Three mononuclear copper complexes of 9-hydroxy-9H-fluorene-9-carboxylic acid

Syntheses and crystal structures of two Zn(II) complexes, [Zn(Fura)2(2,2′-bipy)(H2O)] and [Zn(μ-dnbc)2] (Fura=Furoic acid, 2,2′-bpy=2,2′-bipyridine, dnba=3,5-dinitrobenzoic acid)

“…For 2 as (COO À ) and s (COO À ) of dnba appeared at 1629 and 1472 cm À1 respectively, the characterization absorption bands of NO À 3 were observed at 1415 and 1344 cm À1 respectively. Á as ðcoo À ÞÀ s ðcoo À Þ is 157 cm À1 , indicating that dnba is bridging bidentate [17]. The results of IR spetral analyses are consistent with those of X-ray diffraction analysis.…”

A 1D → 3D Two‐Fold Interpenetration Array Formed by Hydrogen‐Bonding Interactions

“…A special group is composed by the extended architectures that are assembled from low‐dimensional (0D, 1D, or 2D) coordination polymeric species interconnected by weaker hydrogen‐bonding interactions 4–6. Such 3D interpenetrated frameworks formed by hydrogen bonding interactions are more flexible than the networks entirely based on coordination bonds and thus may have potential applications ranging from drug‐delivery vehicles to sensor devices in biochemical processes 7.…”

Hydrothermal synthesis and crystal structure of a neutral cyclic tetranuclear cobalt(II) complex with 5-nitrosalicylate and 1,10-phenanthroline ligands

“…The splitting of the vibration bands of salicylate group (1439, 1427 cm À1 ) indicates that the COO À groups function in different coordination fashions. The difference between the asymmetric and symmetric stretching vibrations (Dv = v as (COO À )-v s (COO À )) indicates that the 5-nitrosalicylate anions coordinated as a bidentate chelating, or bridging carboxylic group [11]. A band at 1513 cm À1 is assigned to v as (aromatic NO 2 ), a band at 1321 cm À1 is assigned to v s (aromatic NO 2 ) and a band at 842 cm À1 is assigned to C@N stretching vibration of 1,10- (7), O(7)-Co(2)-N(6) 100.44 (8), O(l)-Co(2)-N(6) 84.83 (8), N(5)-Co(2)-N(6) 77.68 (8), O(8)-Co(2)-O(2) 92.57 (8), O(7)-Co(2)-O(2) 100.45 (7), O(l)-Co(2)-O(2) 58.16 (6), N(5)-Co(2)-O(2) 155.78 (7), N(6)-Co(2)-O(2) 90.28 (7).…”