Structural investigations of metal nitrate complexes. Part I. Crystal and molecular structure of bis[dinitratobis(pyridine)copper(II)]–pyridine [Cu(NO₃)₂(py)₂]₂,py

Abstract

Structural Investigations of Metal Nitrate Complexes. Part I. Crystal and Molecular Structure of Bis[d initrato bis( pyrid ine)copper( ii)]-Pyridi ne c c u ( N 0 3 ) 2( PY 1 2 1 2lPY t By

Schiff-base complexes of calcium: crystal structure analysis of dinitrato[N,N'-propane-1,3-diylbis(salicylideneimine)]calcium(II) and the spectroscopic properties of some related complexes

“…As in Ca(H2salpd)(NO3) 2 the bridging atom has the longest bond to N (1.284 A) but the other two N--O distances are not equal (1.219 and 1.230 A). There is a similar arrangement (Cameron, Forrest, Taylor & Nuttall, 1971) for bridging (NO3)-in [Cu(NOa)2(py)2]py but here the bridging Cu-O lengths differ considerably (2.042 and 2.542 A), but as in our compound the two N-O lengths not involved in the bridge are equal (1.228 A).…”

Studies of the rhenium-oxygen bond. III. The crystal and molecular structure of 1-oxo-6-ethoxo-2,4-dichloro-3,5-dipyridinerhenium(V)

“…It may be that in the monomer species the trans arrangement of the pyridine groups is more stable. Octahedral or pseudo-octahedral complexes having two pyridine groups attached to the central metal show both cis and trnns arrangements (26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42). It is notable, however, that cis arrangements of the pyridine groups only occur where the remaining coordinated groups are not very large or sterically demanding (26)(27)(28)(29)(30).…”

“…It is notable, however, that cis arrangements of the pyridine groups only occur where the remaining coordinated groups are not very large or sterically demanding (26)(27)(28)(29)(30). In compounds containing ligands such as halogens the pyridine ligands are trans (31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42). It appears therefore, that steric requirements will generally cause pseudo-octahedral complexes which contain two pyridine groups to have a trans arrangement of the pydrine groups.…”

3D hydrogen-bonded network built from copper(II) complexes of 1,3-propanediamine

“…17 For instance, Valdéz-Martinez et al 18 considered the coordination of the NO 3 -groups at the axial positions of [Cu(NO 3 ) 2 (MeTSC) 2 ], which exhibited Cu-O bond length of 2.864(3) Å. Copper-oxygen bond of 2.906(7) Å was also considered significant in the molecular structure of [Cu(NO 3 ) 2 (py) 2 ] 2 ·py (py = pyridine). 19 Anyway, if one takes into account that Cu1-O3 and Cu2-O9 are nonbonding distances, the metal coordination polyhedron in 1 and 2 could alternatively be described as distorted square pyramidal.…”

“…17 For instance, considered the coordination of the NO 3 -groups at the axial positions of [Cu(NO 3 ) 2 (MeTSC) 2 ], which exhibited Cu-O bond length of 2.864(3) Å. Copper-oxygen bond of 2.906(7) Å was also considered significant in the molecular structure of [Cu(NO 3 ) 2 (py) 2 ] 2 ·py (py = pyridine). 19 Anyway, if one takes into account that Cu1-O3 and Cu2-O9 are nonbonding distances, the metal coordination polyhedron in 1 and 2 could alternatively be described as distorted square pyramidal.The azide and nitrate groups participate in a series of hydrogen bonds which are responsible for the stabilization of the crystal structure. Table 4 lists the distances and angles of hydrogen bonds and C-H···O interactions in the co-crystal.…”