• Louka, Febee R.
• Torvisco, Ana
• Fischer, Roland C.
• Handa, Makoto
• Mikuriya, Masahiro
• Nakashima, Kai
• Massoud, Salah S.
• Mautner, Franz A.
• Salem, Nahed N. M. H.
• Dial, Madison T.

Abstract

<p>Three new tripod tetradentate phenolate-amines (H₂L¹, H₂L⁴ and H₂L⁹), together with seven more already related published ligands, were synthesized, and characterized. With these ligands, two new dinuclear doubly-bridged-phenoxido copper(II) complexes (3, 4), and six more complexes (1, 2, 5–8), a new trinuclear complex (9) with an alternative doubly-bridged-phenoxido and –methoxido, as well as the 1D polymer (10) were synthesized, and their molecular structures were characterized by spectroscopic methods and X-ray single crystal crystallography. The Cu(II) centers in these complexes exhibit distorted square-pyramidal arrangement in 1–4, mixed square pyramidal and square planar in 5, 6, and 9, and distorted octahedral (5+1) arrangements in 7 and 8. The temperature dependence magnetic susceptibility study over the temperature range 2–300 K revealed moderate–relatively strong antiferromagnetic coupling (AF) (|J| = 289–145 cm⁻¹) in complexes 1–6, weak-moderate AF (|J| = 59 cm⁻¹) in the trinuclear complex 9, but weak AF interactions (|J| = 3.6 &amp; 4.6 cm⁻¹) were obtained in 7 and 8. No correlation was found between the exchange coupling J and the geometrical structural parameters of the four-membered Cu₂O₂ rings.</p>

Topics

• polymer
• single crystal
• copper
• susceptibility
• amine
• molecular structure