Reactions of [(Me3Si)3CAlMe2] with substituted benzoic acids. Isolation of a rare organoalumoxane carboxylate

New Understanding on Regulating the Crystallization and Morphology of the β-Polymorph of Isotactic Polypropylene Based on Carboxylate–Alumoxane Nucleating Agents

“…These structures are in excellent accordance with the complexes reported elsewhere. 27,38,39 Hence, it may be concluded that the p-n-alkylsubstituted benzoate−alumoxanes reported here would have a similar structure like that of p-methybenzoate−alumoxanes. The X-ray patterns (Figure 1b) indicate these samples to be crystalline and having a major peak in the (2θ) range of 4−8.5°.…”

“…In addition, the spectrum also shows the formation of oxo-centered trinuclear aluminum complex with bridging carboxylate ligands (Supporting Information, part B1 in Figure S1). These structures are in excellent accordance with the complexes reported elsewhere. ,, Hence, it may be concluded that the p - n- alkyl-substituted benzoate–alumoxanes reported here would have a similar structure like that of p- methybenzoate–alumoxanes. The X-ray patterns (Figure b) indicate these samples to be crystalline and having a major peak in the (2θ) range of 4–8.5°.…”

The role of the molecular structure of carboxylate-alumoxanes in the enhanced nucleation of polypropylene

“…11,12 Carboxylate-alumoxanes are more specifically considered to be alumina particles of 5-200 nm in diameter where the surface is covered by many covalently bonded carboxylate groups. 12,13 However, there are many variants like the oxo-centred trinuclear aluminium carboxylate 14,15 and the simplest one recently reported by Kalita et al 16 where carboxylate groups and an oxo ligand bridge the aluminium centres. US6369183 describes the preparation of polymer composites, hybrid polymers and resins based on carboxylate-alumoxanes which are chemically bonded to the polymer backbone.…”

“…The aluminium centres in the dinuclear complex are bridged by two PTBBA ligands and the oxo ligand to give a bicyclic structure similar to that of the reported complex [(Me 3 Si) 3 -CAl(m-O)(m-Hdtbsa)] 2 (where Hdtbsa -di-tert-butylsalicylate). 16 The fourth coordination site is occupied by the unidentate PTBBA ligand. The energy optimization of the structures using the Turbomole 6.4 suite of programs shows that the phenyl groups are coplanar with the carboxylate moiety, perhaps to gain enough resonance stabilization energy.…”

Crystal structure of bis(μ2-triphenylacetato-κO:κO′)bis(diisobutylaluminium)

“…According to the Cambridge Structural Database (CSD, Version 5.40 with updates, Groom et al, 2016) Dickie et al, 2004), aryl = 2,4,6-iPr 3 C 6 H 2 (JEFXEY; ; R = R 0 = tert-butyl and aryl = Ph (RITQUG; Bethley et al, 1997), aryl = 2-NMe 2 C 6 H 4 (MIJZEK; Branch et al, 2001), and R = Me, R 0 = C(SiMe 3 ) 3 and aryl = 4-MeC 6 H 4 (OXUZUD; Kalita et al, 2011). Two complexes with several Al 2 O 4 C 2 skeleton fragments, containing 2,2 0 -O 2 C-C 6 H 4 -C 6 H 4 -CO 2 dicarboxylate ligands have R = Et (RUJCIJ; two fragments) and R = isobutyl (iBu) (RUJCOP; three fragments) (Ziemkowska et al, 2009).…”