Synthesis and Spectral Studies of a Novel 20-Membered Unsymmetrical Dinucleating [N8] Macrocycle and Its Bimetallic Complexes, M2LCln(ClO4)2 (n = 2, M = Co, Ni orCu; n = 4, M = Cr or Fe)

• Autorzy: Siddigi K. , Khalid M. , Khan M.
• Języki publikacji: EN

Abstrakty

EN

A 20-membered octaaza unsymmetrical Schiff base macrocycle, 6,10,16,20-tetramethyl- 7,9,17,19-tetraphenyl[1,5,7,9,11,15,17,19]octaazacycloeicosa-5,10,15,20-tetraene dihydroperchlorate (Lx2HClO4), has been obtained as an off-white amorphous solid by refluxing a mixture of 1,3-diaminopropane, N-acetylaniline and excess HCHO in the presence of HClO4 in ethanol, characterized by physico-chemical and spectroscopic studies. Its reactions with transition metal salts have afforded air stable solids with stoichiometryM2LCln(ClO4)2 (n=2,M=Co,Ni orCu and n = 4,M=Cr or Fe).Magnetic moment, IR and UV-visible spectroscopic data confirm encapsulation of metal ions through chelation from unsymmetrical aza groups and additional coordination by counter ClO4 which maintains hexa coordination around the metal ions. A low-spin distorted square-pyramidal geometry with distorted C4v symmetry of basal plane has been indicated for Co2+ complex. EPR data on Cu2+ complexes have indicated a tetragonal distortion with g|| > g_ > 2.0 and G < 4.0 with orbital reduction factor K_ > K|| favouring the presence of exchange coupling around the Cu2+ environment.

Słowa kluczowe

EN

dinucleating macrocycle; unsymmetrical [N8] macrocycle; metal-encapsulated complexes; polyaza-macrocycle

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2006
• Tom: Vol. 80, nr 3
• Strony: 377--386
• Opis fizyczny: Bibliogr. 33 poz.

Twórcy

autor

Siddigi K.

autor

Khalid M.

autor

Khan M.

• Division of Inorganic Chemistry, Department of Chemistry, Aligarh Muslim University, Aligarh - 202002, India

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