Synthesis and catalytic behavior of tetrakis(4-carboxyphenyl) porphyrin-periodic mesoporous organosilica

Periodic Mesoporous Organosilica with a Basic Urea‐Derived Framework for Enhanced Carbon Dioxide Capture and Conversion Under Mild Conditions

“…The 29 Si magic-angle spinning( MAS) NMR spectrum showedt hree major signals centered at d = À110, À102, and À65 ppm, which correspond to the Si species of Q 4 [( SiO) 4 Si], Q 3 [( SiO) 3 Si(OR)] (R = Et or H), and the T 3 resonance from Si species attached to an organic group [ÀCH 2 ÀSi(OSi ) 3 ], respectively. [20] The spectrumd id not displaya ny other signals, which verified the complete integration of the organic precursor into the silica framework through the hydrolysis of terminal alkoxysilanes.…”

Lanthanide complex-incorporated periodic mesoporous organosilica nanospheres with tunable photoluminescence

“…As shown in Fig. 61 The T n -type silicon species observed at d ¼ À64.9 and À57.1 ppm can be assigned to the silicon resonances of completely condensed CSi(SiO) 3 (T 3 ) and of partially condensed CSi(SiO) 2 (OH) (T 2 ), respectively, revealing the integration of the functional organic groups into the pore walls. For the Q n -type silicon species, three signals at d ¼ À109.2, À100.2, and À91.2 ppm are assigned to the silicon resonances of Si(OSi) 4 (Q 4 ), HOSi(OSi) 3 (Q 3 ), and (HO) 2 Si(OSi) 2 (Q 2 ), respectively, showing a complete or partial condensation of pure silicon species of the mesoporous silica framework.…”

A Vanadyl Complex Grafted to Periodic Mesoporous Organosilica: A Green Catalyst for Selective Hydroxylation of Benzene to Phenol

“…Parijat Borah, Xing Ma, Kim Truc Nguyen, and Yanli Zhao* Dedicated to Professor Sir Fraser Stoddart on the occasion of his 70th birthday Design of catalytically active periodic mesoporous organosilica (PMO) is a novel strategy for transforming a catalytically important transition-metal complex into a heterogeneous catalyst. [1] Vanadyl(IV) acetylacetonate, [VO(acac) 2 ], is an important homogeneous catalyst widely used for various organic transformations. [2] The immobilization of the [VO-(acac) 2 ] complex onto silica gels, mesoporous silicas, and alumina has been achieved through a wet impregnation process followed by the calcination.…”