Three metal complexes derived from 3-methyl-1H-pyrazole-4-carboxylic acid: synthesis, crystal structures, luminescence and electrocatalytic properties

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 52040-52047 ◽  
Author(s):  
Jing Liu ◽  
Mei-Ling Cheng ◽  
Li-Li Yu ◽  
Sheng-Chun Chen ◽  
Yong-Liang Shao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Carboxylic Acid ◽  
Metal Complexes ◽  
Crystal Structures ◽  
Acid Synthesis ◽  
Bifunctional Catalyst ◽  
Electrocatalytic Properties ◽  
Catalyst Complex

[Cd(HMPCA)2(H2O)4] (1), [Co(H2MPCA)2(DMF)2(H2O)2]Cl2(2), and [Cd3Cl2(HMPCA)4(H2O)2]·2H2O (3) have been synthesized. As a bifunctional catalyst, complex2exhibited excellent catalytic activity for OER and certain catalytic activity for ORR.

scholarly journals Crystal structures and Hirshfeld surface analysis of transition-metal complexes of 1,3-azolecarboxylic acids

2019 ◽  
Vol 75 (9) ◽  
pp. 1319-1326
Author(s):  
Natthaya Meundaeng ◽  
Timothy John Prior ◽  
Apinpus Rujiwatra
Keyword(s):  
Carboxylic Acid ◽  
Transition Metal ◽  
Metal Complexes ◽  
Crystal Structures ◽  
Surface Analysis ◽  
Transition Metal Complexes ◽  
Self Assembly ◽  
Hirshfeld Surface ◽  
Hirshfeld Surface Analysis ◽  
Single Crystal Structures

The crystal structures of five new transition-metal complexes synthesized using thiazole-2-carboxylic acid (2-Htza), imidazole-2-carboxylic acid (2-H2ima) or 1,3-oxazole-4-carboxylic acid (4-Hoxa), namely diaquabis(thiazole-2-carboxylato-κ2 N,O)cobalt(II), [Co(C4H2NO2S)2(H2O)2], 1, diaquabis(thiazole-2-carboxylato-κ2 N,O)nickel(II), [Ni(C4H2NO2S)2(H2O)2], 2, diaquabis(thiazole-2-carboxylato-κ2 N,O)cadmium(II), [Cd(C4H2NO2S)2(H2O)2], 3, diaquabis(1H-imidazole-2-carboxylato-κ2 N 3,O)cobalt(II), [Co(C4H2N2O2)2(H2O)2], 4, and diaquabis(1,3-oxazole-4-carboxylato-κ2 N,O 4)cobalt(II), [Co(C4H2NO3)2(H2O)2], 5, are reported. The influence of the nature of the heteroatom and the position of the carboxyl group in relation to the heteroatom on the self-assembly process are discussed based upon Hirshfeld surface analysis and used to explain the observed differences in the single-crystal structures and the supramolecular frameworks and topologies of complexes 1–5.

From 1D to 3D lanthanide coordination polymers constructed with pyridine-3,5-dicarboxylic acid: synthesis, crystal structures, and catalytic properties

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63425-63432 ◽  
Author(s):  
Xiao-Ming Lin ◽  
Ji-Liang Niu ◽  
Pei-Xian Wen ◽  
Yan-Na Lu ◽  
Lei Hu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Dicarboxylic Acid ◽  
Crystal Structures ◽  
Coordination Polymers ◽  
Catalytic Properties ◽  
Structural Difference ◽  
Acid Synthesis ◽  
Lanthanide Coordination Polymers ◽  
Lanthanide Contraction

Three series of lanthanide coordination polymers have been synthesized. The structural difference may be derived from the lanthanide contraction. Moreover, we also discussed the size-selective catalytic activity towards cyanosilylation of aldehydes.

First crystal structures of metal complexes with a 4-nitropyrazole-3-carboxylic acid ligand and the third crystal form of the ligand

2019 ◽  
Vol 75 (3) ◽  
pp. 255-264
Author(s):  
Željko K. Jaćimović ◽  
Sladjana B. Novaković ◽  
Goran A. Bogdanović ◽  
Gerald Giester ◽  
Milica Kosović ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Metal Ions ◽  
Metal Complexes ◽  
Crystal Structures ◽  
Crystal Form ◽  
Complex Iii ◽  
Binuclear Complexes ◽  
X Ray Diffraction ◽  
The Third ◽  
Coordination Ability

Pyrazole (pz)-derived ligands can, besides exhibiting a strong coordination ability toward different metal ions, exhibit a great diversity in their coordination geometry and nuclearity, which can be achieved by varying the type and position of the pz substituents. The present study reports the synthesis and crystal structure of two binuclear complexes, namely bis(μ-4-nitro-1H-imidazol-1-ide-5-carboxylato)-κ3 N 1,O:N 2;κ3 N 2:N 1,O-bis[aqua(dimethylformamide-κO)copper(II)], [Cu2(C4HN3O4)2(C3H7NO)2(H2O)2], (II), and bis(μ-4-nitro-1H-imidazol-1-ide-5-carboxylato)-κ2 N 1,O:N 2;κ2 N 2:N 1,O-bis[triaquacobalt(II)] dihydrate, [Co2(C4HN3O4)2(H2O)6]·2H2O, (III). These compounds represent rare examples of metal complexes comprising 3,4-substituted pz derivatives as a bridging ligand and also the first crystal structures of transition-metal complexes with ligands derived from 4-nitropyrazole-3-carboxylic acid. Recently, the crystal structures of the same ligand in the neutral and mixed neutral/anionic forms have been reported. We present here the third form of this ligand, where it is present in a fully deprotonated anionic form within a salt, i.e. ammonium 4-nitropyrazole-3-carboxylate, NH4 +·C4H2N3O4 −, (I). Single-crystal X-ray diffraction revealed that in the present complexes, the CuII and CoII centres adopt distorted square-pyramidal and octahedral geometries, respectively. In both cases, the N,N′,O-coordinated pz ligand shows simultaneously chelating and bridging coordination modes, leading to the formation of a nearly planar six-membered M 2N4 metallocycle. In all three crystal structures, the supramolecular arrangement is controlled by strong hydrogen bonds which primarily engage the carboxylate O atoms as acceptors, while the nitro group adopts the role of an acceptor only in structures with an increased number of donors, as is the case with CoII complex (III). The electrostatic potential, as a descriptor of reactivity, was also calculated in order to examine the changes in ligand electrostatic preferences upon coordination to metal ions.

scholarly journals Synthesis, crystal structures and biological activity of transition metal complexes of 2-phenyl-4-selenazole carboxylic acid

2010 ◽  
Vol 40 (10) ◽  
pp. 1525-1535 ◽  
Author(s):  
GuoLiang ZHAO ◽  
LinXiang SHAO ◽  
HuiDuo XIAN ◽  
JunPing ZHANG ◽  
JianFeng LIU ◽  
...  
Keyword(s):  
Biological Activity ◽  
Carboxylic Acid ◽  
Transition Metal ◽  
Metal Complexes ◽  
Crystal Structures ◽  
Transition Metal Complexes

Crystal Structure Studies towards the Synthesis and Applications of N-heterocyclic Carbene–Metal Complexes Derived from [2.2]Paracyclophane

2015 ◽  
Vol 68 (10) ◽  
pp. 1472 ◽  
Author(s):  
Wenzeng Duan ◽  
Yudao Ma ◽  
Yanmin Huo ◽  
Qingxia Yao
Keyword(s):  
Crystal Structure ◽  
Catalytic Activity ◽  
Metal Complexes ◽  
Single Crystal ◽  
Crystal Structures ◽  
Phenylboronic Acid ◽  
High Catalytic Activity ◽  
The Novel ◽  
Asymmetric Addition ◽  
Catalytic Activities

The crystal structures of six planar chiral N-heterocyclic carbene (NHC) precursors and one NHC–Rh complex derived from [2.2]paracyclophane were described. The NHC–metal complexes were prepared to examine their catalytic activities toward the Rh-catalyzed asymmetric addition of phenylboronic acid to 1-naphthaldehyde. The results were correlated to the single-crystal crystallographic studies. The novel NHC precursor 5 can achieve high catalytic activity in the asymmetric addition of phenylboronic acid to 1-naphthaldehyde.

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