Synthesis and properties of new tetrachlorocobaltate (II) and tetrachloromanganate (II) anion salts with dicationic counterions

• Published in: Polyhedron Vol. 30; no. 3; pp. 497 - 507
• Main Authors: Chang, Jui-Cheng, Ho, Wen-Yueh, Sun, I-Wen, Chou, Yu-Kai, Hsieh, Hsin-Hsiu, Wu, Tzi-Yi
• Format: Journal Article
• Language: English
• Published: OXFORD Elsevier Ltd 21.02.2011; Elsevier
• Subjects: Chemistry; Chemistry, Inorganic & Nuclear; Crystallography; Dication; Ionic liquid; Magnetic susceptibility; Physical Sciences; Science & Technology; Tetrachlorocobaltate (II) anion; Tetrachloromanganate (II) anion; Tetrachlorocobaltate (II) anion; Dication; Tetrachloromanganate (II) anion; Ionic liquid; Magnetic susceptibility; TRANSITION; BEHAVIOR; IONIC LIQUIDS
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2010.11.009

New tetrachlorocobaltate (II) and tetrachloromanganate (II) ionic compounds containing various counterdications were synthesized and characterized. These salts are soluble in polar solvents such as methanol and water. Physical properties such as thermal stability, melting point, and magnetic susceptibility of these salts depend on the cation or anion structure. The thermal stability of the phosphinium or imidazolium based salts is higher than that of the pyridinium or triethylaminonium analogues. The melting point of these compounds is following the order of triphenylphosphinium > pyridinium > imidazolium dications, and symmetrical dicationic salts > unsymmetrical ones. The magnetic susceptibility ( χ M T values) of tetrachloromanganate (II) anions-based salts is higher than that of tetrachlorocobaltate (II) anions-based salts. These dicationic salts exhibit weak antiferromagnetic interactions and have higher magnetic susceptibility than that of the previously reported tetrachloromanganate (II) and tetrachlorocobaltate(II) salts with monocationic counterion. [Display omitted] ► The thermal stability of the phosphinium or imidazolium based salts is higher than that of the pyridinium or triethylaminonium analogues. ► The melting point of these compounds is following the order of triphenylphosphinium > pyridinium > imidazolium dications, and symmetrical dicationic salts > unsymmetrical ones. ► These dicationic salts exhibit weak antiferromagnetic interactions and have higher magnetic susceptibility than that of the previously reported tetrachloromanganate (II) and tetrachlorocobaltate (II) salts with monocationic counterion. New tetrachlorocobaltate (II) and tetrachloromanganate (II) ionic compounds containing various counterdications were synthesized and characterized. These salts are soluble in polar solvents such as methanol and water. Physical properties such as thermal stability, melting point, and magnetic susceptibility of these salts depend on the cation or anion structure. The thermal stability of the phosphinium or imidazolium based salts is higher than that of the pyridinium or triethylaminonium analogues. The melting point of these compounds is following the order of triphenylphosphinium > pyridinium > imidazolium dications, and symmetrical dicationic salts > unsymmetrical ones. The magnetic susceptibility ( χ M T values) of tetrachloromanganate (II) anions-based salts is higher than that of tetrachlorocobaltate (II) anions-based salts. These dicationic salts exhibit weak antiferromagnetic interactions and have higher magnetic susceptibility than that of the previously reported tetrachloromanganate (II) and tetrachlorocobaltate(II) salts with monocationic counterion.