(Croconato-κ²O,O′)bis(1,10-phenanthroline-κ²N,N′)manganese(II)

Abstract

The title complex, [Mn(C5O5)(C12H8N2)2], lies across a crystallographic twofold axis which passes through the Mn atom and bisects the croconate ligand. The two 1,10-phenanthroline (phen) ligands are arranged in a propeller manner and the local mol­ecular geometry of the MnN4O2 unit is severely distorted octa­hedral. This may be inter­preted as a structural perturbation of the MnN4 square by the croconate ligand. In the crystal structure, the dipole moments of the mol­ecules are arranged alternately along the +b and −b directions. All the phen ligands are involved in π stacking inter­actions, alternately along the [110] and [10] directions. The alternate spacings between the neighbouring phen planes in the one-dimensional π stacks are 3.361 (2) and 3.526 (2) Å.

(Croconato-κ2O,O′)bis(1,10-phenanthroline-κ2N,N′)zinc(II)

“…The C?O bond involving coordinated O atoms is longer than that involving the uncoordinated O atoms. In the title complex, the C?O bond lengths are 1.229 (3) Å and 1.228 (4) Å for the uncoordinated O atoms and 1.277 2 Compared with our previous reported result (Chen et al 2005(Chen et al , 2007(Chen et al , 2008 motif for crystal of Ni, Co, and Zn complexes are P bcn , while it is C2/c for Cu and Mn complexes. As for the molecular configuration, the dihendral angles between the two phen planes for the complexes of Zn, Co, Ni are 87.7 (1)°, 85.7 (1)°, 86.0 (1)° which are almost perpendicular to each other, but they are 46.5 (1)° and 40.7 (1)° for Cu and Mn complexes.…”

“…For related literature, see: Braga et al (2002); Carranza et al (2004); Castro et al (1992Castro et al ( , 2002; Chen et al (2005Chen et al ( , 2007Chen et al ( , 2008; Faus et al (1994); Maji et al (2003); Seitz & Imming (1992); Sletten et al (1998); Wang et al (2002).…”

“…Recently, many research activities have focused on the synthesis of hybrid framework by incorporate organic ligand in the structure of phen-based complexes. Among the family of cyclic oxocarbons of the formula (CO) n 2-[n=2-6 for oxalate, deltate, squarate, croconate and rhodizonate anions, respectively], the croconate moiety, (C 5 O 5 ) 2-, was found to be a good candidate and has been successfully incorporated into phen-based frameworks in (Chen et al, 2005(Chen et al, , 2007(Chen et al, , 2008. Here, we report a new member of this family: [Zn(phen) 2 (C 5 O 5 )].…”

Bis(2,2′-bipyridine-κ2N,N′)(croconato-κ2O,O′)nickel(II)

“…For the synthesis, see: Chen et al (2008). For related structures, see: Chen et al (2005Chen et al ( , 2007.…”

“…Data collection: APEX2 (Bruker, 2005); cell refinement: APEX2; data reduction: APEX2; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: WinGX (Farrugia, 1999). The croconate C 5 O 5 2anion has attracted increasing attention in recent years because this polydentate ligand gave rise to a variety of interesting complexes (Chen et al, 2008;Coronado et al, 2007;Chen et al, 2005;Wang et al, 2002;).…”