Structural and spectroscopic studies of transition metal nitrite complexes. VII. Crystal structures and spectra of two dinuclear and trinuclear species with stoichiometry [Ni(methylpyridine)2(NO2)2] containing bridging nitrite groups

1981 ◽  
Vol 34 (10) ◽  
pp. 2125 ◽  
Author(s):  
AJ Finney ◽  
MA Hitchman ◽  
CL Raston ◽  
GL Rowbottom ◽  
AH White
Keyword(s):  
Crystal Structures ◽  
Visible Region ◽  
Spectroscopic Studies ◽  
Coordination Sites ◽  
Ligand Coordination ◽  
Amine Ligands ◽  
Single Oxygen Atom ◽  
Single Oxygen ◽  
Species Being ◽  
Oxygen Bond

The crystal structures of the dimer [Ni(γmpy)2(NO2)2]2,2C6H6 and the trimer [Ni(βmpy)2(NO2)2]3,- C6Hs (γmpy = 4-methylpyridine, βmpy = 3-methylpyridine) are reported, the latter being the redetermination of a structure described previously. The ligand coordination geometry in each oligomer is essentially octahedral, with neighbouring nickel(II) ions being bridged by two nitrite groups, one through a single oxygen atom and the second through an oxygen and the nitrogen atom. The amine ligands occupy trans coordination sites with the terminal bond positions in both species being taken up by chelating nitrite ions. In both compounds the oligomers pack so that the amine rings form sheets with potential voids in the lattice being filled by clathrated benzene molecules. The electronic spectra of the complexes in the visible region are unusual, showing peaks centred at c. 17500 and c. 20500 cm-1, and the assignment of these is discussed. The infrared stretching frequencies of the nitrite groups in these and other compounds are found to correlate well with the observed nitrogen-oxygen bond lengths.

Structural and spectroscopic studies of transition metal nitrite complexes. VI. Crystal structures and spectra of Hexakis(imidazole)nickel(II) dinitrate, trans-Tetrakis(2-methylimidazole)dinitritonickel(II) and cis-Tetrakis(2-methylimidazole)-(nitrito-O,O')nickel(II) nitrate-methanol (2/1)

1981 ◽  
Vol 34 (10) ◽  
pp. 2113 ◽  
Author(s):  
AJ Finney ◽  
MA Hitchman ◽  
CL Raston ◽  
GL Rowbottom ◽  
AH White
Keyword(s):  
Crystal Structures ◽  
Symmetry Axis ◽  
Spectroscopic Properties ◽  
Spectroscopic Studies ◽  
Ligand Field ◽  
Coordination Geometry ◽  
Distorted Octahedral ◽  
Relative Field ◽  
Ligand Coordination ◽  
Fourfold Symmetry

The crystal structures and spectroscopic properties of the complexes cis-tetrakis(2-methy1imidazole)-(nitrito-O,O')nickel(II) nitrate-methanol (2/1) and trans-tetrakis(2-methylimidazole)dinitritonickel(II) are reported. The nitrite group in the former compound chelates, giving a distorted octahedral ligand coordination geometry. The ligand stereochemistry in the second complex is also a distorted octahedron, with both anions coordinating as trans nitrito groups though with significantly different Ni-O bond lengths and the nickel(II) ion being raised out of the plane of the four imidazole ligand nitrogen atoms towards the closer nitrite group. The Ni-O bond directions also deviate substantially from the fourfold symmetry axis in this latter complex. These distortions apparently occur in order to minimize ligand-ligand repulsions, particularly those associated with the amine methyl substituents. The electronic spectra of both complexes show significant band splittings due to the departure of the ligand field from regular octahedral symmetry and these are discussed in terms of the relative field strengths of the imidazole and nitrito ligands. The structure of hexakis(imidazole)nickel(II) nitrate (redetermination) is also reported.

Structural and spectroscopic studies of transition metal nitrite complexes. II. Crystal structures of cis-Bis(ethane-1,2-diamine)(nitrito-O,O')zinc(II) nitrite and trans-Bis[N,N-dimethyl(ethane-1,2-diamine)]dinitritozinc(II)

1981 ◽  
Vol 34 (10) ◽  
pp. 2061 ◽  
Author(s):  
AJ Finney ◽  
MA Hitchman ◽  
CL Raston ◽  
GL Rowbottom ◽  
AH White
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Crystal Structures ◽  
Coordination Polyhedron ◽  
Metal Ion ◽  
Spectroscopic Studies ◽  
Bond Lengths ◽  
Coordination Sites ◽  
Metal Ligand ◽  
Ligand Bond

The crystal structures of the complexes cis-bis(ethane-1,2-diamine)(nitrito-O,O')zinc(II) nitrite and trans-bis[N,N-dimethyl(ethane-l,2-diamine)]dinitritozinc(II) are described. The former compound contains one chelating nitrite, the second group being present as a counter ion. In this complex the coordination polyhedron about the metal ion may be described either as a distorted trigonal bi-pyramid or an octahedron, depending upon whether the chelated nitrite is considered to occupy one or two coordination sites. The second compound is a trans nitrito complex, having an octahedral ligand geometry, though with three markedly different metal-ligand bond lengths. The structures of the complexes are compared with those of analogous nickel(II) nitrite complexes, and the differences are discussed in terms of the electron configurations of the two metal ions.

Structural and spectroscopic studies of transition metal nitrite complexes. VIII. Crystal structures and spectra of three pentanuclear species with stoichiometry [Ni5(N-substituted ethane-1,2-diamine)4(OH)2(NO2)8]

1981 ◽  
Vol 34 (10) ◽  
pp. 2139 ◽  
Author(s):  
AJ Finney ◽  
MA Hitchman ◽  
CL Raston ◽  
GL Rowbottom ◽  
AH White
Keyword(s):  
Transition Metal ◽  
Crystal Structures ◽  
General Formula ◽  
Infrared Spectra ◽  
Spectroscopic Studies ◽  
Molecular Structures ◽  
Structural Variations ◽  
Crystal And Molecular Structures

The preparation of a series of novel compounds of general formula [Ni5L4(NO2)8(OH)2] formed by ethane-1,2-diamine or one of five N-substituted ethane-1,2-diamines (L) is described. The crystal and molecular structures of the ethane-1,2-diamine, N,N'-diethylethane-1,2-diamine and N,N-dimethylethane-1,2-diamine complexes are reported. Each compound contains a planar, pentameric arrangement of nickel(II) ions, linked by bridging hydroxide and nitrite ligands. The details of the nitrite bridges differ among the complexes, causing differences in their electronic and infrared spectra. The structural variations are probably caused by the differing steric requirements of the amine substituents.

Spectroscopic studies, crystal structures and antimicrobial activities of a new lasalocid 1-naphthylmethyl ester

2008 ◽  
Vol 891 (1-3) ◽  
pp. 481-490 ◽  
Author(s):  
Adam Huczyński ◽  
Izabela Paluch ◽  
Małgorzata Ratajczak-Sitarz ◽  
Andrzej Katrusiak ◽  
Joanna Stefańska ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Antimicrobial Activities ◽  
Spectroscopic Studies

Structural and spectroscopic studies of transition metal nitrite complexes. V. Crystal structures and spectra of trans-Tetrakis(pyridine)dinitritonickel(II)-pyridine (1/2), trans-Tetrakis(4-methylpyridine)dinitritonickel(II) and trans-Tetrakis(pyrazole)-dinitritonickel(II)

1981 ◽  
Vol 34 (10) ◽  
pp. 2095 ◽  
Author(s):  
AJ Finney ◽  
MA Hitchman ◽  
CL Raston ◽  
GL Rowbottom ◽  
BW Skelton ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Transition Metal ◽  
Crystal Structures ◽  
Electronic Spectra ◽  
Spectroscopic Studies ◽  
Molecular Structures ◽  
Aromatic Rings ◽  
Paddle Wheel ◽  
Crystal And Molecular Structures ◽  
Infrared Frequencies

The crystal and molecular structures of the compounds [Ni(py)4(ONO)2],2py, [Ni(γmpy),(ONO)2] and [Ni(prz)4(ONO)2] are reported.�All three are trans nitrito complexes, the pyridine (py) compound containing two pyridine molecules of solvation. The aromatic rings in the first two complexes adopt 'paddle wheel' conformations with pitch angles varying between 40 and 70�. The nitrite ions are positioned so as to minimize repulsive interactions with the amines, and it seems likely that these groups bond through oxygen rather than nitrogen because this allows a lesser degree of interligand steric interference. The amine rings in [Ni(prz)4(ONO)2] are orthogonal to the plane containing the nickel and coordinated pyrazole nitrogen atoms; the nitrito groups are disordered between two inequivalent positions, each of which involves hydrogen bonding with the pyrazole NH groups. The nitrite infrared frequencies are similar to those observed for other nickel(II) nitrito complexes except that the antisymmetric NO stretching mode of one of the groups in the pyrazole complex is much lower in energy than expected, being in the range normally associated with a nitrogen-bonded or chelated nitrite group. It is suggested that this deviation may be caused by the hydrogen bonding in the complex. The electronic spectra of the compounds yield 10Dq values of 9100 and 8500 cm-1 for the nitrite ligands in [Ni(py)4(ONO)2] and Ni(prz)4(ONO)2], respectively, placing the nitrito group towards the weaker end of the spectro-chemical series.

Spectroscopic Studies and Crystal Structures of Double Thorium(IV) Oxalates with Sodium Ions

2013 ◽  
Vol 2013 (36) ◽  
pp. 6170-6174 ◽  
Author(s):  
Yingjie Zhang ◽  
Mohan Bhadbhade ◽  
Inna Karatchevtseva ◽  
Jiabin Gao ◽  
Jason R. Price ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Studies ◽  
Sodium Ions

Synthesis, crystal structures and reactivity towards dioxygen of copper(I) complexes with tripodal aliphatic amine ligands

Polyhedron ◽  
2019 ◽  
Vol 171 ◽  
pp. 448-454
Author(s):  
Janine Will ◽  
Christian Würtele ◽  
Jonathan Becker ◽  
Olaf Walter ◽  
Siegfried Schindler
Keyword(s):  
Crystal Structures ◽  
Aliphatic Amine ◽  
Amine Ligands

Synthesis of porphyrins bearing alkynyl- or arylalkynyl-meso-groups

2016 ◽  
Vol 20 (01n04) ◽  
pp. 292-301
Author(s):  
Hervé Dekkiche ◽  
Yoshihiro Kikkawa ◽  
Lydia Karmazin ◽  
Christophe Jeandon ◽  
Romain Ruppert
Keyword(s):  
Crystal Structures ◽  
Sonogashira Coupling ◽  
Synthetic Pathway ◽  
Alkyl Chains ◽  
Coordination Sites ◽  
Porphyrin Derivatives ◽  
Porphyrin Dimers

The synthesis of new porphyrins bearing external coordination sites and long alkyl chains is described. In particular, the possibility to use the Sonogashira coupling to introduce long alkynyl chains and the synthetic pathway to obtain these compounds is detailed. Two crystal structures of these new porphyrin derivatives were obtained. The synthesis of porphyrin dimers linked by a palladium(II) ion is also reported and some electronic consequences presented.

Structural and spectroscopic studies of transition metal nitrite complexes. IV. Crystal structure and spectra of cis-Aquabis[N,N-dimethyl(ethane-1,2-diamine)]-nitronickel(II) perchlorate

1981 ◽  
Vol 34 (10) ◽  
pp. 2085 ◽  
Author(s):  
AJ Finney ◽  
MA Hitchman ◽  
CL Raston ◽  
GL Rowbottom ◽  
AH White
Keyword(s):  
Molecular Structure ◽  
Lower Energy ◽  
Crystal And Molecular Structure ◽  
Visible Region ◽  
Spectroscopic Studies ◽  
Charge Transfer Transition ◽  
Lower Energy Band ◽  
Ligand Charge Transfer ◽  
Vibrational Progression ◽  
Metal Ligand

The crystal and molecular structure of the complex cis-aquabis[N,N-dimethyl(ethane-l,2-diamine)]- nitronickel(11) perchlorate is reported and the stereochemistry is compared with those observed for other nickel nitrite complexes formed by substituted amines. The electronic spectrum of the complex in the visible region is unusual, showing bands with maxima at 17750 and 21000 cm-1. The latter peak consists of a poorly resolved vibrational progression having an interval of c.600cm-1. While the lower energy band is assigned to the second spin-allowed 'd-d' transition of an octahedral nickel(11) complex, it is suggested that the band at 21000 cm-1 is due either to a metal → ligand charge-transfer transition, or to an internal n(O)→ π* nitrite transition.

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