Synthesis, structure, and reactivity of bis(N,N′-bis(2-hydroxybenzylidene)-2-hydroxyphenylmethanediaminato)zirconium(IV), a Schiff base complex with 6,4,6-membered chelate rings

Coordination polyhedra of eight-coordinate zirconium complexes and a network built up by crisscross Cl...Cl contacts

“…(Table 2), respectively, provide further evidence for the distortion of the dodecahedral coordination geometry in (2). The Zr-N and Zr-O bond lengths of (2) do not show particular differences from the crystal structures of (1) and other bis(salen)zirconium complexes [2,3,[5][6][7][8], while the bond angles of (2) have more or less decreased.…”

“…Although a number of crystal structures of bis(quadridentate)zirconium complexes with eight-coordination have been reported, the quadridentate ligands are limited to salen-type ligands with rigid backbones, either N,N¢-disalicylidene-1,2-phenylenediamino (dsp) [5,7,26] or N,N¢-disalicylidene-1,2-cyclohexylenediamino (dsd) [6], or N,N'-disalicylidene-2-hydroxyphenylmethanediamino (dshpm) [8]. The molecular structure of (1) is an example of a bis(salen)zirconium complex with an ethene backbone.…”

“…According to the ligands previously reported, eight-coordinate zirconium complexes can be divided into two categories: bis(quadridentate) and tetrakis(bidentate) chelate complexes. The former complexes are predominantly constructed with salen-type ligands [1][2][3][4][5][6][7][8] and the latter ones with b-diketonate [12,13], carboxylate [14,15] or monothiocarbamate ligands [16,17]. Compared to the varieties of four-and six-coordinate zirconium complexes reported in the literature, zirconium complexes with higher coordination numbers are rather monotonous, and the bis(quadridentate) eight-coordinate zirconium complexes are limited to salen-type chelates with few exceptions [18][19][20].…”

“…The continuing interest in eight-coordinate zirconium complexes is partly due to their potential application as components of coordination polymers [1][2][3][4], their coordination and structural chemistry [5][6][7][8], as well as ligand exchange and rearrangement properties [9][10][11]. According to the ligands previously reported, eight-coordinate zirconium complexes can be divided into two categories: bis(quadridentate) and tetrakis(bidentate) chelate complexes.…”

Bis(μ-2-{bis[(2-oxidobenzylidene)amino]methyl}phenolato)bis[(tetrahydrofuran)samarium(III)] tetrahydrofuran disolvate

“…For general reports on the tripodal ligand 2-bis-(salicylidieneamino)methylphenol, see: Nabulsi et al (1988); Achim et al (2001); Yu et al (1991); Snyder et al(1989); Chaudhuri et al (1998); Illingsworth et al (2002). For related structures, see: Howell et al (1998); Liu et al (1998); Dubé et al (1998).…”