2 research outputs found
An Unprecedented M–O Cluster Constructed from Nanosized {[C<sub>5</sub>NH<sub>5</sub>]<sub>9</sub>[H<sub>31</sub>Mo<sup>V</sup><sub>12</sub>O<sub>24</sub>Co<sup>II</sup><sub>12</sub>(PO<sub>4</sub>)<sub>23</sub>(H<sub>2</sub>O)<sub>4</sub>]}<sup>2–</sup> Anions Exhibiting Interesting Nonlinear-Optical Properties
Full text linkA novel high-nuclear
nanosized cluster modified by conjugated organic ligands (pyridine
and imidazole), [C<sub>5</sub>NH<sub>5</sub>]<sub>8</sub>Â[C<sub>3</sub>H<sub>5</sub>N<sub>2</sub>]<sub>2</sub>Â{[C<sub>5</sub>NH<sub>5</sub>]<sub>9</sub>​Â[H<sub>31</sub>Mo<sub>12</sub>O<sub>24</sub>Co<sub>12</sub>​Â(PO<sub>4</sub>)<sub>23</sub>Â(H<sub>2</sub>O)<sub>4</sub>]}·12H<sub>2</sub>O (<b>1</b>), has been successfully isolated under hydrothermal conditions
and structurally characterized. Compound <b>1</b> consists of
12 Co<sup>II</sup> and 12 Mo<sup>V</sup> ions linked by 23 {PO<sub>4</sub>} groups, exhibiting unprecedented nanosized ship-shaped clusters.
The magnetic measurements reveal that compound <b>1</b> exhibits
dominant antiferromagnetic interactions. Additionally, pyridine and
imidazole ligands enhance the delocalized electron effects of clusters,
and the third-order nonlinear-optical response of compound <b>1</b> is excellent
l- and d‑[LnZn(IN)<sub>3</sub>(C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>)]<sub><i>n</i></sub> (Ln = Eu, Sm, and Gd): Chiral Enantiomerically 3D 3d–4f Coordination Polymers Constructed by Interesting Butterfly-like Building Units and −[Ln-O-Zn]<sub><i>n</i></sub>– Helices
Full text linkA total
of six three-dimensional chiral coordination compounds l-
and d-[LnZnÂ(IN)<sub>3</sub>Â(C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>)]<sub><i>n</i></sub> (Ln = Eu, Sm, and Gd;
HIN = isonicotinic acid) have been successfully synthesized under
hydrothermal conditions without any chiral auxiliary and characterized
by IR, TG, elemental analyses, and solid-state circular dichroism
spectra. The structures of <b>1</b>–<b>6</b> were determined
by single-crystal X-ray structural analysis, which shows that l-[LnZnÂ(IN)<sub>3</sub>Â(C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>)]<i><sub>n</sub></i> (Ln = Eu (<b>1</b>),
Sm (<b>2</b>), and Gd (<b>3</b>)) crystallize in space
group <i>P</i>6<sub>5</sub>22 and are levogyrate. The chiral frameworks of l-[LnZnÂ(IN)<sub>3</sub>(C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>)]<sub><i>n</i></sub> are constructed from l-helical
Ln-O-Zn cluster chains, while adjacent l-type helical −[Ln-O-Zn]<sub><i>n</i></sub>– chains are connected through IN<sup>–</sup> ligands. d-[LnZnÂ(IN)<sub>3</sub>Â(C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>)]<sub><i>n</i></sub> (Ln
= Eu (<b>4</b>), Sm (<b>5</b>), and Gd (<b>6</b>)) crystallize in space group <i>P</i>6<sub>1</sub>22,
and their chiral frameworks consist of d-helical Ln-O-Zn
cluster chains. The observed second-harmonic generation efficiencies
of [EuZnÂ(IN)<sub>3</sub>Â(C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>)]<sub><i>n</i></sub>, [SmZnÂ(IN)<sub>3</sub>Â(C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>)]<sub><i>n</i></sub>,
and [GdZnÂ(IN)<sub>3</sub>Â(C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>)]<sub><i>n</i></sub> are 0.4, 0.3, and 0.3 times that
of urea, respectively. We also studied luminescence spectra and luminescence
lifetimes of <b>1</b> and <b>2</b>. The luminescence lifetimes
of <b>1</b> and <b>2</b> are 1.18 ms, and 29.6 μs,
respectively
