Synthesis, optical and magnetic properties of homo- and heteronuclear systems and glasses containing them

To study the effect of ion pairs (f and d-f) coupled in a polymeric system on their optical and magnetic properties, syntheses of homo- and heteronucl ear systems were undertaken. Single crystals of the polynuclear Nd glutarat e of formula [Nd(Glut)(H2O)(4)]Cl . 2H(2)O (1) were obtained. The X-ray dif fraction analysis shows the triclinic system and the P1 space group. The st ructure consists of polynuclear two-dimensional chains built of dimeric uni ts with two nonequivalent Nd3 + centres. The two Nd3 + ions are coordinated by carboxyl groups of the glutarate anion and water molecules. Two differe nt coordination modes of the carboxylate group occur in the structure: simp le bridging (bidentate) and chelating bridging (tridentate). There are five oxygen atoms of four carboxylate groups in the direct environment of each Nd ion and four water molecules complete the coordination number at nine. T he network of hydrogen bonds stabilises the crystal structure. The above st ructural characteristics are well manifested in the spectroscopic propertie s of crystalline 1. Using the sol-ger technique, neodymium (2) and Nd3 + : CU2 + glutarate (3) were incorporated in glass. Glasses of good optical qua lity were obtained, enabling an analysis of the spectroscopic properties of the investigated systems and consideration of the heteronuclear forms in t he glass. The optical and magnetic behaviour of these systems were analysed down to 1.8 K. The effect of the dimensionality of the systems on their op tical and magnetic properties is also discussed.