Group 12 element

Abstract: Victor Grignard's Nobel Prize-winning preparation of organomagnesium halides (Grignard reagents) marked the formal beginning of organometallic chemistry with alkaline earth metals. Further development of this invaluable synthetic route, RX+Mg→RMgX, with the heavier alkaline earth metals (Ca and Sr) was hampered by limitations in synthetic methodologies. Moreover, the lack of suitable ligands for stabilizing the reactive target molecules, particularly with the more electropositive Ca and Sr, was another obstacle. The absence in the literature, until just recently, of fundamental alkaline earth metal complexes with M-H, M-F, and M-OH (where M is the Group 2 metal Mg, Ca, or Sr) bonds amenable for organometallic reactions is remarkable. The progress in isolating various unstable compounds of p-block elements with β-diketiminate ligands was recently applied to Group 2 chemistry. The monoanionic β-diketiminate ligands are versatile tools for addressing synthetic challenges, as amply demonstrated with alkaline earth complexes: the synthesis and structural characterization of soluble β-diketiminatocalcium hydroxide, β-diketiminatostrontium hydroxide, and β-diketiminatocalcium fluoride are just a few examples of our contribution to this area of research. To advance the chemistry beyond synthesis, we have investigated the reactivity and potential for applications of these species, for example, through the demonstration of dip coating surfaces with CaCO(3) and CaF(2) with solutions of the calcium hydroxide and calcium fluoride complexes, respectively. In this Account, we summarize some recent developments in alkaline earth metal complex chemistry, particularly of Mg, Ca, and Sr, through the utilization of β-diketiminate ligands. We focus on results generated in our laboratory but give due mention to work from other groups as well. We also highlight the closely related chemistry of the Group 12 element Zn, as well as the important chemistry developed by other groups using the complexes we have reported. Although Mg and Ca are more abundant in living organisms, no other metal has as many biological functions as Zn. Thus Zn, the nontoxic alternative to the heavier Group 12 elements Cd and Hg, occupies a unique position ripe for further exploration.

Abstract: The present invention relates to a non-aqueous electrolyte secondary battery The negative electrode of the present invention is characterized by its composite particles constructed in such a manner that at least part of the surrounding surface of nuclear particles containing at least one of tin, silicon and zinc as a constituent element, is coated with a solid solution or an intermetallic compound, which are composed of the element contained in the nuclear particles, and at least one other element except the elements contained in the nuclear particles selected from a group comprising group 2 elements, transition elements, group 12 elements, group 13 elements and group 14 elements except carbon of the Periodic Table The electrolyte uses anion lithium salts of organic acid dissolved in organic solvent with high oxidation resistant characteristics By adopting the above construction, a battery which generates only a small amount of gas during a high temperature storing can be obtained Furthermore, the batteries enjoy high energy density and a lower reduction rate of discharge capacity when used repeatedly as well as high charge/discharge properties

Abstract: Molecular compounds featuring direct metal–metal bonds have stirred up interest for many decades now, with the nature of the bonding between the two metal centers generally being the focus of attention. In recent years interest has centered on several cluster compounds of Group 13 and 14 elements with unusual bonding properties (multiple bonds or delocalized “metal-like” bonds). In the case of Group 12 elements (Zn, Cd, Hg), compounds with direct metal–metal bonds are well known for mercury, reflecting the preference of this element for a formal oxidation state of + 1. As to cadmium, the compounds Cd2(AlCl4)2 [3] or Cd2(Tp )2 [4] (Tp2= hydrotri(3,5-dimethylpyrazolyl)borate) have direct Cd Cd bonds. However, owing to the increased instability of the formal oxidation state + 1, the [Cd2] 2+ ion disproportionates immediately in the presence of water to give Cd and Cd. Thus, the ability of Group 12 elements to be engaged in direct metal– metal bonding decreases dramatically from mercury to cadmium to zinc reflecting the decreasing stability of the formal oxidation state + 1. On these grounds it was for some time questionable whether it would be possible to synthesize molecular compounds featuring a direct Zn Zn bond. With [Cp*ZnZnCp*] (1; Cp*= C5Me5), Carmona and co-workers have now synthesized the first representative of this class of compounds. As often in the case of great advances in chemistry chance played a significant role. The compound was formed unexpectedly as the product of the reaction between decamethylzincocene and diethyl zinc. At room temperature a mixture between the expected zinc(ii) compound [Cp*ZnEt] (2) and the unexpected zinc(i) compound 1 was obtained. Depending on the reaction conditions the reaction can be manipulated to lead to either 1 or 2 as a characterizable product (Scheme 1). A new route (box in Scheme 1) now allows 1 to be prepared in a few grams, opening up the possibility to study the chemistry of this fascinating compound. Compound 1 turns out to be a colorless, pyrophoric solid. The molecular structure (Figure 1) shows a central Zn2

Abstract: An acetic acid production catalyst that contains (b) at least one element selected from the group consisting of Group 14 elements, Group 15 elements and Group 16 elements of the Periodic Table and/or (c) at least one element selected from the group consisting of Group 6 elements, Group 7 elements, Group 8 elements, Group 9 elements, Group 10 elements, Group 11 elements and Group 12 elements of the Periodic Table, added to a palladium-loaded catalyst, as well as an acetic acid and ethyl acetate production catalyst that contains (b) at least one compound selected from the group consisting of inorganic acids and salts thereof and/or (c) at least one element selected from the group consisting of Group 14 elements, Group 15 elements and Group 16 elements of the Periodic Table and/or (d) at least one element selected from the group consisting of Group 6 elements, Group 7 elements, Group 8 elements, Group 9 elements, Group 10 elements, Group 11 elements and Group 12 elements of the Periodic Table, added to palladium.