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Zinc and cadmium adducts of 2,2′‐Bis(pyrazol‐1‐yl) propane,(LL), a sterically hindering ligand. Crystal structure of (LL)Zn[OC(O)CF 3 ] 2 (H 2 O)
Author(s) -
Bovio Bruna,
Cingolani Augusto,
Pettinari Claudio,
Lobbia Giancario Giola,
Bonati Flavio
Publication year - 1991
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19916020118
Subject(s) - steric effects , chemistry , ligand (biochemistry) , zinc , adduct , denticity , crystal structure , chelation , trigonal bipyramidal molecular geometry , medicinal chemistry , crystallography , stereochemistry , bipyramid , cadmium , inorganic chemistry , organic chemistry , biochemistry , receptor
1:1 adducts between the title ligand and MX 2 (M = Zn or Cd; X = Cl, Br, I or trifluoroacetate) as well as ionic compounds [(LL) 5 Zn 2 (H 2 O) 2 ](ClO 4 ) 4 and [(LL) 2 Cd(H 2 O) 2 ](ClO 4 ) 2 are stable in the solid state and in acetone solution, but not in dimethylsulphoxide. In (LL)Zn(H 2 O)[OC(O)CF 3 ] 2 two oxygen atoms (belonging to water and to one OC(O)CF 3 ) at 2.039(4) and 2.008(4) Å from Zn, and one nitrogen atom (ZnN 2.067(3) Å) from the chelating LL define the basal plane of a trigonal bipyramid, which is distorted owing to the steric requirements of the bridgehead methyls of LL; the axial ZnX bonds (X = N 2.125(3) Å; X = O 2.085(4) Å), are longer than the equatorial ZnX bonds.