In this paper,the nitrogen forms in newly-formed humic substances,including humic acid (HA),fulvic acid (FA) and humic acid in humin (HAI),were studied by using the ^15N CP-MAS NMR technique in combination with chemic...In this paper,the nitrogen forms in newly-formed humic substances,including humic acid (HA),fulvic acid (FA) and humic acid in humin (HAI),were studied by using the ^15N CP-MAS NMR technique in combination with chemical approaches.Results show that the majority of nitrogen in HA,FA and HAI was in the amide form with some presented as aliphatic and/ or aromatic amines and some as pyrrole type nitrogen,although the contents of nonhydrolyzable nitrogen in them differed greatly from each other (15-55%).展开更多
The NMR and FT\|IR Spectra of ten (ηC 6H\-9CRR′ Cp)\-2MCl\-2 (M=Ti,Zr) were measured.The constructions of the compounds were identified by 1H NMR and 13 C NMR spectra.All complexes are bonded by M\|Cp through center...The NMR and FT\|IR Spectra of ten (ηC 6H\-9CRR′ Cp)\-2MCl\-2 (M=Ti,Zr) were measured.The constructions of the compounds were identified by 1H NMR and 13 C NMR spectra.All complexes are bonded by M\|Cp through center of Cp.The vibration modes were reasonably assigned,absorption of ν s M\|Cp (A\-1) (M=Ti and Zr) vibration all appear in 310?cm -1 or so,while ν as M\|Cp (B) appear around 410?cm -1 and 360?cm -1 for Ti and Zr respectively.The influence of the center metal atoms and the substituents upon the NMR and FT\|IR spectra were discussed.展开更多
基金Project supported by the National Natural Science Foundation of China
文摘In this paper,the nitrogen forms in newly-formed humic substances,including humic acid (HA),fulvic acid (FA) and humic acid in humin (HAI),were studied by using the ^15N CP-MAS NMR technique in combination with chemical approaches.Results show that the majority of nitrogen in HA,FA and HAI was in the amide form with some presented as aliphatic and/ or aromatic amines and some as pyrrole type nitrogen,although the contents of nonhydrolyzable nitrogen in them differed greatly from each other (15-55%).
文摘The NMR and FT\|IR Spectra of ten (ηC 6H\-9CRR′ Cp)\-2MCl\-2 (M=Ti,Zr) were measured.The constructions of the compounds were identified by 1H NMR and 13 C NMR spectra.All complexes are bonded by M\|Cp through center of Cp.The vibration modes were reasonably assigned,absorption of ν s M\|Cp (A\-1) (M=Ti and Zr) vibration all appear in 310?cm -1 or so,while ν as M\|Cp (B) appear around 410?cm -1 and 360?cm -1 for Ti and Zr respectively.The influence of the center metal atoms and the substituents upon the NMR and FT\|IR spectra were discussed.
