Structural transformations in complexes of cobalt, nickel and copper with selected α-amino acids and their derivatives

Istražene su reakcije kobaltovih(II), niklovih(II) te bakrovih(II) soli s glicinamidom (HGlyam), D-allo- i L-izoleucinom te L-homoserinom s ciljem priređivanja bis(didentatnih) koordinacijskih spojeva. Priređeno je i strukturno karakterizirano 17 bis(didentatnih) i jedan tris(didentatni) koordinacijski spoj te je proučena cis-trans izomerizacija u otopini i u čvrstom stanju. Utvrđena je značajna uloga metalnog iona u kristalizaciji određenog izomera, a također ključan čimbenik može biti anion, otapalo, atmosfera, temperatura i pH-vrijednost otopine. Dodatno je proučen temperaturno ovisan reverzibilan polimorfni prijelaz u spoju cis-[Ni(H2O)2(HGlyam)2]I2 čiji kristali pokazuju zanimljivo svojstvo samocijeljenja. U reakcijama s 2,2'-iminodiacetamidom priređeno je i strukturno karakterizirano 7 bis(tridentatnih) spojeva kobalta(II) i nikla(II). Priređena su i strukturno karakterizirana 22 ternarna koordinacijska spoja bakra(II) s α-aminokiselinama (glicin, L-serin i L-homoserin) i heterocikličkim bazama (2,2’-bipiridin i 1,10-fenantrolin). U nekoliko slučajeva uspješno je određen mehanizam međupretvorbe različitih solvata u čvrstom stanju, što je prvo takvo istraživanje na ovoj skupini spojeva. Reactions of cobalt(II), nickel(II), and copper(II) salts with glycinamide (HGlyam), D-allo- and L-isoleucine, and L-homoserine were investigated and 17 bis(bidentate) and one tris(bidentate) coordination compounds were prepared and structurally characterized. Cis-trans isomerization of bis(bidentate) compounds in solution and solid-state was studied. The role of a metal ion in the crystallization of a certain isomer was determined, however, in some cases the key factor was anion, solvent, atmosphere, temperature, or pH of the solution. In addition, temperature dependent reversible polymorphic transition, with self-healing property of cis-[Ni(H2O)2(HGlyam)2]I2 crystals was studied. In reactions involving 2,2'-iminodiacetamide 7 new bis(tridentate) coordination compounds with cobalt(II) and nickel(II) were prepared and structurally characterized. Moreover, 22 ternary coordination compounds of copper(II) with α-amino acids (glycine, L-serine, L-homoserine) and heterocyclic bases (2,2'-bipyridine and 1,10-phenanthroline) were synthesized and structurally characterized. For some compounds, the mechanism of interconversion of different solvatomorphs in the solid-state was successfully determined, which is the first such study on this group of compounds.