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 Research assistant  position

The Institute of Mineralogy and Crystallography "Acad. Ivan Kostov" at the Bulgarian Academy of Sciences - Sofia, announces a competition for the appointment of an Research assistant professor, professional field 4.4. Earth Sciences (Synthetic and Natural Porous Materials) for the purposes of the department of Structural Crystallography and Materials Science. The deadline for submission of documents is 2 months from the date of publication in the State Gazette. For inquiries and filing of documents - in the office of the Institute at address 1113, Acad. G. Bonchev Str., Bl. 107, room 55, tel. 02 979 70 55.

Associate  Professor position

 The Institute of Mineralogy and Crystallography "Acad. Ivan Kostov "at the Bulgarian Academy of Sciences - Sofia, announces a competition for an  associate professor, professional field 4.4. Earth Sciences (Mineralogy and Crystallography) for the field of Experimental Mineralogy and Crystallography. The deadline for submission of documents is 2 months from the date of the publication in the State Gazette. For inquiries and filing of documents - in the office of the Institute at address 1113, Acad. G. Bonchev Str., Bl. 107, room 55, tel. 02 979 70 55.

Associate Professor position  

The Institute of Mineralogy and Crystallography "Acad. Ivan Kostov "at the Bulgarian Academy of Sciences - Sofia, announces a competition for an associate professor, professional field 4.4. Earth Sciences (Spectroscopy and Isotopic Mass Spectrometry of Minerals and Synthetic Solid state Objects) for the purposes of the department of structural crystallography and material science. The deadline for submission of documents is 2 months from the date of publication in the State Gazette. For inquiries and filing of documents - in the office of the Institute at address 1113, Acad. G. Bonchev Str., Bl. 107, room 55, tel. 02 979 70 55.

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Synthesis and structure of crystallohydrates
and ureates of magnesium salts

 

by

Krasimir Stefanov Kossev

 

A dissertation submitted in partial fulfillment of the requirements

for the degree of Doctor of Philosophy

in the Department of "Structural Crystallography and Materials Science"
at the Institute of Mineralogy and Crystallography “Acad. Iv. Kostov” – BAS, Sofia, Bulgaria

 

Supervisors: Prof. Rosica Nikolova

Prof.  Boris Shivachev

 

Summary

 

In the present thesis, the methods for the preparation of magnesium chlorate, its hydrates and ureates have been reviewed. A laboratory method to produce magnesium chlorate hexaureate free of concomitant inorganic salts has been developed. The relatively simple procedure, without the need for specialized equipment, makes it possible to assume that the method is scalable enough and without any effort it could be used in а large-scale production.

The crystalline structures of two of the hydrates of magnesium chlorate - magnesium chlorate dehydrate, Mg(ClO3)2.2H2O, and magnesium chlorate hexahydrate, Mg(ClO3)2.6H2O, have been determined.

The crystalline structures of three urea complexes of magnesium salts, i.e. magnesium chlorate hexaureate, Mg(ClO3)2.6OC(NH2)2, magnesium sulfate tetraurea monohydrate, MgSO4.4OC(NH2)2.H2O, and magnesium sulfate hexaurea hemihydrate, MgSO4.6OC(NH2)2.1/2H2O, have been elucidated.

In the investigated magnesium ureates and hydrates the coordination number of the magnesium atom is six, and no significant deformation of the coordinating octahedron has been observed.

The studied compounds form a large number of hydrogen bonds that determine the supramolecular structure and stabilize it.

 

Sofia 2017