Synthesis of Large [2+3] Salicylimine Cages with Embedded Metal‐Salphen Units

Abstract

Metal salphen containing complexes have found a broad variety of applications in catalysis as well as material science. Most of these materials are either mono-nuclear complexes or polymeric network materials. Discrete macromolecular polynuclear salphens are still rare and mostly two-dimensional structures.Here we present three-dimensional trinuclear Ni(II)-and Pt(II)cage compounds with a covalently bound [2 + 3] salicylimine cage backbone. The solubility of the cages allowed their investigation by spectroscopic methods. Furthermore, the Pt(II) derivative was investigated by single crystal X-ray structure analysis revealing that the presented cage compounds possess the largest intrinsic void of metal salphen cages reported till date.

DFT stimulation and experimental insights of chiral Cu(ii)–salen scaffold within the pocket of MWW-zeolite and its catalytic study

“…Non-reacted ligands were extracted with acetone, and free Cu( ii ) ions were eliminated through ion-exchange with 0.1 M NaCl solution. The sample was then thoroughly washed with distilled water, and dried in air oven for 60 min to obtain the chiral Cu( ii )–salen complex encapsulated in MWW zeolite 47–52 (Scheme 1).…”

“…Nonreacted ligands were extracted with acetone, and free Cu(II) ions were eliminated through ion-exchange with 0.1 M NaCl solution. The sample was then thoroughly washed with distilled water, and dried in air oven for 60 min to obtain the chiral Cu(II)-salen complex encapsulated in MWW zeolite [47][48][49][50][51][52] (Scheme 1). FTIR (KBr): 3444, 2940, 2865, 1630, 1501, 1460, 1279, 1236, 1091, 808, 766, 661, 601, 558, 505, and 450 cm À1 ; BET results: 28.52 m 2 g À1 , surface area; 3.4 nm, average pore diameter; 0.16 cm 3 g À1 , pore volume.…”

Sustainable approach for the synthesis of chiral β-aminoketones using an encapsulated chiral Zn(ii)–salen complex

“…Thus, the resulting product is referred to as the Zn(II)-salen@MWW catalyst (Scheme 1). 4,[36][37][38][39][40]…”

N,N′-1,2-Phenylene-bis(3-tert-butylsalicylideneiminato)nickel (II)

“…Crystal structure determination is an important tool for the characterization of sterically hindered Schiff base complexes, because it provides valuable information on the impact of steric hindrance on the structure and properties of metal complexes. The structures of tert-butyl-substituted salophen complexes reported previously include relatively simple ortho-and para-di-tert-butyl-or ortho-tert-butyland other functional groups para-substituted complexes [19][20][21][22][23][24], di-tert-butyl-substituted crown ethers bearing complexes [25,26], as well as more sophisticated supramolecular structures [27][28][29][30][31][32]. The structures of complexes containing tert-butyl-substituents in the ortho-and para-positions of the phenyl rings of the ligand and various substituents the bridge, such as HOOC-, CH 3 -, CH 3 O-, N(CH 3 ) 2 -, have also been described [21,24,30,31].…”