The complex salt Δ-α-[Co(R,R-picchxnMe2)(S-phe)](ClO4) 2· H2O, where R,R-picchxnMe2 = N,N′-dimethyl-N,N′-di(2-picolyl)-1R,2R-diaminocyclohexane and S-phe is the monovalent anion of S-phenylalanine, has been prepared and its structure determined by single-crystal X-ray methods. Δ-α-[Co(R,R-picchxn Me2)(S-phe)](ClO4)2 · H2O is orthorhombic, space group P212121 with a= 10.208(1), b=16.804(1), c= 19.194(3)Å, V= 3292.5Å3, Z = 4, Dc = 1.542 and Dm= 1.49Mgm-3. The structure was refined to R = 0.046 for 3554 independent reflections with I > 2σ(I). As is the case with the R-phe analogue, the phenyl ring of the coordinated aminoacidate is not in the extended conformation, but lies adjacent to one of the pyridyl rings of the coordinated tetradentate. The attractive intramolecular π-π interaction which stabilises this conformation is analogous to that which serves to stabilise the stacking of parallel base pairs in DNA.
|Number of pages||8|
|Journal||Journal of Coordination Chemistry|
|Publication status||Published - 1999|
- Van der waals bond
- X-ray structure