کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1408023 1501717 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, crystal structures and theoretical studies of dinuclear Mn(II) and Ni(II) complexes of phenol-based “end-off” compartmental ligand
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Synthesis, crystal structures and theoretical studies of dinuclear Mn(II) and Ni(II) complexes of phenol-based “end-off” compartmental ligand
چکیده انگلیسی
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 (dπ(Mn) → π*(L)) and ILCT (π(L) → π*(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) (π(L) → dπ(Ni)) and most of the other transitions have ILCT character. As anticipated, various weak forces, i.e. anion-π/π-anion/anion-π/π-NH interactions as well as C-H/π interaction, play a key role in stabilizing the self-assembly process observed for both compounds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 1100, 15 November 2015, Pages 318-327
نویسندگان
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