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Pyrazole Based Mono‐ and Di‐Substituted Half Sandwich d 6 Platinum Group Metal Complexes: Synthesis and Spectral Characterization
Author(s) -
Aradhyula Basava Punna Rao,
Mawnai Ibaniewkor L.,
Kollipara Mohan Rao
Publication year - 2019
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201800292
Subject(s) - pyrazole , chemistry , deprotonation , ligand (biochemistry) , metal , medicinal chemistry , benzene , platinum , stereochemistry , crystallography , catalysis , organic chemistry , ion , biochemistry , receptor
Reactions of pyrazole based ligand and halide bridged arene d 6 metal precursors resulted a series of mono and di‐substituted pyrazole based half sandwich d 6 metal complexes. In general, they are formulated as [(arene) M LCl 2 ] [ M = Ru, arene = benzene ( 1 ), p ‐cymene ( 2 ), arene = Cp*, M = Rh ( 3 ) and Ir ( 4 )] and [(arene) M L 2 Cl] [ M = Ru, arene = benzene ( 5 ), p ‐cymene ( 6 ), arene = Cp*, M = Rh ( 7 ) and Ir ( 8 )]. All these complexes were characterized by various spectroscopic techniques (IR, 1 H NMR, ESI‐MS, and UV/Vis). The molecular structures were confirmed by single‐crystal X‐ray diffraction technique. Spectroscopic studies revealed that complexation i.e., mono‐ and di‐substitution occurred by the ratio‐based reaction between pyrazole ligand and metal precursor through the neutral nitrogen rather than protic nitrogen. In these complexes deprotonation of the protic nitrogen does not occur unlike the other complexes containing pyrazole derivatives, in which the pyrazole ligand is anionic.