to two S-bonded thiocyanate units. The one-dimensional coordination polymer in 5 consists of a tetrahedral HgI4 and a trigonal bipyramidal HgN3I2 chromophore unit, bridged by mu-I- bridges. The thermal stability of the crystal lattice in 1-5 follows the pattern 3 > 1 > 2 > 5 > 4, as studied by TG/DTA, while the TG data of 1,2, and 5 are similar, but different than the respective ones for 3 and 4, between which important similarities are observed. In the solid state, the ligand and compounds 1-5 exhibit intraligand pi -> pi* fluorescence at room temperature.
Description
Keywords
Azine, Coordination polymer, Luminescence, Mercury(II) halide/pseudohalide, X-ray structure, Schiff-base, Structural-characterization, Crystal-structures, Spectral properties, Thermal-stability, Halide-complexes, Donor ligands, Nitrite, Photoluminescence, Reactivity, Chemistry, Crystallography
Citation
Khandar, A. A. vd. (2015). "Coordination complexes and polymers from the initial application of phenyl-2-pyridyl ketone azine in mercury chemistry". Polyhedron, 85, 467-475.