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Ionic compounds formed from iron and urea
| Details |
Inventors: Atkisson, A. David;
Assignee: Eagle-Picher Industries, Inc. (Cincinnati, OH)
Primary Examiner: Bashore; S. Leon
Assistant Examiner: Lander; Ferris H.
Attorney, Agent or Firm: Wood, Herron & Evans
Novel ionic compounds of the class [Fe{CO(NH.sub.2).sub.2 }.sub.n (H.sub.2 O).sub.6-n ].sup.++ SO.sub.4.sup.-- wherein n is 2, 3, 4 or 5, are produced by solid state reaction between a ferrous sulfate hydrate and urea under extended intensive physical impingement conditions, as for example by ball milling for a period in excess of 2 hours, until particles of an unusual characteristic shape are formed. Uses of the compounds include correcting iron deficiencies in plants. |
|
DETAILED DESCRIPTION Having described the invention, what is claimed is: 1.
As a new compound for correcting iron deficiency in plants aquocarbamide iron II sulfate, corresponding to the formula [Fe{CO(NH.
sub.
2).
sub.
2 }.
sub.
n (H.
sub.
2 O).
sub.
6-n ].
sup.
++ SO.
sub.
4.
sup.
-- where n is 2, 3, 4 or 5, said compound comprising dumbbell shaped crystalline particles.
2.
The compound of claim 1, in the presence of displaced water of hydration.
3.
The dry compound of claim 1.
4.
The compound of any of claim 1, 2 or 3 wherein n is 2.
5.
The compound of any of claim 1, 2 or 3 wherein n is 3.
6.
The compound of any of claim 1, 2 or 3 wherein n is 4.
7.
The compound of any of claim 1, 2 or 3 wherein n is 5.
8.
The method of converting an iron II sulfate hydrate into a plant nutrient compound having the empirical formula [Fe{CO(NH.
sub.
2).
sub.
2 }.
sub.
n (H.
sub.
2 O).
sub.
6-n ].
sup.
++ SO.
sub.
4.
sup.
-- wherein n is 2, 3, 4 or 5, said method including the steps of mixing particles of urea in an iron II sulfate hydrate in a mole ratio of substantially n:1, impinging particles of the constituents of the mixture on one another to cause solid state reaction thereof and continuing said impinging for a period of at least about 2 hours until dumbbell-shaped crystals of said plant nutrient compound are formed, said crystals being suspended in water displaced from said hydrate during said impinging.
9.
The method of claim 8 wherein the impinging is continued until equilibrium is achieved, as demonstrated by absence of further change in x-ray diffraction pattern and infrared spectrum.
10.
The method of claim 8 wherein n is 2.
11.
The method of claim 8 wherein n is 3.
12.
The method of claim 8 wherein n is 4.
13.
The method of claim 8 wherein n is 5.
14.
The method of claim 8 wherein the constituents are contacted by milling.
15.
The method of claim 8 wherein said constituents are contacted by ball milling for a period in excess of about two hours.
16.
The method of claim 8 wherein said urea and hydrate are in crystalline form at the start of said reaction, and the constituents are gradually wetted by water displaced from said hydrate
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Molecular Biology 
