Περίληψη:
A project related to the crystal engineering of hydrogen bonded
coordination complexes has been initiated and our first results are
presented here. The cis and trans forms of monothiomalonamide (LH2) have
been fully characterized by vibrational spectroscopy, thermal techniques
and single-crystal X-ray diffraction. The cis form crystallizes in the
monoclinic space group P2(1)/c and the trans form in the monoclinic
space group C2/c. The respective lattice constants are a = 5.602(3), b =
9.055(2), c = 10.945(5) Angstrom, beta = 101.29(2)degrees (cis-LH2) and
a = 20.336(7), b = 4.317(1), c = 12.432(5) Angstrom, beta =
92.16(1)degrees (trans-LH2). The new complexes [Pd(LH2)(4)]X-2 (X =
Cl, Br), [Pt(LH2)(4)]X-2 (X = Br, 1), [PdX2(LH2)(2)] (X = Cl, Br, 1)
and [PtX2(LH2)(2)] (X = Cl, I) were prepared and characterized by
elemental analyses and spectroscopic (IR, far-IR, Raman) studies. All
data are discussed in terms of the nature of bonding in conjunction with
assigned structures. The LH2 molecule behaves as a monodentate ligand
binding through the sulfur atom. Monomeric square planar structures are
assigned for the metal complexes in the solid state; the 1:2 complexes
have the trans geometry. A detailed comparison of the new complexes with
the corresponding monothiooxamide complexes is also presented.
Συγγραφείς:
De Beukeleer, S
Papaefstathiou, GS
Raptopoulou, CP
Terzis, A
and Perlepes, SP
Desseyn, HO
Manessi-Zoupa, E
