Sodium cubane and double-cubane aggregates of hybridised salicylaldimines and their transmetallation to nickel for catalytic ethylene oligomerisation

Abstract

Deprotonation of functional salicylaldimines with NaH invariably results in cubane or double-cubane Na(I) aggregates which transmetallate with Ni(II) under different stoichiometric conditions to give Ni(II) complexes that are catalytically active towards ethylene oligomerisation.

The role of π–π stacking and hydrogen-bonding interactions in the assembly of a series of isostructural group IIB coordination compounds

“…In this form, L can act as a monodentate ligand, where it is coordinated to the metal ion via the phenolate O atom. It should be noted that at basic pH, the L ligand may act as a tridentate ligand through the imine N, phenolate O and methoxy O atoms (Gong et al, 2014;Song et al, 2013;Reddy et al, 2003a).…”

“…The ligand 2-{[(2-methoxyphenyl)imino]methyl}phenol (L) was utilized previously for the preparation of a number of coordination compounds (Song et al, 2013;Gong et al, 2014;Reddy et al, 2003a,b;Li & Yuan, 2012). L was synthesized by reacting 2-hydroxybenzaldehyde (0.53 ml, 5 mmol) with 2-methoxyaniline (0.56 ml, 5 mmol) in ethanol.…”

Alkali Metallosilicates: Synthesis, Structure and Evaluation in the ROP of ϵ‐Caprolactone

“…This compound crystallizes in the trigonal space group R3c, with whole A similar tetrameric core is observed in other sodium derivatives. [38][39][40][41][42] The free silanol tBu LH is linked to the tetrameric metallosilicate 5 via SiÀ OH•••O hydrogen bond with an O•••O distance of 3.007(9) Å. The molecular structure of 5• tBu LH is displayed in Figure 3, while selected bond lengths and angles are presented in Table 2.…”

“…10) Å] in 8 are similar to those reported for some sodium phenolate complexes. [39,41,43,44] In both compounds, there are two types of coordination environments for the sodium cations. For compounds 9 and 10, single crystals suitable for X-ray diffraction analysis were obtained by a slow evaporation of a THF solution in a glove-box.…”

Different coordination modes of trans-2-{[(2-methoxyphenyl)imino]methyl}phenoxide in rare-earth complexes: influence of the metal cation radius and the number of ligands on steric congestion and ligand coordination modes

“…However, the structures of these liagnds are more complicated than that of the (E)-2-{[(2-methoxyphenyl)imino]methyl}phenoxide anion. Surprisingly, reported crystal structures of closely related rare-earth complexes with this potentially tridentate ligand and with its substituted derivatives are limited to two complexes: Yousaf et al, 2000; the interligand dihedral angle is 43.3 ) and Song et al, 2013;4.0, 7.7, 8.9 and 19.9 ) and Na 4 ( 3 -O: Lu et al, 2012;4.3, 15.8, 16.0, 21.5, 43.0, 52.7, 60.9 and 65.7 for both crystallographically independent molecules) possessing an Na 4 O 4 cubic core. Interligand interactions are less pronounced in BEPBOP, whereas the The molecular structure of (5).…”