Structural researches on metal complexes of polydentate ligands containing carbonyl and α-diimine moieties. III. Crystal structure and spectroscopic properties of bis{dichloro[2,6-diacetylpyridinebis(picolinoylhydrazonato)]dicopper(II)} dihydrate

Abstract

The crystals of the title compound are monoclinic, space group P21/n. There are four molecules in the unit cell of dimensions a = 11-646, b = 22.831, c = 9.172 A, fl = 90-6 °. The structure has been determined from diffractometer data by Patterson and Fourier methods and refined by block-diagonal least-squares calculations to R = 5.7 % for 4707 independent reflexions. The main features in this compound are the presence of two non-equivalent copper atoms, both pentacoordinated, and the octadentate behaviour of the organic ligand which is present in its deprotonated form. The whole structure consists of a tetrameric system of copper atoms connected by two ligand molecules. Infrared and electronic spectra are also discussed.

Investigation into aroylhydrazones as chelating agents. Synthesis and structural characterization of a tin(IV) complex with 2,6-diacetylpyridine bis(salicyloylhydrazone)

“…The unit-cell parameters were obtained by a least-squares fit to the carefully measured values of 15 strong reflections. Crystal data are as follows : C,,H,,N,O,Sn, Orthorhombic, M = 634.30, a = 18.332(10), b = 17.187 (11), G = 9.161(5) A, U = 2 886(3) A3, D, = 1.480 g cm-,, 2 = 4, D, = 1.460,…”

Structural researches on metal complexes of polydentate ligands containing carbonyl and ?-diimine moieties, part V. Heptacoordination in a manganese(II) complex of 2,6-diacetylpyridinebis(picolinoylhydrazone)

“…Further interest arises because the heptacoordination as found in this complex is rather rare for manganese(lI), the only examples being the [Mn(OH2)Y] 2-ion in Mn3(HY)2.10 H20 (Y -= ethylenediaminetetraacetate) (4) and 10,11,12,13-tetrahydrodibenzo-[b, k ]pyrido [g, f] [ 1,4,7,10,13 ]penta-azacyclopentadecin-N s ' Ni0, N 13, N 18_N 19b_di(perchlorato)manganese, C21 H 19NsMn(ClO4)2 (5). spectroscopic properties and the x-ray analysis.…”

Crystal structure of (2-pyridinecarboxaldehydeisonicotinoylhydrazonato) copper(I) thiocyanate, [Cu(C12H9N4O)]NCS

“…The six-membered ring N3-C8-C9-C10-C11-C12 is almost coplanar with the Cu-N3-C8-C7-N2 plane forming ad ihedral angle of 0.9(1)°. The whole hydrazone molecule forms al east squares plane with an rms deviation of fitted atoms of 0.059 Å,from which the N4 atom deviates by 0.505(3) and C1 by 0.266(2) Å.All the bond lengths of the five-and six-membered rings lie in the range observed in a number of pentacoordinated copper(II) complexes [2][3][4][5][6]. The complex is in the enolic form (−C=N−N=), which is also confirmed by the bond lengths of (C6-O) of 1.27 Å and (C6-N1) of 1.33 Å [7].…”