Bis-tris propane as a flexible ligand for high-nuclearity complexes. (1st August 2018)

• Record Type: Journal Article
• Authors: Murrie, Mark
• Is Part Of: Polyhedron. Volume 150(2018)
• Page Start: 1
• Page End: 9
• Publication Date: 2018-08-01
• Subjects: Bis-tris propane -- Polydentate ligands -- High nuclearity complexes -- Heterometallic complexes -- Magnetic properties; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2018.04.038
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: A survey of the high-nuclearity complexes synthesised by using the Bis-tris propane ligand is presented. The ligand provides high flexibility and contains multiple binding sites and hence, excellent potential as a bridging ligand for both homo- and heterometallic complexes. Abstract: Polymetallic complexes can be assembled using a wide array of polydentate ligands that give an almost unlimited toolbox to prepare new molecular architectures with fascinating structures and interesting magnetic properties. Bis-tris propane is one such a polydentate ligand that has been used to prepare homo- (3d or 4f) and heterometallic (3d/3d′ or 3d/4f) complexes, ranging from simple complexes such as {Ni4 } to spectacular 3d/3d′ {Cu8 Zn8 } or {Mn18 Cu6 } complexes. It shows a flexibility in binding mode, utilizing up to six of its potential ligand donor atoms and displaying multiple levels of deprotonation, able to bridge up to six metal ions. The ligand has a particular affinity for binding 3d ions such as Cu(II) or Co(III) in heterometallic syntheses and this can provide a flexible structure-directing effect. This concept has been exploited to prepare new heterometallic 3d/3d′ complexes that display interesting levels of complexity; 3d/4f complexes such as {Cu3 Tb2 } that show single-molecule magnet behavior where superexchange interactions quench quantum tunneling of the magnetization, or {Co3 Gd3 } where the magnetocaloric properties arise by using Bis-tris propane to separate the Gd(III) ions and weaken Gd(III)…Gd(III) interactions.