Synthesis and characterization of nickel(II) complexes with 18-membered decaaza macrocycles 1,10-dialkyl-5,6,14,15-tetraphenyl-1,3,4,7,8,10,12,13,16,17- decaazacyclooctadecane

Article abstract of DOI:10.1081/SIM-200066995

Six new square-planar nickel(II) complexes of 18-membered decaaza macrocyclic ligands 5,6,14,15-tetraphenyl-1,3,4,7,8,10, 12,13,16,17- decaazacyclooctadecane [Ni((phenyl)₄ [18] ane N₁₀)] (ClO₄)₂ (1); 1,10-dimethyl- [Ni(Me₂ (phenyl)₄ [18] ane N₁₀)](C IO₄)₂ (2); 1,10-diethyl- [Ni(Et₂ (phenyl)₄ [18] ane N ₁₀)](ClO₄)₂ (3); 1,10-dipropyl-[Ni(Pr ₂ (phenyl)₄ [18] ane N₁₀)](ClO ₄)₂ (4); 1,10-dibutyl^iso- [Ni(Bu₂ (phenyl)₄ [18] ane N₁₀)](ClO₄)₂ (5); 1,10-dibenzyl-5,6,14,15-tetraphenyl-1,3,4,7,8,10,12,13,16,17- decaazacylooctadecane [Ni((Benzyl)₂ (phenyl)₄ [18] ane N₁₀)](ClO₄)₂ (6); [Ni((phenyl)₄ [18] ane N₁₀)(NCS)₂] (7); [Ni(Me₂ (phenyl) ₄ [18] ane N₁₀)(NCS)₂] (8); [Ni(Et₂ (phenyl)₄ [18] ane N₁₀)(NCS)₂] (9); [Ni(Pr ₂ (phenyl)₄ [18] ane N₁₀)(NCS)₂] (10); [Ni(Bu₂ (phenyl)₄ [18] ane N₁₀)(NCS) ₂] (11) and [Ni(Benzyl)₂ (phenyl)₄ [18] ane N₁₀)(NCS)₂] (12) have been prepared from the one-pot template condensation reaction of formaldehyde, benzildihydra-zone with alkyl and benzyl amine in the presence of nickel(II) ion. Elemental analyses, IR, UV-VIS spectroscopy, conductometric and magnetic measurements have been used to characterize the nickel(II) complexes of these decaaza macrocycles. The spectra of [Ni(R₂ (phenyl)₄ [18] ane N₁₀)](ClO ₄)₂ shows that the four nitrogen (α-diimine) atoms are coordinated to the nickel(II) ion. The hydrazones of the (α-diimine) function have the anti-anti configuration yielding a macrocyclic species with D_2h symmetry. The nickel(II) complexes are diamagnetic and four coordinates exhibit only weak interactions with different solvents. The physical and chemical properties of the complexes are compared with other closely related complexes. Copyright