Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1408023 | Journal of Molecular Structure | 2015 | 10 Pages |
Abstract
Two novel complexes [Mn2(phmp)2](ClO4)2 (1) and [Ni2(phmp)(μ-H2O)(H2O)4](NO3)3 (2) were synthesized using an “end-off” compartmental ligand [H-phmp = 4-Methyl-2,6-bis-(pyridin-2-yl-hydrazonomethyl)-phenol] with Mn(II)-perchlorate and Ni(II)-nitrate salts as metal precursors. Both these complexes were characterized by spectroscopic (IR, UV-Vis) and X-ray crystal structure analysis. The ligand, H-phmp acts as a pentadentate NNONN donor for both the metal complexes and the geometry of the complexes 1 and 2 is distorted octahedral. The DFT optimized bond distances and angles are well correlate to the X-ray structure bond parameters. For complex 1 the transitions at 435 nm and 428 nm have mixed MLCT (dÏ(Mn) â Ï*(L)) and ILCT (Ï(L) â Ï*(L)) character whereas other transitions correspond to intra-ligand charge transfer transitions (ILCT). For complex 2, weak transitions at 464 and 405 nm correspond to ligand to metal charge transfer transitions (LMCT) (Ï(L) â dÏ(Ni)) and most of the other transitions have ILCT character. As anticipated, various weak forces, i.e. anion-Ï/Ï-anion/anion-Ï/Ï-NH interactions as well as C-H/Ï interaction, play a key role in stabilizing the self-assembly process observed for both compounds.
Related Topics
Physical Sciences and Engineering
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Organic Chemistry
Authors
Atanu Jana, Kinsuk Das, Saugata Konar, Anamika Dhara, Sujan Biswas, Sudipta Chatterjee, Tapan Kumar Mondal,