Carbonato-bridged complexes

Ht2N(N202)] (500), stabilized with respect to NO release in aqueous solution, was also documented. During this endeavor, complex [(i-Pr3TACN)Cu(02CMe)] (bidentate acetate coordination) (501) and a carbonato-bridged complex (502) were characterized.413... 

Dimeric carbonato-bridged complexes A4[Cr2(C03)4(H20)2] (A = NH4, Li, Na, K, Rb, Cs A2 = Mg) can be precipitated166 from aqueous suspensions of the acetate, and the ammonium salt (or CrC03)157 suspended in ether will react with the stronger acids CF3C02H164 and CF2HC02H167 to give dinuclear carboxylates (equation 17). 

The three carbonato bridged polynuclear complexes of Cu(II) and Zn(II) with 1,10-phenanthroline and bipyridyl as the primary ligands... 

The zinc complex of a 14-membered CA-N2S2 dibenzo macrocycle with two pendent pyridyl-methyl groups was studied (L = 8,ll-bis(2-pyridylmethyl)5,6,7,8,9,10,16,17-octahydro-diben-zo[e,m][l,4]dithia[8,ll]diazacyclotetradecine). In solution, [ZnL]2+ takes up atmospheric carbon dioxide and transforms to the dinuclear complex [(//-C03)(ZnL)2](C104)2. The structures of both complexes have been elucidated. The zinc atoms, which are situated outside the macrocyclic ring, are unsymmetrically bridged by the //-carbonato group.739... 

An analogous nitrato complex, Be40(N03)6, is known in the solid state (145). The presence of a central 4-coordinate oxide ion and bridging nitrato ions has been confirmed by X-ray methods (146). The structures of these solid-state (jl4-oxo complexes lend support to the fi.roxo structures suggested for phosphato and carbonato complexes in solution (see Section IV). 

The p3-bridged carbonato complex posseses a pseudo-3-fold molecular symmetry. Each of the Cu atoms is five coordinate with the four nitrogen atoms of tren and one oxygen atom of the carbonate ligand (C). The coordination polyhedron of the Cu atom can be described as almost (TBP), the copper ions being slightly out of the plane (0.15 A) of the three primary amine groups (Fig. 5). 

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