Synthesis and crystal structure of [La(phen)(2)(H2O)(2)(NO3)(2)]NO3 center dot 2(phen)(H2O) with phen=1,10-phenanthroline

摘要

The title compound [La(phen)(2)(H2O)(2)(NO3)(2)]-(NO3) . 2(phen)(H2O) with phen = 1,10-phenanthroline was prepared by the stoichiometric reaction of La(NO3)(3) . 6H(2)O and 1,10-phenanthroline monohydrate in a CH3OH-H2O solution. The crystal structure (triclinic, P (1) over bar (no.2), a = 11.052(2), b = 13.420(2), c = 16.300(2) Angstrom, alpha = 78.12(1)degrees, beta = 88.77(1)degrees, gamma = 83.03(1)degrees, Z = 2, R = 0.0488, wR(2) = 0.1028) consists of [La(phen)(2)(H2O)(2)(NO3)(2)](2+) complex cations, NO3- anions, phen and H2O molecules. The La atom is 10-fold coordinated by four N atoms of two bidentate chelating phen ligands and six O atoms of two H2O molecules and two bidentate chelating NO32- ligands with d(La-O) = 2.522-2.640 Angstrom and d(La-N) = 2.689-2.738 Angstrom. The intermolecular pi-pi stacking interactions play an essential role in the formation of two different 2D layers parallel to (001), which are formed by complex cations and uncoordinating phen molecules, respectively. The uncoordinated NO3- anions and H2O molecules are sandwiched between the cationic and phen layers. [References: 10]