Structures and properties of the copper(II) and nickel(II) complexes of NN′-bis[(2-hydroxy-5-methylphenyl)phenylmethylene]-4-azaheptane-1,7-diamine and related compounds: direct comparison of d⁸and d⁹analogues

Abstract

Structures and Properties of the Copper(ii) and Nickel(i1) Complexes of NN'-Bis[ (2hyd roxy-5-methylphenyl) phenyl methylene] -4-azaheptane-1,'ir-diamine and Related Compounds: Direct Comparison of d 8 and d9 Analogues

Five- and six-coordinated cobalt(II), nickel(II), copper(II), and zinc(II) complexes of the pentadentate Schiff base ligands N,N'-bis[(2-hydroxy-5-Y-phenyl)phenylmethylene]-4-azaheptane-1,7-diamine (Y = Cl or Ch3) and N,N'-bis[(5-chloro-2-hydroxyphenyl)phenylmethylene]-4-thiaheptane-1,7-diami

“…Their visible spectra (Figure la, Table II) consist of one asymmetric band between 680 and 740 nm, which is consistent13 with the distorted square-pyramidal structure found for CumbpN. 4 The similarity of the spectra of Cu(cbpS)-72H20 and Cu(cbpN) to that of Cu(mbpN)• 72H20 suggests that these compounds are also approximately square pyramidal with the central sulfur or nitrogen atom coordinated to the copper atom. The hemihydrates (Cu-(mbpN)'72H20 and Cu(cbpS)'72H20) apparently have the water present as water of crystallization, similar to the case of the zinc complexes.…”

Direct Acylation of Phenol and Naphthol Derivatives in a Mixture of Graphite and Methanesulfonic Acid

“…The o-hydroxyarylketones are versatile intermediates in the synthesis of salens, 1,2 xanthones, 3 chromanones, 4 flavones, 5 pharmaceutical compounds, 6 and low-molecularweight mesogens, 7 among others. Although the Fries rearrangement of acyloxy benzenes or naphthalenes provides useful routes to these compounds, more than a stoichiometric amount of AlCl 3 is required because the acid is trapped by the products.…”

{2,2′-[1,1′-(4-Azaheptane-1,7-diyldinitrilo)diethylidyne]diphenolato}copper(II)

“…Bond lengths in the coordination polyhedron are in agreement with values from analogous structures. The CuÐO [1.9533 16 (Healy et al, 1975). The CuÐN3 bond in (I) is considerably longer than the corresponding NiÐN3 bond [2.0505 (12) A Ê ] in the analogous Ni complex (Amirnasr, Schenk et al, 2006) and re¯ects a weaker axial interaction which is typical of Jahn± Teller-sensitive copper(II) complexes.…”