Diacetato(ethylenediamine)zinc(II)

Abstract

CommentLuminescent coordination compounds have been investigated extensively due to their various potential applications in material sciences (Amendola et al. 2006). Many Zn(II) complexes are known to exhibit an intense fluorescence at room temperature (Yang, et al. 2000; Xu, et al. 2006), and they are proposed as candidates for the fluorescent based organic light-emitting diods (OLED) devices (Evans, et al. 2006). The title compound displays distorted tetrahedral coordination, with two N atoms from ethylenediamine and two O atoms from two acetate ligands. The title compound displays [4 + 2] coordination: the "4" represnets the distorted tetrahedral coordination, while the "2" means the two much longer Zn1-O5 distances of 2.594 (2) Å. The asymmetry of the acetate coordination is reflected in the different C-O distances of 1.229 (2) and 1.280 (2) Å. The Zn1 lies on a crystallographic twofold axis. The dihedral angle between N1-Zn1-N1' and O3-Zn1-O3' planes is 85.54 (7) °, where the prime denotes the symetry operation about the twofold axis. While the dihedral angle between N1-Zn1-N1' and O5-Zn1-O5' planes is 29.96 (7) °. N-H···O hydrogen bonding links molecules into a three-dimensional network. The title compound exhibits an intense blue emission at 444 nm in CHCl 3 upon 368 nm excitation. ExperimentalA solution of zinc acetate (2.195 g, 10.0 mmol) and ethylenediamine (0.601 g, 10.0 mmol) in absolute ethanol (50 ml) was stirred for 8 hrs at room temperature under a nitrogen atmosphere. The resulting colorless solution was allowed to stand at room temperature for two weeks to produce colorless crystals (yield 65.0%) suitable for X-ray diffraction. RefinementApart from those of sp 2 -bound methyl groups, which were located in ΔF syntheses, H atoms were positioned geometrically.Thereafter they were constrained to ride on their carrier atoms, with N-H = 0.90 Å and U iso (H) = 1.2U iso (N) for NH 2 , C-H = 0.97 Å and U iso (H) = 1.2U iso (C) for CH 2 , and C-H = 0.96 Å and U iso (H) = 1.5U iso (C) for CH 3 groups.

Organic-sulfur-zinc hybrid nanoparticle for optical applications synthesized via polycondensation of trithiol and Zn(OAc)2

“…A plausible reason for the low n D value of zinc acrylate is the low density originating from the long Zn-O bonds by the ionic character. Typical lengths of Zn-O bonds in zinc carboxylates are 2.0 Å [ 32 - 34 ] and those of the Zn-S bonds in zinc thiolates are 2.2 to 2.3 Å [ 24 - 27 ]. The bond lengths estimated from the single-bond covalent radius are 1.81 and 2.21 Å for the Zn-O and Zn-S bonds, respectively [ 35 ].…”