Copper/sodium-directed hydrolytic condensation of methyltriethoxysilane: Self-assembly of polyhedral Cu/Na-methylsiloxane. Synthesis and properties of new stereoregular macrocyclosiloxane

Synthesis of a 12-membered cyclic siloxane possessing alkoxysilyl groups as a nanobuilding block and its use for preparation of gas permeable membranes

“…Please note that the arrangement of side groups against the 12-membered ring plane switches every three Si-O bonds. The intensity ratio of the 29 Si NMR signals ((A + B) : C : D ¼ 12 : 4 : 8) is consistent with the structure. § These results strongly suggest that the alkoxysilylation of Cu 4 Na 4 (MeSiO 2 ) 12 $x(nBuOH)$yH 2 O proceeds with the retention of the 12-membered ring structure, including the up-and-down arrangement of side groups.…”

“…The signal arising from the -SiMe groups broadened with reaction time. The signal broadening is also conrmed by the 29 Si NMR data (next paragraph). Fig.…”

“…Characterization of 12MR-Me-TES Fig. 1a shows the 29 Si NMR spectrum of 12MR-Me-TES. The two T 3 signals (Fig.…”

Heptanuclear Cage CuII‐Silsesquioxanes: Synthesis, Structure and Catalytic Activity

“…Two types of “globular” Cu,Na‐silsesquioxanes [bearing phenyl, , (Figure , left) or methyl (Figure , right) substituents at the silicon atoms] were chosen as a starting material for the interaction with rodlike N,N spacers because of the convenient location of external (sodium) metal ions at equivalent positions. Thus, we expected the possible formation of a 1D or 2D coordination polymer structure depending on the “cage/spacer” ratio.…”

Modern concepts and methods in the chemistry of polyhedral metallasiloxanes

“…Compounds bearing Co, Ni, Cu, La, Nd, Gd, and Dy ions as well as alkali metals were first synthesized before 2007, and they have been discussed previously [61]. More recently, novel Cu,Na-PHMS [71][72][73], Cu,Li-PHMS [74], and Cr,Na-PHMS [75] compounds were obtained. A high diversity of structural forms has been reported for these compounds in addition to the traditional prismatic structures, such as sophisticated constructions of Fe,Na-PHMS (Fig.…”