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In Search of Binary Hybrid Systems in Manganese Chemistry: The Synthesis, Spectroscopic and Structural Characterization, and Magnetic Properties of a New Species in the Aqueous Mn II ‐Quinic System
Author(s) -
Menelaou Melita,
Raptopoulou Catherine P.,
Terzis Aris,
Tangoulis Vassilis,
Salifoglou Athanasios
Publication year - 2006
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200501093
Subject(s) - chemistry , reactivity (psychology) , electron paramagnetic resonance , manganese , aqueous solution , inorganic chemistry , coordination complex , context (archaeology) , metal ions in aqueous solution , metal , crystallography , ligand (biochemistry) , organic chemistry , nuclear magnetic resonance , medicine , paleontology , physics , alternative medicine , pathology , biology , biochemistry , receptor
Abstract Manganese is a metal with diverse (bio)chemical reactivity in aqueous media in the presence of biologically relevant ligands. Key to that reactivity is the existence of soluble and bioavailable forms of Mn II across the physiological range of pH. To probe the interactions arising between Mn II and the low‐molecular‐mass ligand D ‐(–)‐quinic acid, research efforts were targeted at the synthetic aqueous chemistry in the requisite binary system. The pH‐specific synthetic reaction of Mn II with D ‐(–)‐quinic acid led to the isolation of the new species [Mn 2 (C 7 H 11 O 6 ) 4 ] n · n H 2 O ( 1 ). Complex 1 was characterized by elemental analysis, spectroscopic techniques (EPR, FTIR), thermal and magnetic studies, and X‐ray crystallography. The molecular lattice of 1 reveals the presence of dimeric units of Mn II centers, with the quinate ligands coordinated to the metal ions through variable binding modes, indicating the diversity of chemical reactivity in the system. The octahedral Mn II centers in the molecular assembly of 1 serve as chemical prototypes of the forms of interactions that most likely develop in biologically relevant fluids, similar to those encountered in plant exudates and plant cellular structures. Concurrently, the physicochemical features of 1 (from the 3D hydrogen‐bonding network to the magnetic susceptibility properties and EPR spectral results) exemplify the key features that constitute the rudiments of Mn II ‐organic hybrid lattices of specific functions and (bio)chemical reactivity patterns. The collective properties of 1 are discussed in the context of their occurrence in natural binary Mn II ‐influenced systems and advanced metal‐hybrid materials of potential applications. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)