Role of aromatic dicarboxylates in the structural diversity of cobalt(ii) and copper(ii) coordination polymers containing a flexible N,N′-di(3-pyridyl)octanediamide ligand

CrystEngComm ◽  
2013 ◽  
Vol 15 (36) ◽  
pp. 7274 ◽  
Author(s):  
Xiu-Li Wang ◽  
Fang-Fang Sui ◽  
Hong-Yan Lin ◽  
Chuang Xu ◽  
Guo-Cheng Liu ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Structural Diversity

Silver(i) coordination polymers based on halogenated cyanoformamidine: roles of oxyanions and halogen atoms in the structural diversity

CrystEngComm ◽  
2021 ◽  
Vol 23 (9) ◽  
pp. 1961-1968
Author(s):  
Fu-Hung Cheng ◽  
Yu-Hsiang Liu ◽  
Wei-Te Lee ◽  
Ji-Hong Hu ◽  
Hui-Ling Hu ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Structural Diversity ◽  
Halogen Atoms

Halogen substituents on cyanoformamidine ligands and oxyanions affect the structures of complexes due to differences in their electronegativity and volume.

scholarly journals Structural Diversity of Six Coordination Polymers Based on the Designed X-Shaped Ligand 1,1,1,1-Tetrakis[(3-pyridiniourea)methyl]methane

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2292 ◽  
Author(s):  
Qi-Long Zhang ◽  
Qing Yu ◽  
Hai-Fang Xie ◽  
Bo Tu ◽  
Hong Xu ◽  
...  
Keyword(s):  
Metal Ions ◽  
Single Crystal ◽  
Diffraction Analysis ◽  
Coordination Polymers ◽  
Chain Complex ◽  
Structural Diversity ◽  
Structural Comparison ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Loop Chain

In this study, six coordination polymers (CPs), {[Ag2(L)(CF3SO3)]·CF3SO3·2H2O·DMF}n (1), {[Ag(L)]·SbF6·4DMF·H2O}n (2), {[Zn(L)0.5(I)2]·3.75H2O}n (3), {[Cd2(L)(I)4(H2O)(DMF)]·4H2O·3DMF}n (4), {[Hg2(L)(I)4]·H2O·4DMF}n (5) and {[Hg2(L)(Cl)4]·2H2O·3DMF}n (6), were obtained based on the designed X-shaped urea-based ligand. X-ray single crystal diffraction analysis revealed that complex 1 displayed a 3D (3,4)-connected {6·82}{64·82}-tcj net. Complex 2 featured a 2D 4-connected {43·63} sheet. Complexes 3 and 5 exhibited a 1D polymeric loop chain. Complex 4 displayed a 1D polymeric fishbone chain. Complex 6 showed a 2D 4-connected {44·62}-sql sheet. Structural comparison revealed that not only the metal ions, but also the anions played crucial roles in the control of final structures.

The construction of Cu(i)/Cu(ii) coordination polymers based on pyrazine–carboxylate: Structural diversity tuned by in situ hydrolysis reaction

CrystEngComm ◽  
2013 ◽  
Vol 15 (26) ◽  
pp. 5359 ◽  
Author(s):  
Zhen-Zhen Wen ◽  
Xi-Ling Wen ◽  
Song-Liang Cai ◽  
Sheng-Run Zheng ◽  
Jun Fan ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Structural Diversity ◽  
Hydrolysis Reaction

Coordination polymers derived from a flexible bis(pyridylurea) ligand: conformational change of the ligand and structural diversity of the complexes

CrystEngComm ◽  
2011 ◽  
Vol 13 (1) ◽  
pp. 215-222 ◽  
Author(s):  
Yongjing Hao ◽  
Biao Wu ◽  
Shaoguang Li ◽  
Chuandong Jia ◽  
Xiaojuan Huang ◽  
...  
Keyword(s):  
Conformational Change ◽  
Coordination Polymers ◽  
Structural Diversity

scholarly journals A hidden catalysis: metal-, and organocatalyst-free one-pot assembly of chiral aza-tricyclic molecules containing six contiguous stereocenters

2020 ◽  
Author(s):  
Dung Do
Keyword(s):  
Chemical Space ◽  
Structural Diversity ◽  
Therapeutic Agents ◽  
Chiral Molecules ◽  
One Pot ◽  
Complex Molecules ◽  
Chiral Complex ◽  
Enamine Catalysis ◽  
Daunting Challenge

<p></p><p>Chiral molecules with their defined 3-D structures are of paramount importance for the study of chemical biology and drug discovery. Having rich structural diversity and unique stereoisomerism, chiral molecules offer a large chemical space that can be explored for the design of new therapeutic agents.<sup>1</sup> In practice, chiral architectures are usually prepared from organometallic and organocatalytic processes where a transition metal or an organocatalyst is tailor-made for a desired reaction. As a result, developing a method that enables rapid assembly of chiral complex molecules under a metal- and organocatalyst-free condition represents a daunting challenge. Here we developed a straightforward one-pot procedure to create a chiral 3-D structure from 2-D structures and an amino acid without any chiral catalyst. The center of this research is the design of a <a>special chiral spiroimidazolidinone cyclohexadienone intermediate</a>, a merger of a chiral reactive substrate with multiple nucleophillic/electrophillic sites and a transient organocatalyst. <a>This unique substrate-catalyst (“sub-catalyst”) dual role of the intermediate was displayed in its aza-Michael/Michael cascade reaction with an </a>α,β-unsaturated aldehyde under an iminium/enamine catalysis. <a>The enhanced co-ordinational proximity of the chiral substrate and catalyst</a> in the transition state resulted in a substantial steric discrimination and an excellent overall diastereoselectivity. Aza-tricylic molecules with six contiguous stereocenters were assembled from <i>N</i>-alkylated aminophenols, α,β-unsaturated aldehydes and chiral α-amino acids under a hidden “sub-catalysis” where the strategically produced “sub-catalyst” does not present in initial components of the reaction. The success of this methodology will pave the way for many efficient preparations of chiral complex molecules.</p><br><p></p>

Sign in / Sign up

Export Citation Format

Share Document