Electrochemistry and UV/visible spectroscopy of phosphino-substituted bis(η⁵-indenyl)iron(II) complexes

Six phosphino-functionalized diindenyl ferrocenes have been characterized by UV/vis spectroscopy and cyclic voltammetry in dichloromethane. The complexes contain the following ligands: 1-diphenylphosphino- (1), 1-diphenylphosphino-2-methyl- (2), 1-diphenylphosphino-3-methyl- (3), 1-diphenylphosphino-3-trimethylsilyl- (4), 1-diphenylphosphino-2,3-dimethyl- (5), and 1-diphenylphosphino-4,7-dimethyl-indenide (6). The cyclic voltammetry shows an approximately additive relationship between oxidation potential and the type of substituent and its ring position, but with increasing substitution leading to lower than otherwise expected oxidation potentials. The UV/vis spectra show two absorptions with the low energy band moving to lower energy with increasing substitution on the C₅ ring

Ionic liquid-templated synthesis of 10-MR zeolites and its origin disclosure

Ionic liquids (ILs) have been used as the template/structure-directing agent (SDA) for the synthesis of crystalline materials, including aluminophosphates, metal-organic frameworks (MOFs), and covalent organic frameworks (COFs). This work unravels the structure-directing role of the imidazolium in ILs in 10-membered-ring zeolite synthesis. Herein, we report the key IL structure-dependent parameters affecting the synthesis of TON and MFI zeolites with one-dimensional (1D) and three-dimensional (3D) channel structures, respectively. The imidazolium dictates the resulting zeolite type and the morphologies of the TON and MFI zeolites are predominantly influenced by both the cations and the silica sources. The structure-directing properties of ILs are supported by the lowered energy state determined by density functional theory (DFT) calculations