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Mixed‐Ligand Complexes of Zinc(II) with α‐Hydroxycarboxylates and Aromatic N‐N Donor Ligands: Synthesis, Crystal Structures and Effect of Weak Interactions on their Crystal Packing
Author(s) -
Carballo Rosa,
Covelo Berta,
VázquezLópez Ezequiel M.,
GarcíaMartínez Emilia,
Castiñeiras Alfonso,
Niclós Juan
Publication year - 2005
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.200400444
Subject(s) - chemistry , denticity , thermogravimetric analysis , zinc , ligand (biochemistry) , crystallography , hydrogen bond , supramolecular chemistry , infrared spectroscopy , carboxylate , chelation , octahedron , crystal structure , inorganic chemistry , stereochemistry , medicinal chemistry , molecule , organic chemistry , biochemistry , receptor
Several new two‐ligand complexes of zinc(II) with the aromatic N, N‐donor ligands 2, 2′‐bipyridine or 1, 10‐phenanthroline and one of three different α‐hydroxycarboxylates (HL′) derived of the α‐hydroxycarboxylic acids (H 2 L′) (2‐methyllactic, H 2 mL; mandelic, H 2 M or benzilic, H 2 B) were prepared. The compounds of formula [Zn(HL′) 2 (NN)]·nH 2 O (HL′ = HM, HB) were isolated as white powders and characterized by elemental analysis, IR spectroscopy and thermogravimetric analysis. The complexes of general formula [Zn(HL′)(NN) 2 ](HL′)·nH 2 O (HL′ = HmL, HM) and [Zn(HB) 2 (NN) 2 ], were obtained as single crystals and were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis and X‐ray diffractometry. In all cases, the zinc atom is in a distorted octahedral environment. In [Zn(HL′)(NN) 2 ](HL′)·nH 2 O the α‐hydroxycarboxylato ligands behave as bidentate chelating monoanion and an α‐hydroxycarboxylate as counterion is also present. In [Zn(HB) 2 (NN) 2 ], the monoanionic benzilato ligand behaves as monodentate through one oxygen atom of the carboxylate function. The effect of the classical and no‐classical hydrogen bonding and of the π‐π and C‐H…π interactions in the 3D supramolecular arrangement of these molecular complexes is analyzed.