The uptake by plants of polymaleic acid: A polycarboxylic acid structurally related to those of soils

1978 ◽  
Vol 50 (1-3) ◽  
pp. 625-632 ◽  
Author(s):  
D. J. Linehan
Keyword(s):  
Polycarboxylic Acid ◽  
Polymaleic Acid

scholarly journals Metal(II) Coordination Polymers from Tetracarboxylate Linkers: Synthesis, Structures, and Catalytic Cyanosilylation of Benzaldehydes

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 204
Author(s):  
Yu Li ◽  
Chumin Liang ◽  
Xunzhong Zou ◽  
Jinzhong Gu ◽  
Marina V. Kirillova ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Polycarboxylic Acid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Trimethylsilyl Cyanide ◽  
Effect Of Solvent ◽  
Highly Active ◽  
Solvent Type ◽  
Metal Organic ◽  
Chloride Salts

Three 2D coordination polymers, [Cu2(µ4-dpa)(bipy)2(H2O)]n∙6nH2O (1), [Mn2(µ6-dpa)(bipy)2]n (2), and [Zn2(µ4-dpa)(bipy)2(H2O)2]n·2nH2O (3), were prepared by a hydrothermal method using metal(II) chloride salts, 3-(2′,4′-dicarboxylphenoxy)phthalic acid (H4dpa) as a linker, as well as 2,2′-bipyridine (bipy) as a crystallization mediator. Compounds 1–3 were obtained as crystalline solids and fully characterized. The structures of 1–3 were established by single-crystal X-ray diffraction, revealing 2D metal-organic networks of sql, 3,6L66, and hcb topological types. Thermal stability and catalytic behavior of 1–3 were also studied. In particular, zinc(II) coordination polymer 3 functions as a highly active and recoverable heterogeneous catalyst in the mild cyanosilylation of benzaldehydes with trimethylsilyl cyanide to give cyanohydrin derivatives. The influence of various parameters was investigated, including a time of reaction, a loading of catalyst and its recycling, an effect of solvent type, and a substrate scope. As a result, up to 93% product yields were attained in a catalyst recoverable and reusable system when exploring 4-nitrobenzaldehyde as a model substrate. This study contributes to widening the types of multifunctional polycarboxylic acid linkers for the design of novel coordination polymers with notable applications in heterogeneous catalysis.

Four 3D Co(ii) MOFs based on 2,4,6-tris(4-pyridyl)-1,3,5-triazine and polycarboxylic acid ligands and their derivatives as efficient electrocatalysts for oxygen reduction reaction

2021 ◽  
Vol 50 (14) ◽  
pp. 4904-4913
Author(s):  
Ming-Xing Yang ◽  
Li-Juan Chen ◽  
Yan-Zhu Ye ◽  
Xing-Ye Lin ◽  
Shen Lin
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Polycarboxylic Acid

Four 3D Co(ii) MOFs based on 2,4,6-tris(4-pyridyl)-1,3,5-triazine and polycarboxylic acid ligands and their derivatives as efficient electrocatalysts for the oxygen reduction reaction.

Polycarboxylic acid nanoparticles for ophthalmic drug delivery: anex vivoevaluation with human cornea

2004 ◽  
Vol 21 (8) ◽  
pp. 841-855 ◽  
Author(s):  
T. K. De ◽  
E. J. Bergey ◽  
S. J. Chung ◽  
D. J. Rodman ◽  
D. J. Bharali ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Human Cornea ◽  
Polycarboxylic Acid ◽  
Ophthalmic Drug Delivery ◽  
Ophthalmic Drug

scholarly journals Chelation and Metal-Ion Complex Formation of Chitosan Treated Cotton

2019 ◽  
Vol 8 (3) ◽  
pp. 93-100 ◽  
Author(s):  
Sudirman Habibie
Keyword(s):  
Cotton Fabric ◽  
Metal Ion ◽  
Chelating Agents ◽  
Transition Metal Ions ◽  
Cotton Fabrics ◽  
Carboxyl Groups ◽  
Polycarboxylic Acid ◽  
Salt Solutions ◽  
Polycarboxylic Acids ◽  
Zinc Salts

Chitin dan chitosan adalah bahan “chelate” yang sangat kuat untuk ion transisi logam terutama tembaga, nikel dan merkuri, dan sifat-sifat ini yang akan intensif di bahas. Pada studi ini kain kapas (cotton) dikerjakan dengan larutan chitosan-asam polikarboksilat untuk memperoleh kain kapas-chitosan yang mengandung gugus group karboksilat (-COOH) dan gugus amina (-NH2) fungsional. Penggunaan asam polykarboksilat (asam sitrat dan maleik) pada pelarutan chitosan menghasilkan group karboksil 0,5 meqs/g pada kain yang dicelup dengan larutan chitosan asam karboksilat. Kemudian kain kapas yang telah mengandung gugus karboksilat dan gugus amina ini dicelupkan pada larutan garam logam (garam tembaga dan seng). Terbukti bahwa larutan garam tembaga (copper) memberikan warna biru pada kain, hal ini mengindikasikan telah terjadi reaksi kompleks atau “Chelate”. Implikasi dari hasil ini maka diperkirakan kandungan group karboksil dan amina ini akan mempengaruhi pada pencelupan kain, namun hal ini tidak diuji.Kata kunci : Chitosan, Kain Kapas, Chelate, Asam asetat, Asam citrate, Asam maleik, Tembaga sulphate, Tembaga acetate.AbstractChitin and chitosan are powerfull chelating agents for transition metal ions, particularly copper, nickel and mercury, and these properties have been extensively reviewed. In this study, cotton fabric has been treated with chitosan- polycarboxylic acid solution to form chitosan treated cotton fabric containing carboxyl (-COOH) and amine (-NH2) functional groups. The use of polycarboxylic acids (citric and maleic acids) to dissolve chitosan has given carboxyl groups 0.5 meqs/g into chitosan treated cotton fabrics. Instead, the complexing of the treated cotton samples with copper and zinc salts was examined. The copper salt solutions gave blue fabrics confirming easily that complexing or chelation had occurred. There are implications for dyeing cotton making use of these groups but this was not investigated.Keyword : Chitosan, Cotton fabric, Chelation, Acetic acid, Citric acid, Maleic acid, Copper (II) sulphate, Copper (II) acetate.

scholarly journals Preparation of polycarboxylic acid-functionalized silica supported Pt catalysts and their applications in alkene hydrosilylation

RSC Advances ◽  
2018 ◽  
Vol 8 (36) ◽  
pp. 20379-20393 ◽  
Author(s):  
Dongyun Shao ◽  
Youxin Li
Keyword(s):  
Silica Gel ◽  
Pt Catalysts ◽  
Functionalized Silica ◽  
Polycarboxylic Acid ◽  
Supported Pt Catalysts ◽  
Aminopolycarboxylic Acid

Three novel Pt catalysts were prepared by loading Pt onto aminopolycarboxylic acid functionalized silica gel and were used in alkene hydrosilylation.

Effect of hyperbranched polycarboxylic acid superplasticizer on properties and microstructure of cement paste

2021 ◽  
pp. 1-29
Author(s):  
Qisheng Wu ◽  
Bin Gu ◽  
Yin Liu ◽  
Zichen Huang ◽  
Qiujing Chen ◽  
...  
Keyword(s):  
Cement Paste ◽  
Polycarboxylic Acid

scholarly journals Research and Application of Polycarboxylic Acid Water Reducer with Different Molecular Weight

2020 ◽  
Vol 179 ◽  
pp. 01021
Author(s):  
Bobo Liu ◽  
Kangjian Yu ◽  
Yinggang Yang ◽  
Donghui Miao ◽  
Chong He
Keyword(s):  
Molecular Weight ◽  
Polyethylene Glycol ◽  
Reducing Agent ◽  
Acid Water ◽  
Low Molecular Weight ◽  
High Grade ◽  
Polycarboxylic Acid ◽  
Different Molecular Weight

In this paper, a polycarboxylic water reducing agent was synthesized by using Methylallyl polyethylene glycol (HPEG) with molecular weight of 1200, 2400, 2800 and 3400 under the same conditions, C80 concrete tests were performed on these four molecular weight superplasticizers, verify the effect of different molecular weight polycarboxylic acid water reducer in C80 pumping concrete, finally, a kind of low molecular weight polycarboxylic acid water reducer with viscosity reducing effect in high-grade concrete is obtained, which can promote pumping of high-grade concrete.

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