Syntheses, Structures, and Characterization of Two Manganese(II)‐Aminobenzoic Complexes

Abstract

A discrete tetranuclear manganese(II) complex, {(H 3 O) 2 -Mn 4 (4-Haba) 2 (4-aba) 6 (SCN) 4 (H 2 O) 2 ]} (1) and a two-dimensional coordination polymer [Mn(3-aba) 2 ] n (2) (4-Haba = 4-aminobenzoic acid, 3-Haba = 3-aminobenzoic acid), have been synthesized and characterized by elemental analyses, IR, X-ray crystallography, and magnetic susceptibility. In complex 1, 4-aba in three types of coordination modes connects Mn II centers to form a discrete tetranuclear anionic molecule. Hydrogen bonding interaction links the tetranu-

Synthesis, Crystal Structure, and Magnetic Properties of Two Manganese(II) Polymers Bearing Ferrocenecarboxylato Ligands

“…Thus, they induce a much larger |J| (J 2 = -29.56 cm -1 ) than that (J 1 = -0.15 cm -1 ) in the trimer of 1 and those (J 1 = -0.27 cm -1 , J 2 = -1.28 cm -1 ) in 2. The intratrimer J (J 1 = -0.27 cm -1 ) and intertrimer J (J 2 = -1.28 cm -1 ) of 2 are in the range reported for one syn-anti carboxylato bridge (-0.1 to -0.4 cm -1 ) [5,17,21] and two synanti carboxylato bridges (-0.9 to -1.7 cm -1 ), [16,17,20] respectively. This confirms again that the magnitude of |J| increases with the number of carboxylato bridges.…”

“…[19,20] The adjacent trinuclear units of 1 are bridged by four synsyn µ 2 -1,3-carboxylato ligands which are much more efficient pathways for superexchange than syn-anti µ 2 -1,3-carboxylato bridges. Thus, they induce a much larger |J| (J 2 = -29.56 cm -1 ) than that (J 1 = -0.15 cm -1 ) in the trimer of 1 and those (J 1 = -0.27 cm -1 , J 2 = -1.28 cm -1 ) in 2.…”

A 2D Layered Metal–Organic Framework Constructed by Using a Hexanuclear Manganese Metallamacrocycle as a Supramolecular Building Block

“…[8] In 1, the amino group of the ligand is singly deprotonated, and the ligand is in a trianionic state. The bond between the carbon atom of the aromatic phenyl ring and the nitrogen atom of the amino group in the nondeprotonated state has C-N single-bond character, [8,9] whereas the corresponding bond in the singly deprotonated state has double-bond character (see Table 1). [10] [a] Symmetry code: -x + 1, -y, -z for 1; -x + 1, -y + 2, -z for 2.…”

Crystal Structures and Magnetic Properties of 2D Supramolecular Architectures Assembled from Benzimidazolecarboxylato‐Bridged 1D Double‐Stranded Coordinating Chains Featuring Metallomacrocycles as Subunits

“…[4a,24] The effect of the far less common chelating-bridging tridentate mode of carboxyl groups in 1 may be looked on as a combination of the syn-anti configuration and the µ-O bridges. [25] DFT calculations on Mn-O-Mn systems indicate a stronger antiferromagnetic coupling when the Mn-O-Mn angle is below 98°and a weak antiferromagnetic response for angles in the ca. 98-110°range.…”