7 research outputs found
On Measurement of Impulsive Strain
Get PDFひずみ計を用いて衝撃ひずみを測定することは広く行なわれているが,必ずしも精度良く行なわれているとは限らないようである.本文では筆者らの失敗も含めて測定技術上注意すべきであると思われる点について述べる
On Low Profile Load Cells
Get PDF1971年9月にヘーグ市で開かれた力と重力の測定に関する研究集会の空気などにっいて述べ，そこで報告した筆者らの背たけの低い荷重計に関する論文の内容について解説する
Coordination Nanosheets Based on Terpyridine–Zinc(II) Complexes: As Photoactive Host Materials
No full textPhotoluminescent
coordination nanosheets (CONASHs) comprising three-way
terpyridine (tpy) ligands and zinc(II) ions are created by allowing
the two constitutive components to react with each other at a liquid/liquid
interface. Taking advantage of bottom-up CONASHs, or flexibility in
organic ligand design and coordination modes, we demonstrate the diversity
of the tpy-zinc(II) CONASH in structures and photofunctions. A combination
of 1,3,5-tris[4-(4′-2,2′:6′,2″-terpyridyl)phenyl]benzene
(<b>1</b>) and Zn(BF<sub>4</sub>)<sub>2</sub> affords a cationic
CONASH featuring the bis(tpy)Zn complex motif (<b>1-Zn</b>),
while substitution of the zinc source with ZnSO<sub>4</sub> realizes
a charge-neutral CONASH with the [Zn<sub>2</sub>(μ-O<sub>2</sub>SO<sub>2</sub>)<sub>2</sub>(tpy)<sub>2</sub>] motif [<b>1-Zn</b><sub><b>2</b></sub><b>(SO</b><sub><b>4</b></sub><b>)</b><sub><b>2</b></sub>]. The difference stems from
the use of noncoordinating (BF<sub>4</sub><sup>–</sup>) or
coordinating and bridging (SO<sub>4</sub><sup>2–</sup>) anions.
The change in the coordination mode alters the luminescence (480 nm
blue in <b>1-Zn</b>; 552 nm yellow in <b>1-Zn</b><sub><b>2</b></sub><b>(SO</b><sub><b>4</b></sub><b>)</b><sub><b>2</b></sub>). The photophysical property also
differs in that <b>1-Zn</b><sub><b>2</b></sub><b>(SO</b><sub><b>4</b></sub><b>)</b><sub><b>2</b></sub> shows
solvatoluminochromism, whereas <b>1-Zn</b> does not. Photoluminescence
is also modulated by the tpy ligand structure. <b>2-Zn</b> contains
triarylamine-centered terpyridine ligand <b>2</b> and features
the bis(tpy)Zn motif; its emission is substantially red-shifted (590
nm orange) compared with that of <b>1-Zn</b>. CONASHs <b>1-Zn</b> and <b>2-Zn</b> possess cationic nanosheet frameworks
with counteranions (BF<sub>4</sub><sup>–</sup>), and thereby
feature anion exchange capacities. Indeed, anionic xanthene dyes were
taken up by these nanosheets, which undergo quasi-quantitative exciton
migration from the host CONASH. This series of studies shows tpy-zinc(II)
CONASHs as promising potential photofunctional nanomaterials
