307 KB28 KB199820252018Jagličić, ZvonkoPoleti, DejanRadovanović, LidijaRodić, Marko V.Rogan, Jelenaštevilka:1letnik:65str. 191-198ISSN:1580-3155COBISSID_HOST:18506841URN:URN:NBN:SI:doc-SVUJJHVNenSlovensko kemijsko društvoActa chimica slovenica1,4-benzenedicarboxylateCo(II)discrete complexmagnetismNi(II)Diaquabis(2,2'-dipyridylamine)M(II) terephthalate dihydrates, M(II) = Ni, Co: synthesis, crystal structures, thermal and magnetic properties|Two new isostructural M(II) (M = Ni, Co) complexes with 2,2'-dipyridylamine (dipya) and dianion of terephthalic acid (?${\rm H_2}\text{tpht}$?), ?${\rm M({dipya})_2 (H_2O)_2 ({tpht}) \cdot 2H_2O}$?, have been synthesized by ligand exchange reaction and characterized by single-crystal X-ray diffraction, FTIR spectroscopy, TG/DSC analysis and magnetic measurements. The crystal structures of ?${\rm M({dipya})_2 (H_2O)_2 ({tpht}) \cdot 2H_2O}$? consist of discrete complex units in which M(II) adopts deformed octahedral geometries. Two dipya ligands and two water molecules are coordinated to M(II) atom, tpht acts as a counter ion, while additional two water molecules remained uncoordinated. By numerous hydrogen bonds, all structural fragments are connected in three different chains which extend along 100, 010 and 001 directions, giving as a result a complex 3D network. The stabilization of 3D structure is accomplished by non-covalent face to face ?$\pi - \pi$? interactions among pyridyl ring of dipya and benzene ring of tpht from adjacent chains. Towards the applied magnetic field, the both complexes exhibited almost perfect paramagnetic behaviorZ reakcijo izmenjave ligandov smo sintetizirali dva nova izostrukturna M(II) (M = Ni, Co) kompleksa z 2,2'-dipiridilaminom (dipya) in dianionom tereftaline kisline (?${\rm H_2}\text{tpht}$?),?${\rm M({dipya})_2 (H_2O)_2 ({tpht}) \cdot 2H_2O}$?, in ju okarakterizirali z monokristalno rentgensko difrakcijo, FTIR spektroskopijo, TG/DSC analizo in magnetnimi meritvami. Kristalni strukturi ?${\rm M({dipya})_2 (H_2O)_2 ({tpht}) \cdot 2H_2O}$? sta zgrajeni iz izoliranih kompleksnih enot, v katerih ima M(II) ion popačeno oktaedrično geometrijo. Dva dipya liganda in dve molekuli vode so koordinirani na M(II) ion, tpht je protiion, preostali dve molekuli vode sta v strukturi nekoordinirani. Strukturni fragmenti so povezani preko številnih vodikovih vezi v tri verige vzdolž 100, 010 in 001 smeri, kar vodi do nastanka 3D mreže. Stabilizacija 3D strukture je dosežena z nekovalentnimi ?$\pi - \pi$? interakcijami med piridinskimi obroči dipya ligandov in benzenovih obročev tpht anionov iz sosednjih verig. V magnetnem polju izkazujeta oba kompleksa popolno paramagnetno obnašanjeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaSlovensko kemijsko društvo