Complexes of group 2 Be, Mg, Ca, Sr, Ba

There are few studies that compare two or more of the group 2 metal enolates. One is an ESR study of the bis(semidione) of l,l,4,4-tetramethyltetralin-2,3-dione (8) where M = Be +, Mg +, Ca +, Sr +, Ba + and Zn +, and the analogous tris-complex of AP in frozen solutions of 2-methyltetrahydrofuran. Be, Ba and Zn form only one kind of complex 8, while there are four types for Mg + and Ca and three types with Sr +. AU group 2 cation complexes are in their triplet state that of A1 is likely a quartet-state complex. Another study discusses the use of the rhodizonate ion (3) as reagent for the detection of Sr +, with stronger enolate-metal binding than with and Ba ... 

Metal ligand complexes can be divided into three groups based upon the stability of the complexes and the identity of the preferred ligands (Buffel, 1989). The group 1 and 2 elements (Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba) tend to complex only with oxygen in... 

Alkaline earth metal derivatives can also be prepared from the tellurol and [Me3Si)2N]2M(THF)2 (M = Ca, Sr, Ba) in hexane and crystallize from THF with 4 ligands (M = Ca, Sr) or 5 (M = Ba). The magnesium compound is prepared from Bu2Mg and the tellurol as a THF complex of tetrahedral structure. The Mg derivative substitutes CP2MCI2 to give the group IV tellurides . ... 

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