Group IIA

2 Compounds containing Bonds between Transition Metals and the Elements of Groups IIA and IIIB—VB 

A study of the chemical and structural relationships among [ MFe(CO)4 n] (M = Zn, Cd, Hg, or Pb) and [ AgCo(CO)4 ], and their Lewis base adducts has been described. The degree of association of the adducts depends on the number of ligands attached to M for example, [(py3Zn)Fe(CO)4] is monomeric whereas [ (bipy)Zn Fe(CO)4] is oligomeric.  

Group IIA.— The inorgano-Grignard reagents [ (THF)2BrMg MoHCp2) and [ (THF)aBrMg)Fe(dppe)Cp] are weak bases and nucleophiles. The reactions of the latter, but not of the former, with alkylbromides appear to involve one-electron transfer. 

---

Group IIB and know that this means the group of elements zine. cadmium and mercury, whilst Group IIA refers to the alkaline earth metals beryllium, magnesium, calcium, barium and strontium. 

Group IIA metals inelude Be, Mg, Ca, Sr, Ba and Ra whieh are grey, moderately-hard, high melting-point substanees. Like the alkali metals they attaek water to liberate hydrogen but with less vigour. The salts of the alkaline earths are generally less stable towards heat and water than those of alkali metals, and less water soluble. 

In Europe, rather than Groups A through D, gases and vapors are classified in Groups IIA through IIC. A comparison of the U.S. and European groupings is as follows ... 

The effects of pre-irradiation [908], although still marked, were less for a given dose than those observed for the alkali metal permanganates. The other Group IIA permanganates are obtained as hydrates. 

The decomposition of dolomite shows many points of similarity with the reactions of calcite and of other single carbonates of Group IIA metals (Sects. 3.1.1 and 3.1.2) the reaction is reversible, occurs at an interface, and both apparent kinetic parameters and reactivity are influenced by the prevailing C02 pressure. 

Formation of Group-11IB-Group>IA or Group-IIA Bonds... 

This chapter describes the formation of bonds of the group-IA and group-IIA metals to the group-IA, group-IIA, group-IB and group-IIB metals, as well as to the transition and inner transition metals. 

---