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A Study of Magnetic Frustration in C...

Mukda, Benjamin Aaron.

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A Study of Magnetic Frustration in Copper (II) Adamantoids and Magnetic Tunability in Cobalt (II) Salts.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A Study of Magnetic Frustration in Copper (II) Adamantoids and Magnetic Tunability in Cobalt (II) Salts./
作者:	Mukda, Benjamin Aaron.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2024,
面頁冊數:	160 p.
附註:	Source: Masters Abstracts International, Volume: 85-11.
Contained By:	Masters Abstracts International85-11.
標題:	Chemistry. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31242252
ISBN:	9798382332178

A Study of Magnetic Frustration in Copper (II) Adamantoids and Magnetic Tunability in Cobalt (II) Salts.
Mukda, Benjamin Aaron.

A Study of Magnetic Frustration in Copper (II) Adamantoids and Magnetic Tunability in Cobalt (II) Salts. - Ann Arbor : ProQuest Dissertations & Theses, 2024 - 160 p.

Source: Masters Abstracts International, Volume: 85-11.

Thesis (M.S.)--Clark University, 2024.

Investigation of magnetism at the molecular level has yielded many compounds and materials of interest. However, research is still being done on many such compounds to understand how the molecular structure of these compounds affects their magnetic behavior and properties. In this thesis, we present investigations on the magnetic properties of one family of compounds that may display magnetic frustration, and another where intrinsic randomness of the materials may be synthetically controlled.The compounds in these families were synthesized using slow evaporation or reflux techniques. Characterization was performed using IR spectroscopy, elemental analysis, and powder X-ray diffraction (PXRD). Single-crystal X-ray diffraction was used to investigate the structure of these compounds and possible magnetic exchange pathways. Magnetic measurements were performed using a SQUID magnetometer.The first family consists of three new copper(II) complexes with the general formula Cu4X6O(L)4 (1, X = chloride, L = 2-amino-5-chloropyridine) (2, X = chloride, L = 2-amino-5- bromopyridine) (3, X = bromide, L = 2-aminopyridine) with an adamantane-like core structure. 1-2 crystallize in the space group P-1, while 3 crystallizes in the space group P21/c. We also report comparisons between the structures of these compounds and ones found in a literature review of compounds with similar structures and organic ligands. The members of this family all exhibit antiferromagnetic interactions and the possibility of magnetic frustration due to their geometries. The second family consists of five synthetically tunable Co(II) salts with the general formula (2-amino-5-iodopyridinium)2[Co(II)Cl4-xBrx]: (4, (2-amino-5-iodopyridinium)2[CoCl4] 5, (2- amino-5-iodopyridinium)2[CoCl4-xBrx] (x= 0.542 ) 6, (2-amino-5-iodopyridinium)2[CoCl4- xBrx] (x= 2.34 ) 7, (2-amino-5-iodopyridinium)2[CoCl4-xBrx] (x= 3.47 ) 8, (2-amino-5- iodopyridinium)2[CoBr4]). All compounds crystallize in the space group P21/c. Controlling the amount of each halide ion introduced into the reaction mixture can control the relative amounts of chloride ion and bromide ion in the products; variable temperature magnetic susceptibility data indicate the presence of single-ion anisotropy in all compounds. Increasing amounts of bromide ion in the samples lead to measurable antiferromagnetic interactions as well. Additionally, we find that changing the relative amounts of chloride ion and bromide ion changes the anisotropy of the compound.

ISBN: 9798382332178Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

Cobalt

A Study of Magnetic Frustration in Copper (II) Adamantoids and Magnetic Tunability in Cobalt (II) Salts.
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500 $a Source: Masters Abstracts International, Volume: 85-11.
500 $a Advisor: Turnbull, Mark M.
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520 $a Investigation of magnetism at the molecular level has yielded many compounds and materials of interest. However, research is still being done on many such compounds to understand how the molecular structure of these compounds affects their magnetic behavior and properties. In this thesis, we present investigations on the magnetic properties of one family of compounds that may display magnetic frustration, and another where intrinsic randomness of the materials may be synthetically controlled.The compounds in these families were synthesized using slow evaporation or reflux techniques. Characterization was performed using IR spectroscopy, elemental analysis, and powder X-ray diffraction (PXRD). Single-crystal X-ray diffraction was used to investigate the structure of these compounds and possible magnetic exchange pathways. Magnetic measurements were performed using a SQUID magnetometer.The first family consists of three new copper(II) complexes with the general formula Cu4X6O(L)4 (1, X = chloride, L = 2-amino-5-chloropyridine) (2, X = chloride, L = 2-amino-5- bromopyridine) (3, X = bromide, L = 2-aminopyridine) with an adamantane-like core structure. 1-2 crystallize in the space group P-1, while 3 crystallizes in the space group P21/c. We also report comparisons between the structures of these compounds and ones found in a literature review of compounds with similar structures and organic ligands. The members of this family all exhibit antiferromagnetic interactions and the possibility of magnetic frustration due to their geometries. The second family consists of five synthetically tunable Co(II) salts with the general formula (2-amino-5-iodopyridinium)2[Co(II)Cl4-xBrx]: (4, (2-amino-5-iodopyridinium)2[CoCl4] 5, (2- amino-5-iodopyridinium)2[CoCl4-xBrx] (x= 0.542 ) 6, (2-amino-5-iodopyridinium)2[CoCl4- xBrx] (x= 2.34 ) 7, (2-amino-5-iodopyridinium)2[CoCl4-xBrx] (x= 3.47 ) 8, (2-amino-5- iodopyridinium)2[CoBr4]). All compounds crystallize in the space group P21/c. Controlling the amount of each halide ion introduced into the reaction mixture can control the relative amounts of chloride ion and bromide ion in the products; variable temperature magnetic susceptibility data indicate the presence of single-ion anisotropy in all compounds. Increasing amounts of bromide ion in the samples lead to measurable antiferromagnetic interactions as well. Additionally, we find that changing the relative amounts of chloride ion and bromide ion changes the anisotropy of the compound.
590 $a School code: 0048.
650 4 $a Chemistry. $3 516420
650 4 $a Inorganic chemistry. $3 3173556
650 4 $a Materials science. $3 543314
650 4 $a Electromagnetics. $3 3173223
650 4 $a Molecular chemistry. $3 1071612
653 $a Cobalt
653 $a Copper
653 $a Magnetism
653 $a Magnetostructural correlations
653 $a X-ray crystallography
653 $a Iodopyridinium
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690 $a 0488
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793 $a English
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