Crystal structure and electronic properties of bis(2,2′-bipyridyl)-nitratocopper(II) nitrate monohydrate

An enolato-bridged dinuclear Cu(ii) complex with a coumarin-assisted precursor: a spectral, magnetic and biological study

“…This indicates that the two ions, separated by 3.429 Å, are not interacting, in agreement with the EPR behaviour of other Cu dimeric complexes reported in the literature. 62 If R o1, the greater contribution to the ground state arises from the Cu-d z 2 orbital, while if R 4 1 this arises from Cu-d x 2 Ày 2 orbital. This suggests a geometric distortion when lowering the temperature, which determines a slight x, y anisotropy.…”

Pseudo-Jahn–Teller complexes: the structures of nitritobis(1,10-phenanthroline)copper(II) tetrafluoroborate (I), [Cu(C12H8N2)2(NO2)]BF4, and acetatobis(1,10-phenanthroline)copper(II)tetrafluoroborate dihydrate (II), [Cu(C12H8N2)2(C2H3O2)]BF4.2H2O

“…A Cu H complex with D 3 symmetry, such as [Cu(phen)a] 2+, has an 2E electronic ground state and is susceptible to Jahn-Teller distoi'tion (Jotham & Kettle, 1971). If one of the phen groups is replaced by a chelating OXO-group, the resulting symmetry is C2 and the electronic degeneracy is lifted: the 2E term splits into a 2.4 ground state and a 2B excited state (Procter, Clifford, Counihan, Fitzgerald, Serf, Simmons, Tyagi & Hathaway (1982); (3) Simmons, Alcock, ; (4) this work; (5) ; (6) Walsh, Walsh, Murphy & Hathaway (1981); (7) ; (8) Simmons, Clearfield, Fitzgerald, Tyagi & Hathaway (1983); (9) Fitzgerald & Hathaway (1981); (10) Hathaway (1983); (I 1) Escobar & Wittke (1983); (12) Fereday, Hodgson, Tyagi & Hathaway (1981);Nakai (1980 Hathaway, Billing, Dudley & Nicholls, 1969 (Bersuker, 1975;Burdett, 1980). Thus, an isolated [Cu(phen or bpy)2(OXO)] + cation is unsusceptible to distortion unless a vibronic coupling of the 2A and 2B electronic states occurs, in which case static C2 symmetry cannot be retained.…”

“…The nitrito ligand is nearly symmetric in its coordination to Cu ~I. The crystal structures of six other such complexes have since been determined: [Cu(bpy)2(ONO)]BF 4 (Walsh, Walsh, Murphy & Hathaway, 1981), [Cu(bpy) 2-(ONO)]PF 6 , [Cu(bpy)2(CH3COE)]BF 4 and [Cu(bpy)2(CH 3-CO2)]C104.H20 (Hathaway, Ray, Kennedy, O'Brien & Murphy, 1980), [Cu(bpy)E(ONOE)]NOa.H20 (Nakai, 1980;Fereday, Hodgson, Tyagi & Hathaway, 1981), and [Cu(bpy)2(HCO2)]BF4.½H20 (Fitzgerald & Hathaway, 1981). It is found that the molecular geometry varies significantly between corresponding pairs of 'cation-distortion isomers', a result, apparently, of differing crystalline environments.…”

Experimental Sensing and DFT Mechanism of Zn(II) Complex for Highly Sensitive and Selective Detection of Acetone

“…Late transition metal ions (e.g., d 10 systems) coordinated to entities capable of supramolecular interactions, such as N-or O-based ligands, can fluoresce remarkably [16][17][18][19][20]. In the recent past, luminescent properties of Zn(II) coordination complexes of 2,2'-bipyridyl (bpy) has been studied which possesses essential properties both in the solid state [21,22] and in solution [23,24].Most importantly, it has a π conjugated system that can be utilized for photoluminescence. It is well-known that Zn 2+ , Cd 2+ , and Ln 3+ are usually adopted as luminescent cations, and we shall exploit these in our future work.…”