The first μ3-carbonato-bridged trinuclear zinc(II) complex containing metal atoms in two different coordination enviroments

Aqua(1,4,7,10-tetraazacyclododecane)zinc(II) bis(perchlorate)

“…Atom Zn1 is 0.755 (5) and 0.763 (3) Å above the basal plane formed by four N atoms in conformations A and B, respectively. The Zn1-O1 bond length [1.9721 (4) Å ] is within the typical range [1.94-2.03 Å ] for similar five-coordinated Zn complexes (Bazzicalupi et al, 1995;Chen et al, 1994;Kato & Ito, 1985;Koike et al, 1994;Murthy & Karlin, 1993;Schrodt et al;1997). In addition, the mean Zn1-N bond length (2.13 Å ) in the title complex is similar to that in the crystal structure of [Zn(cyclen)EtOH](ClO 4 ) 2 (Schrodt et al, 1997).…”

Fixation of CO2 by Zinc(II) Chelates in Alcoholic Medium. X-ray Structures of {[Zn(cyclen)]3(μ3-CO3)}(ClO4)4 and [Zn(cyclen)EtOH](ClO4)2

“…The type of carbonate complex strongly depends on the ligand. Monoalkyl carbonate complexes are formed for [14]aneN 4 , [15]aneN 4 , Me 2 [14]aneN 4 , and Me 4 [14]aneN 4 24, whereas ligands such as [12]aneN 4 and [15]aneN 3 O 2 result − in trimeric complexes of the type [LZn] 3 (μ 3 -CO 3 ) containing a triply bridging μ 3 -CO 3 unit (see Tables and ). The reaction scheme in eq 4 is based on information obtained from the literature and our own observations.…”

A new carbonate bridged tetranuclear zinc(ii) complex of an asymmetric tetrapodal compartmental ligand

“…carbonato group and it is the associated connectivity which is unusual. Two oxygen atoms from the carbonate anion bridge a dinuclear centre assembled by ligand coordination whereas in previous examples of µ 3 -bridging each Zn atom was independent of the others in the molecule [6][7][8][9][10][11]. The complex cation may be regarded as arising from the self assembly of two dinuclear components (Fig.4).Thefirst component [Zn(1)Zn(2)L] is donor set asymmetric.…”