Structural trends in one and two dimensional coordination polymers of cadmium(ii) with halide bridges and pyridine-type ligands

Crystal structure of Co(3-pic)2Cl2 and thermal behaviour of a new complex, Co(py)(3-pic)Cl2

“…The planes in the range of experimental error picoline ring of Co(3-pic) 2 Cl 2 are inclined at 77.13(9)°in molecule A and at 64.26(9)°in molecule B. In similar compounds this angle varies from 0.0°in trans-diiodo-bis(3-picoline)-platinum(II) [29] to 83.52°i n trans-diiodo-bis(3-picoline)cadmium(II) [28]. It is worth mentioning that except Co(3-pic) 2 Cl 2 exists as a six coordinated Co compound: dibromo-tetrakis(3-picoline)cobalt(II) [32].…”

“…The coordination sphere of the central atom can be described as a distorted tetrahedron with the Cl-Co-Cl angle distinctly larger then the tetrahedral one ( Table 1). The methyl groups of 3-picoline substituents are cis for the molecule indicated by the Co (1) [27][28][29][30], but only one compound can be found with the cis conformation of 3-picoline substituents methyl groups:…”

Kristall‐zu‐Kristall‐Umwandlung von einem Kettenpolymer zu einem zweidimensionalen Netz bei tiefen Temperaturen

“…Die Integration erfolgte mit SAINT, [27] die Absorptionskorrektur mit SADABS. [28] Die Strukturen wurden mit Direkten Methoden gelöst (SHELXS-97) [29] und mit SHELXL-97 [30] auf F Wir möchten auf die interessante Raumgruppenproblematik [31,26] bei 2D-Netzwerken der Zusammensetzung [M(m-X) 2 …”

Crystal structure of diiodido-bis(phenanthridine-κN)cadmium(II), CdI2(C13H9N)2, C26H18CdI2N2

“…[7][8][9][10]. In most cases, zinc (II) derivatives form mononuclear tetrahedral complexes, whereas the higher homologue cadmium(II) yields chain polymers [7][8][9][10]. Different from the chain polymers of most reported CdX 2 L 2 , the title compound is a mononuclear tetrahedral complex.…”

“…For group 12 (IIB) metal halides and pyridine-type ligands, the reported hybrid materials generally have a formal composition [MX 2 (L) 2 ], where M represents a divalent metal cation (Zn, Cd, Hg), X a halogen ligand (Cl, Br, I), L a pyridine derivative such as pyridine, pyrazine or bipyridine, etc. [7][8][9][10]. In most cases, zinc (II) derivatives form mononuclear tetrahedral complexes, whereas the higher homologue cadmium(II) yields chain polymers [7][8][9][10].…”