Compounds of Amino Acids as Anions

摘要: This chapter deals with salts formed from metal cations and amino acid anions. All acids can act as monovalent anion; the acidic members glutamic aspartic well cysteine tyrosine form both divalent Due to large number of available cations, a multitude combinations is possible in fact found (for standard twenty acids, over 150 crystal structures are published, many more species have been characterized by other methods). Different hydration states (as reported for pristine crystals) occur well, existence polymorphs also documented some cases. The formation metal–amino complexes has studied several works (both given cation), flexibility molecules ligands allows coordination different chemical properties (such charge or ionic radius). Several modes – monodentate, bidentate, tridentate, bridging ligands. connectivity polyhedra considered isolated units frequent, but chains layers well. Moreover, these connect via higher-dimensional structures. Hydrogen bonds (also involving water molecules, interstices water) further stabilize units, forming relatively stable phases. frequency varies among most examples glycinate salts, whereas crystals basic weakly soluble difficult obtain (e.g., arginate lysinate not crystalline state). Finally, aspect symmetry (the chirality playing crucial role), and, consequently, impact on applications fields physics, biology, medicine.