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Palladium(II) Complexes of the Thiosemicarbazone and N ‐Ethylthiosemicarbazone of 3‐Hydroxypyridine‐2‐carbaldehyde: Synthesis, Properties, and X‐Ray Crystal Structure
Author(s) -
Demertzis Mavroudis A.,
Yadav Paras Nath,
KovalaDemertzi Dimitra
Publication year - 2006
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200690187
Subject(s) - chemistry , semicarbazone , palladium , crystal structure , supramolecular chemistry , crystallography , imine , electrochemistry , intermolecular force , ligand (biochemistry) , metal , titration , dissociation (chemistry) , stereochemistry , molecule , inorganic chemistry , catalysis , organic chemistry , biochemistry , receptor , electrode
Two novel, stable Pd II complexes, compounds 3 and 4 , of two 3‐hydroxypyridine‐2‐carbaldehyde thiosemicarbazones, 1 and 2 , resp., were prepared from Li 2 PdCl 4 . The single‐crystal X‐ray structure of complex 3 (= [Pd( 2 )Cl]) shows that the ligand monoanion coordinates in a planar conformation to the metal via the pyridyl N‐, the imine N‐, and the thiolato S‐atoms. Intermolecular H‐bonds, π–π , and CH ⋅ ⋅ ⋅ π interactions lead to a two‐dimensional supramolecular assembly. The electronic, IR, UV/VIS, and NMR spectroscopic data of the two complexes are reported, together with their electrochemical properties. A sophisticated experimental procedure was used to determine the multiple dissociation constants of the ligands 1 and 2 by UV/VIS titration.