Reversible capping/uncapping of phosphorous-centered Keggin-type polyoxoniobate clusters.
نویسندگان
چکیده
Caps in α-Keggin-type polyoxometalates [PM2Nb12O40](9-) (M: Nb[double bond, length as m-dash]O or V[double bond, length as m-dash]O) can be removed in basic condition to produce uncapped [PNb12O40](15-). Transmetalation or capping occurs from the reaction of [PNb14O42](9-) or [PNb12O40](15-) with either Sb2O3 or V2O5 to form [PSb2Nb12O40](9-) or [PV2Nb12O42](9-), respectively.
منابع مشابه
Polyoxoniobate-based 3D framework materials with photocatalytic hydrogen evolution activity.
Two phosphoniobate-based 3D frameworks were firstly constructed using the hexa-capped Keggin polyoxoniobates [PNb12O40(VO)6](3-) and copper cations. Photocatalytic studies indicated that the hybrid materials exhibit photocatalytic hydrogen evolution activity.
متن کاملImportance of free actin filament barbed ends for Arp2/3 complex function in platelets and fibroblasts.
We investigated the effect of actin filament barbed end uncapping on Arp23 complex function both in vivo and in vitro. Arp23 complex redistributes rapidly and uniformly to the lamellar edge of activated wild-type platelets and fibroblasts but clusters in marginal actin filament clumps in gelsolin-null cells. Treatment of gelsolin-null platelets with the negative dominant N-WASp C-terminal CA do...
متن کاملThe KEOPS Complex: A Rosetta Stone for Telomere Regulation?
The detailed mechanisms underlying telomere capping and its relationship to telomerase activity are still unclear, although many proteins have been implicated in either or both processes. In this issue of Cell, the surprising identification of a new complex, called KEOPS, which promotes both telomere uncapping and elongation is presented.
متن کاملAntimony-dependent expansion for the Keggin heteropolyniobate family.
Nine new Sb-bicapped α-Keggin-type heteropolyoxoniobates (HPNb) were synthesized under hydrothermal conditions. Among them, the As-centered HPNb was never reported before, and the two dimer compounds are the biggest isolated HPNbs at present.
متن کاملMrc1 protects uncapped budding yeast telomeres from exonuclease EXO1
Mrc1 (Mediator of Replication Checkpoint 1) is a component of the DNA replication fork machinery and is necessary for checkpoint activation after replication stress. In this study, we addressed the role of Mrc1 at uncapped telomeres. Our experiments show that Mrc1 contributes to the vitality of both cdc13-1 and yku70Delta telomere capping mutants. Cells with telomere capping defects containing ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Chemical communications
دوره 51 8 شماره
صفحات -
تاریخ انتشار 2015