Synthesis and structure of cobalt(II) complexes with nitrilotris(methylenephosphonic) acid [Co(H2O)3{NH(CH2PO3H)3}] and Na4[Co{N(CH2PO3)3}] ·13H2O

Structural characterization, thermal investigation and biological activity of metal complexes containing Schiff Base ligand (Z)‐3‐(1‐((4,6‐dimethyl‐1H‐pyrazolo[3,4‐b] pyridin‐3‐yl)imino)ethyl)‐4‐hydroxy‐6‐methyl‐2H‐pyran‐2‐one

“…Cobalt(II) complex ( 1 ) displays electronic absorption bands at 498, 632 and 695 nm, assigned to 4 A 2 ’(F) → 4 A 2 ’(P), 4 A 2 ́’(F) → 4 E”(P) and 4 A 2 ́’(F) → 4 E'(F) transitions, respectively. These bands suggest a trigonal bipyramidal geometry for Co(II) complex …”

“…The effective magnetic moment of ( 1 ) is (4.80 BM) as in some of the reported high‐spin cobalt(II) complexes. This is because the orbital contribution to the spin‐only value (3.87 BM) is fairly small, may be due to the presence of a low symmetry ligand field component with tetrahedrally distortion . Cobalt(II) complex ( 1 ) displays electronic absorption bands at 498, 632 and 695 nm, assigned to 4 A 2 ’(F) → 4 A 2 ’(P), 4 A 2 ́’(F) → 4 E”(P) and 4 A 2 ́’(F) → 4 E'(F) transitions, respectively.…”

Coordination Behavior of N‐Donor Schiff Base Derived from 2‐Benzoylpyridine Toward Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Pd(II), and Cr(III) Metal Ions: Synthesis, Spectroscopic and Thermal Studies, and Biological Activity

“…These bands are due to 4 A′ 2 (F) → 4 E′(F), 4 A′ 2 → 4 E″(P), and 4 A′ 2 (F) → 4 A′ 2 (P) transitions. These transitions indicate high‐spin trigonal bipyramidal geometry around cobalt(II) ion . Also, the spectrum of the complex [Ni 4 ( L )Cl 4 (OH) 4 (H 2 O) 4 ].5.25H 2 O.0.25EtOH shows bands at 806, 709, and 513 nm, corresponding to 2 E → 3 A 2 , 3 E → 3 E, and 3 E → 3 A 2 combination with CT transitions, respectively.…”

3d‐metal (Cr to Zn) Nitrilotris(Methylenephosphonate)s with different coordination symmetries: Electronic Structure and Chemical Bond

“…Complexes [Mn II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Mn) [37,38] and [Zn II-(H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Zn) [37,39] used as corrosion inhibitor have been earlier obtained by the interaction of the respective Mn 2 + /Zn 2 + ions with H 6 L, structurally characterized and described. Complexes [Cu II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Cu), [40] [Cr II-(H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Cr), [41] [Co II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Co), [42] [Fe II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Fe), [43] [44] have been recently synthesized by the authors and their structures have been described in detail elsewhere. [37][38][39][40][41][42][43][44] Despite difficulties in preparing I-Cr and I-Fe caused by their extremely low solubility, single-crystals of these complexes have been obtained using the method of crystal growth in gel.…”

“…Complexes [Cu II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Cu), [40] [Cr II-(H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Cr), [41] [Co II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Co), [42] [Fe II (H 2 O) 3 {NH(CH 2 PO 3 H) 3 }] (I-Fe), [43] [44] have been recently synthesized by the authors and their structures have been described in detail elsewhere. [37][38][39][40][41][42][43][44] Despite difficulties in preparing I-Cr and I-Fe caused by their extremely low solubility, single-crystals of these complexes have been obtained using the method of crystal growth in gel. [45] It has been shown [37][38][39][40][41][42][43][44]46,47] that complexes I-M (M=Cr to Zn) form an isostructural series ( Figure 1, structure I).…”