Synthesis and characterization of cobalt(II), nickel(II) and zinc(II) complexes of a 14-membered cis-N2S2 dibenzo macrocycle with two pendant pyridylmethyl groups

Synthesis and coordination chemistry of 1,1,1-tris-(pyrid-2-yl)ethane

“…This  1 : 2 ,-CO 3 2− coordination mode has been observed in several complexes of copper(II) 33,35,36 and other transition ions. 37 Both copper ions have near-ideal square-pyramidal geometries according to their  parameters [0.172(4)/0.217 (6) for Cu(1), calculated from I(1) and O(1) respectively, and 0.019(4) for Cu (2)]. 38 The [CuI 3 ] 2− counterion in 7b has crystallographically imposed C 2 symmetry, and shows only small deviations from a triangular geometry.…”

Insights into the absorption of carbon dioxide by zinc substrates: isolation and reactivity of di- and tetranuclear zinc complexes

“…In the [Zn 2 L] + moiety, the ligand displays a heptadentate behaviour, similar to that observed in 1, so providing two N 2 O compartments and with the central phenol oxygen atom O(203) bridging both metal centres. With respect to the [Zn 2 L(H 2 O)] + unit, in this case the ligand is acting as hexadentate, with a typical N 2 O compartment around Zn (11), whereas the other outer arm is only coordinated to Zn (12) through an NO donor set, as its N amine atom remains uncoordinated [Zn(11) In addition, a water molecule is also bonded to Zn (12).…”

“…The coordination spheres of both dinuclear cationic moieties are completed by an exogenous carbonate ligand, with a  4 - 1 : 22) angle is similar to those reported for other  2 -phenoxo dinuclear zinc complexes. 20,22,34 The metal centres of the Zn (12) shows a distorted tetrahedral NO 3 coordination, whereas Zn (11), Zn (21) and Zn(22) are N 2 O 3 penta-coordinated. Their  parameters 33 [0.60 for Zn (11), 0.38 for Zn(21) and 0.17 for Zn (22)] are indicative of a distorted trigonal bipyramidal geometry for Zn (11), where O(101) and N(103) constitute the axial vertexes and the  2 -O carbonate is in the basal plane.…”

“…Several di- [9][10][11][12][13][14] and trinuclear [15][16][17][18][19] carbonate zinc complexes have been isolated by means of carbon dioxide fixation, but only a few reports refer to tetranuclear compounds. In fact, and to the best of our knowledge, there are only four tetranuclear carbonate zinc complexes previously described in the literature.…”

The donor ability of the chelated carbonate ligand: protonation and metallation of [(L)Co(O2CO)]+ complexes in aqueous solution

“…To our knowledge, there are no examples of direct metallation of the exo O atom of a substitutionally inert metal carbonate complex, the result of which would be a complex containing metal ions bridged in an g 2 :g 1 fashion by carbonate. While there are some crystallographically characterised complexes containing this structural motif, they have all been either obtained from self-assembly type reactions with labile metal ions [29][30][31][32][33][34][35][36][37][38][39] or resulted from rearrangement of carbon monoxide, 40 carbon dioxide [41][42][43] or carbamate 44…”