کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1312586 975467 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-coordinated lanthanum(III) complexes with new mono- and bidentate phosphoryl donors; spectroscopic and structural aspects
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
High-coordinated lanthanum(III) complexes with new mono- and bidentate phosphoryl donors; spectroscopic and structural aspects
چکیده انگلیسی

Monodentate and bidentate ligands PhNHP(O)(NC4H8O)2 (1) and PhC(O)NHP(O)(NH(tert-C4H9))2 (2) were used to prepare new 7, 9 and 10-coordinated lanthanum(III) complexes; La(1)2Cl3(H2O)2 (3), La(1)2(NO3)3H2O.La(1)2(NO3)3CH3CN (4) and La(2)2(NO3)3 (5), respectively. Crystallization of compound 2 in CH3OH:CH3CN leads to one conformer in contrast to the crystallization result from CHCl3:n-C7H16 (two conformers). Compound 4 contains two independent nine-coordinated La(III) complexes that are different in the solvated molecules (H2O and CH3CN). Some structural and electronic perturbations in coordinated ligand were occurred upon complexation, that are confirmed by increase of 2JPH, 3JPH and 6JPH coupling constants from the free ligand 1 to complexes 3 and 4. The steric repulsions in the first coordination sphere of La3+ ion, metal–ligand (M–L) binding strength and PO stretching frequency are very influenced by changing the counter ion from Cl− to NO3-. Comparing the X-ray crystallography data of free ligand 2 with bis-chelated complex 5, it is found that the phosphoryl group is more reactive than carbonyl counterpart. A blue shift of the ν(N–H) vibration is observed in line with the weakening of the hydrogen bond from N–H···OPhosphoryl in 1 to N–H···Cl in 3. Three dimensional butterfly-shape structures are seen in the unit cell of complex 3, which are produced by OWater–H···OMorpholine hydrogen bonds.

New monodentate O-donor ligand P(O)(PhNH)(NC4H8O)2 (1) and bidentate O,O′-donor ligand P(O)(PhC(O)NH)(NH(tert-C4H9))2 (2) were used to prepare new 7-, 9- and 10-coordinated lanthanum(III) complexes; La(1)2Cl3(H2O)2 (3), La(1)2(NO3)3H2O.La(1)2(NO3)3CH3CN (4) and La(2)2(NO3)3 (5), respectively.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Inorganica Chimica Acta - Volume 363, Issue 10, 20 June 2010, Pages 2318–2324
نویسندگان
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