scholarly journals A pseudo-icosahedral cage {Gd12} based on aminomethylphosphonate

2016 ◽  
Vol 45 (22) ◽  
pp. 9041-9044 ◽  
Author(s):  
Ze-Min Zhang ◽  
Karzan H. Zangana ◽  
Andreas K. Kostopoulos ◽  
Ming-Liang Tong ◽  
Richard E. P. Winpenny
Keyword(s):  
Magnetocaloric Effect ◽  
Phosphonic Acid ◽  
Solvothermal Conditions ◽  
Aminomethyl Phosphonic Acid

Reaction of (aminomethyl)phosphonic acid (ampH2) with a mixture of gadolinium and cobalt pivalates under solvothermal conditions, led to a pseudo-icosahedral cage {Gd12}, which shows a large magnetocaloric effect (MCE).

Determination of Glyphosate Herbicide and (Aminomethyl)phosphonic Acid in Natural Waters by Liquid Chromatography Using Pre-Column Fluorogenic Labeling with 9-Fluorenylmethyl Chloroformate

1986 ◽  
Vol 69 (3) ◽  
pp. 458-461 ◽  
Author(s):  
Carl J Miles ◽  
Louis R Wallace ◽  
H Anson Moye
Keyword(s):  
Liquid Chromatography ◽  
Phosphonic Acid ◽  
Natural Waters ◽  
Sample Pretreatment ◽  
Fluorescence Detector ◽  
Rotary Evaporation ◽  
Glyphosate Herbicide ◽  
And Storage ◽  
Aminomethyl Phosphonic Acid

Abstract An analytical method has been developed for determination of glyphosate herbicide and its major metabolite, (aminomethyl)phosphonic acid (AMFA), in natural waters. Sample pretreatment consisted of filtration, addition of phosphate buffer, concentration by rotary evaporation, and a final filtration before derivatization with 9-fluorenylmethyl chloroformate. The derivatives were separated by anion exchange liquid chromatography and measured with a fluorescence detector. Standard curves were linear over 3 orders of magnitude and minimal detectable quantities were 10 ng/mL for glyphosate and 5 ng/mL for AMPA. The 20-fold concentration factor realized in sample preparation corresponds to ppb method detection limits for glyphosate and AMPA in natural waters. Recovery and storage studies were performed and are discussed.

Evaluation of Titanium Dioxide as a Binding Phase for the Passive Sampling of Glyphosate and Aminomethyl Phosphonic Acid in an Aquatic Environment

2015 ◽  
Vol 87 (12) ◽  
pp. 6004-6009 ◽  
Author(s):  
Vincent Fauvelle ◽  
Tran-Thi Nhu-Trang ◽  
Thibaut Feret ◽  
Karine Madarassou ◽  
Jérôme Randon ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Phosphonic Acid ◽  
Aquatic Environment ◽  
Passive Sampling ◽  
Binding Phase ◽  
Aminomethyl Phosphonic Acid

Mn(II)2Gd(III)3 Phosphonate as a Molecular Refrigerant

2015 ◽  
Vol 68 (12) ◽  
pp. 1926 ◽  
Author(s):  
Xiaoyan Tang ◽  
Ye Xu ◽  
Wenpeng Ye ◽  
Yan Tang ◽  
Yunsheng Ma ◽  
...  
Keyword(s):  
Magnetocaloric Effect ◽  
Phosphonic Acid ◽  
Planar Structure ◽  
Magnetic Studies ◽  
Tert Butyl ◽  
Potential Applications ◽  
Pentanuclear Cluster

3d-Gd phosphonate clusters are attractive for their potential applications as magnetic coolers. A new pentanuclear cluster [Mn(II)2Gd(III)3(OH)(dtbmfPO3)2(tBuCO2)8(HO2CtBu)(H2O)2]·HO2CtBu·CH3CN (1) (dtbmfPO3H2 = (2,7-di-tert-butyl-9-methyl-9H-fluoren-9-yl)phosphonic acid) has been synthesised and characterised. The cluster has a planar structure in which the trinuclear {MnGd2(OH)} and dinuclear {MnGdO2} units are joined together by two phosphonate groups. The magnetic studies reveal that 1 shows antiferromagnetic interactions and a large magnetocaloric effect (ΔS = 20.9 J kg–1 K–1 at ΔH = 7 T).

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