2002
DOI: 10.1002/1521-3749(200202)628:2<468::aid-zaac468>3.0.co;2-j
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The Interaction of α-Hydroxycarboxylic Acids with Metal Ions: Lactic Acid (H2L1) and 2-Methyllactic Acid (H2L2) with Cobalt(II) Crystal and Molecular Structures of [Co(HL1)2(H2O)2]·H2O and [Co(HL2)2(H2O)2]

Abstract: The cobalt(II) complexes [Co(HL 1 ) 2 (H 2 O) 2 ]·H 2 O) (1) and [Co(HL 2 ) 2 (H 2 O) 2 ] (2) [(HL 1 ) Ϫ ϭ (±)-lactate, (HL 2 ) Ϫ ϭ 2-Methyllactate] were prepared and characterized structurally. The cobalt atom is in a distorted octahedral environment in both compounds. Both α-hydroxycarboxylato ligands are O,O'-bidentate chelating monoanions. The presence of a lattice water molecule in 1 makes its

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Cited by 19 publications
(6 citation statements)
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“…In complexes 1 − 4 , the citrate ligand participates in complexation with all of its α-hydroxyl, α-carboxylate, and β-carboxylate groups, resulting in the 2D or 3D network polymers, while in complex 5 , one β-carboxylate group of the citrate ligand is uncoordinated, and hence, the extended structure is only one-dimensional. The Co−O bond distances in 5 are all in the range of 2.036(2)−2.217(2) Å, comparable to other cobalt(II) hydroxycarboxylate complexes . Additionally, the nearest Co···Co separation of two adjacent Co(II) ions is 3.679(2) Å.…”
Section: Resultsmentioning
confidence: 54%
“…In complexes 1 − 4 , the citrate ligand participates in complexation with all of its α-hydroxyl, α-carboxylate, and β-carboxylate groups, resulting in the 2D or 3D network polymers, while in complex 5 , one β-carboxylate group of the citrate ligand is uncoordinated, and hence, the extended structure is only one-dimensional. The Co−O bond distances in 5 are all in the range of 2.036(2)−2.217(2) Å, comparable to other cobalt(II) hydroxycarboxylate complexes . Additionally, the nearest Co···Co separation of two adjacent Co(II) ions is 3.679(2) Å.…”
Section: Resultsmentioning
confidence: 54%
“…The other Co−O distances in 2 − 4 are in the normal range, which are similar to those observed in the other cobalt(II) citrate complexes. ,,, Moreover, these Co−O distances are also comparable to those in the other cobalt(II) hydroxycarboxylate complexes. Such as [Co( S -Hmal)(H 2 O) 2 ] n ·2 n H 2 O [2.067(3)−2.136(3) Å], trans -[Co( R , S -H 2 mal) 2 (H 2 O) 2 ]·2H 2 O [2.066(1)−2.112(1) Å] (H 3 mal = malic acid), [Co 2 ( R , R -H 2 tart) 2 (H 2 O) 2 ] n ·3 n H 2 O [2.04(1)−2.16(1) Å] (H 4 tart = tartaric acid), [Co(Hglyc) 2 ] n [2.053(1)−2.118(1) Å] (H 2 glyc = glycolic acid), [Co( R , S -Hlact) 2 (H 2 O) 2 ]·H 2 O [2.018(3)−2.129(3) Å] (H 2 lact = lactic acid), and [Co[CO 2 C(OH)(CH 3 ) 2 ] 2 (H 2 O) 2 ] [2.023(2)−2.090(2) Å] . The Co1−Co1i distance in 2 is 5.348(1) Å, which is very similar to those observed in K 2 [Co 2 (Hcit) 2 (H 2 O) 4 ]·6H 2 O [5.247(1) Å], Na 2 [Co 2 (Hcit) 2 (H 2 O) 4 ]·6H 2 O [5.361(1) Å], K 2 [Ni 2 (Hcit) 2 (H 2 O) 4 ]·6H 2 O [5.364(1) Å], and Co 3 (Hcit) 2 (4,4‘-bpy) 4 (H 2 O) 2 ·4H 2 O [5.378(1) Å] (bpy = 4,4‘- bipyridine) 26 but is longer than that observed in 4 [4.955(2) Å].…”
Section: Resultsmentioning
confidence: 99%
“…In (1), the Co atom is attached to two chelating glycolate ligands and two water molecules; the coordination polyhedron is a distorted octahedron with the main deviations from regularity affecting the bite angles O hydroxyl ÐCoÐ O carboxy [77.61 (5) and 76.46 (5) ], which are similar to those observed in other -hydroxycarboxylate±cobalt(II) complexes (Carballo et al, 2002;Karipides, 1981;Matzapetakis et al, 2000;Medina et al, 2000). The con®guration around the cobalt center is all-cis [OC-6-32 in the CPI system (von Zelewsky, 1996) with the priority order O 1 (1) > O 2 (2) > O water (3)], which is the same as that in the lactate±cobalt(II) complex (Carballo et al, 2002), whereas (2) is all-trans [OC-6-12, priority order…”
Section: Commentmentioning
confidence: 56%
“…The -hydroxycarboxylate ligands usually form ®vemembered chelate rings in which the metal±O carboxy distances are shorter than the metal±O hydroxy distances (see, for example, Karipides, 1981;Matzapetakis et al, 2000;Medina et al, 2000). However, as we previously observed in the lactate± cobalt(II) complex (Carballo et al, 2002), one of the HG À ligands shows a different behavior [CoÐO23 = 2.0877 (13) A Ê and CoÐO21 = 2.1051 (13) A Ê ].…”
Section: Commentmentioning
confidence: 59%
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