Glycinate Complexes of Zinc and Cadmium

Abstract

Homo-17a-oxa-l,4-androstandiene-3,17-dione, 2.00 g., was dissolved in 60 ml. of pyridine and hydrogen sulfide was bubbled into the solution for two hours. Then 2 drops of piperidine was added and the reaction was allowed to stand for 3 days. After this time 200 ml. of water was added and the solution was extracted three times with ether. A solid formed in the aqueous layer and was separated by filtration.It was crystallized from ethyl acetate to give 0.34 g. of la,-5a-epidithio-17a-oxa-D-homoandrostane-3,17-dione, m.p. 232-233°dec., red melt, [«]d -140 ± 2°,

Structures of three glycine-bridged polymeric complexes: [Mn(glycine)(H2O)2Cl2], [Co(glycine)(H2O)2Cl2] and [Co(glycine)(H2O)4](NO3)2

“…In complexes with metal ions, glycine and other amino acids may coordinate as their anions or as zwitterionic acids, depending on conditions. In the former case the amino group may take direct part in the coordination (Low, Hirshfeld & Richards, 1959;Stosick, 1945;Dejehet & Debuyst, 1978); in the zwitterion form, the protonated amine N atom is prevented from doing so, and coordination is via the carboxylate oxygen atoms alone, to give either monodentate or bidentate bonding (Dejehet, Debuyst, Ledieu, Declercq, Germain & Van Meerssche, 1978;Glowiak & Kozlowski, 1980;Ardon, Bino, Cohen & Felthouse, 1984, and references therein). In some cases, mixtures of the two types of complex are formed (Herzog & Kalies, 1967).…”

Structure du L-α-alaninate de cadmium trihydraté

“…La configuration autour de l'atome de cadmium est cis-O (7) . Une telle coordination octa6drique est pr6sente dans le glycinate de cadmium (Low et al, 1959) mais, dans ce cas, la configuration est trans et l'octa6dre plus d6form~, la complexation ~tant assur6e par deux mol6cules de glycine jouant le r61e de chelate et compl&6e par deux atomes d'oxyg~ne de deux autres mol6cules de ligand. Par contre, la g~om6trie obtenue pour l'alaninate de cadmium est tr6s proche de celle observ~ dans le di-a-aminoisobutyrate de nickel t6trahydrat6 (Noguchi, 1962).…”

A New Synthetic Method of Zinc(II) Complexes Based on Mixing

“…Other Zn(II) complexes (4-11) [4][5][6][7][8][9][10][11][12][13][14][15][16][17] were prepared by mixing diŠerent solid ligands with Zn(OH) 2 or ZnO at a 2：1 or 1：1 molar ratio with or without the addition of a minimum amount of water at room temperature (maximum yield 98％, minimum 90％) ( Table 1).…”

“…bis (Maltolato) Zn(II) Complex (6) 5,7,8) , bis (glycinato)Zn(II) Complex (8) [10][11][12][13] , bis (L-aalaninato) Zn(II) Complex (9) 13,14) , bis (L-balaninato) Zn(II) Complex (10) 15) , and bis (Lphenylalaninato ) Zn ( II ) Complex ( 11 ) 16,17) These Zn(II) complexes were prepared in a manner similar to method a), b), or c) of 4 using the corresponding ligands (2.5 mmol) and Zn(OH) 2 or ZnO (1.25 mmol) as a white crystalline powder (the Zn (II) complexes recrystallized by water; colorless crystals) (see Table 1). …”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] However, that method has the disadvantages of increased costs of Zn(II) complexes due to the alkali and large quantity of organic solvents required, along with the undesirable eŠects on the environment and human health alkali used. This paper reports a new method to obtain Zn(II) complexes at high yields (more than 90％) by direct mixing of solid ligands and solid Zn(OH) 2 or ZnO with or without the addition of a minimum amount of water without the use of alkali and organic solvents.…”