1, 2-, 1, 3- and 1, 4-Cyclohexanedicarboxylates of Cd and Mn with chain and layered structures

Thirumurugan, A.; Avinash, M. B.; Rao, C. N. R.

doi:10.1039/b512843a

Cited by 55 publications

(42 citation statements)

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“…The 1,3-CHDC anion has (1222) connectivity (Figure 8a) and the two 1,4-CHDC anions have a two-fold axis of symmetry with (2222) connectivity (Figure 8b). The Pb(1) and Pb(2) atoms are seven-coordinate and Pb (3) is five-coordinate to oxygen atoms of the three CHDC anions and one independent oxygen atom, O (9). The independent oxygen atom O (9) is tetrahedrally coordinated to four lead atoms to form a OPb 4 tetrahedron.…”

Section: A C H T U N G T R E N N U N G [La 2 a C H T U N G T R E N N mentioning

confidence: 99%

“…[9,10] These include 1,4- 2 ]·2 H 2 O compound, which contains infinite one-dimensional La-O-La linkages. It appears, that while the 1,4-CHDCs of different dimensionalities can be formed, the three-dimensional structures are favored only by these isomers.…”

Section: A C H T U N G T R E N N U N G [La 2 a C H T U N G T R E N N mentioning

confidence: 99%

“…[8] In a recent study of 1,2-, 1,3-and 1,4-cyclohexanedicarboxylates (CHDCs) of Cd and Mn, infinite M-O-M linkages have been found to occur in the 1,2-CHDCs and three-dimensional structures in the 1,4-CHDCs. [9] In view of these observations, we considered it important to explore whether infinite M-O-M linkages are only characteristic of 1,2-CHDCs and CHeDCs, while threedimensional structures are solely formed by the 1,4-CHDCs. More importantly, it was also our purpose to examine whether three-dimensional hybrid structures of CHDCs containing M-O-M linkages can be prepared.…”

Section: Introductionmentioning

confidence: 99%

“…[9] This compound also has a layered structure, possessing infinite two-dimensional Cd-O-Cd linkages. The 1,2-CHDC anions in this compound are in the ee conformation just as in II.…”

mentioning

confidence: 99%

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Lamellar and Three‐Dimensional Hybrid Compounds Formed by Cyclohexene‐ and Cyclohexanedicarboxylates of Pb, La, and Cd

Rao

Thirumurugan

Rao

2007

Chemistry A European J

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To establish factors that determine the formation of three-dimensional hybrid structures of metal dicarboxylates involving metal-oxygen-metal linkages, we have investigated metal dicarboxylates derived from 1,2-cyclohexene as well as 1,2-, 1,3-, and 1,4-cyclohexane dicarboxylic acids. Thus, we have synthesized a 1,2-cyclohexenedicarboxylate of Cd, [Cd(1,2-CHeDC)(H2O)] (I), a 1,2-cyclohexanedicarboxylate of Pb, [Pb(1,2-CHDC)] (II), and three 1,4-cyclohexanedicarboxylates of La [La2(1,4-CHDC)3(H2O)4] (III), [La3(1,4-HCHDC)2(1,4-CHDC)5(H2O)2].H2O (IV) and [La2(1,4-CHDC)3(H2O)].2.5 H2O (V) under hydrothermal conditions and determined their structures. A mixed dicarboxylate involving both 1,3- and 1,4-cyclohexenedicarboxylates of Pb, [Pb3O(1,3-CHDC)(1,4-CHDC)].0.5 H2O (VI) and a 1,4-cyclohexanedicarboxylate of Pb, [Pb(6)O(2)(1,4-CHDC)3(1,4-HCHDC)2], have also been synthesized and characterized. While the 1,2-dicarboxylates have layered structures, the 1,4-dicarboxylates and the mixed dicarboxylates possess three-dimensional structures. Interestingly, both the 1,2 and 1,4-dicarboxylates are true hybrid compounds composed of infinite M-O-M linkages. The equatorial-equatorial (e,e) conformation is adopted commonly in all these compounds, although less stable conformations are encountered occasionally. The formation of the layered and the three-dimensional structures can be understood based on the relative disposition of the two carboxylic groups, the 1,4-isomer favoring the three-dimensional structure. Based on the results of the present study along with the available literature, we conclude that in order to obtain three-dimensional hybrid structures with metal-oxygen-metal networks, it appears necessary to make use of the 1,4-cyclohexanedicarboxylic acid.

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Section: A C H T U N G T R E N N U N G [La 2 a C H T U N G T R E N N mentioning

confidence: 99%

Section: A C H T U N G T R E N N U N G [La 2 a C H T U N G T R E N N mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[9] This compound also has a layered structure, possessing infinite two-dimensional Cd-O-Cd linkages. The 1,2-CHDC anions in this compound are in the ee conformation just as in II.…”

mentioning

confidence: 99%

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Lamellar and Three‐Dimensional Hybrid Compounds Formed by Cyclohexene‐ and Cyclohexanedicarboxylates of Pb, La, and Cd

Rao

Thirumurugan

Rao

2007

Chemistry A European J

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“…Hybrid structures with two-dimensional (2-D) inorganic connectivity (I 2 ) are known in the literature [8,9,[18][19][20][21][22][23][24]. There are very few mixed aliphatic dicarboxylates known today, the only examples, to our knowledge being the neodymium oxalate-glutarate [25], Nd 4 (H 2 O) 2 The pH of the starting reaction mixture was generally in the range 5-6.…”

Section: Introductionmentioning

confidence: 99%

Hybrid structures formed by homo- and heteroleptic aliphatic dicarboxylates of lead with 2-D inorganic connectivity

Thirumurugan¹,

Rao²

2008

Journal of Solid State Chemistry

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Coordination Chemistry of Conformation‐Flexible 1,2,3,4,5,6‐Cyclohexanehexacarboxylate: Trapping Various Conformations in Metal–Organic Frameworks

Wang

Lin

et al. 2008

Chemistry A European J

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To study the conformations of 1,2,3,4,5,6-cyclohexanehexacarboxylic acid (H(6)L), eleven new coordination polymers have been isolated from hydrothermal reactions of different metal salts with 1e,2a,3e,4a,5e,6a-cyclohexanehexacarboxylic acid (3e+3a, H(6)L(I)) and characterized. They are [Cd(12)(mu(6)-L(II))(mu(10)-L(II))(3)(mu-H(2)O)(6)(H(2)O)(6)]16.5 H(2)O (1), Na(12)[Cd(6)(mu(6)-L(II))(mu(6)-L(III))(3)]27 H(2)O (2), [Cd(3)(mu(13)-L(II))(mu-H(2)O)] (3), [Cd(3)(mu(6)-L(III))(2,2'-bpy)(3)(H(2)O)(3)]2 H(2)O (4), [Cd(4)(mu(4)-L(VI))(2)(4,4'-Hbpy)(4)(4,4'-bpy)(2)(H(2)O)(4)]9.5 H(2)O (5), [Cd(2)(mu(6)-L(II))(4,4'-Hbpy)(2)(H(2)O)(10)]5 H(2)O (6), [Cd(3)(mu(11)-L(VI))(H(2)O)(3)] (7), [M(3)(mu(9)-L(II))(H(2)O)(6)] (M=Mn (8), Fe (9), and Ni (10)), and [Ni(4)(OH)(2)(mu(10)-L(II))(4,4'-bpy)(H(2)O)(4)]6 H(2)O (11). Three new conformations of 1,2,3,4,5,6-cyclohexanehexacarboxylate, 6e (L(II)), 4e+2a (L(III)) and 5e+1a (L(VI)), have been derived from the conformational conversions of L(I) and trapped in these complexes by controlling the conditions of the hydrothermal systems. Complexes 1 and 2 have three-dimensional (3D) coordination frameworks with nanoscale cages and are obtained at relatively low temperatures. A quarter of the L(I) ligands undergo a conformational transformation into L(II) while the others are transformed into L(III) in the presence of NaOH in 2, while all of the L(I) are transformed into L(II) in the absence of NaOH in 1. Complex 3 has a 3D condensed coordination framework, which was obtained under similar reaction conditions as 1, but at a higher temperature. The addition of 2,2'-bipyridine (2,2'-bpy) or 4,4'-bipyridine (4,4'-bpy) to the hydrothermal system as an auxiliary ligand also induces the conformational transformation of H(6)L(I). A new L(VI) conformation has been trapped in complexes 4-7 under different conditions. Complex 4 has a 3D microporous supramolecular network constructed from a 2D L(III)-bridged coordination layer structure by pi-pi interactions between the chelating 2,2'-bpy ligands. Complexes 5-7 have different frameworks with L(II)/L(VI) conformations, which were prepared by using different amounts of 4,4'-bpy under similar synthetic conditions. Both 5 and 7 are 3D coordination frameworks involving the L(VI) ligands, while 6 has a 3D microporous supramolecular network constructed from a 2D L(II)-bridged coordination layer structure by interlayer N(4,4'-Hbpy)--HO(L(II)) hydrogen bonds. 3D coordination frameworks 8-11 have been obtained from the H(6)L(I) ligand and the paramagnetic metal ions Mn(II), Fe(II), and Ni(II), and their magnetic properties have been studied. Of particular interest to us is that two copper coordination polymers of the formulae [{Cu(II) (2)(mu(4)-L(II))(H(2)O)(4)}{Cu(I) (2)(4,4'-bpy)(2)}] (12 alpha) and [Cu(II)(Hbtc)(4,4'-bpy)(H(2)O)]3 H(2)O (H(3)btc=1,3,5-benzenetricarboxylic acid) (12 beta) resulted from the same one-pot hydrothermal reaction of Cu(NO(3))(2), H(6)L(I), 4,4'-bpy, and NaOH. The Hbtc(2-) ligand in 12 beta was formed by the in situ decarboxylation...

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1, 2-, 1, 3- and 1, 4-Cyclohexanedicarboxylates of Cd and Mn with chain and layered structures

Cited by 55 publications

References 42 publications

Lamellar and Three‐Dimensional Hybrid Compounds Formed by Cyclohexene‐ and Cyclohexanedicarboxylates of Pb, La, and Cd

Lamellar and Three‐Dimensional Hybrid Compounds Formed by Cyclohexene‐ and Cyclohexanedicarboxylates of Pb, La, and Cd

Hybrid structures formed by homo- and heteroleptic aliphatic dicarboxylates of lead with 2-D inorganic connectivity

Coordination Chemistry of Conformation‐Flexible 1,2,3,4,5,6‐Cyclohexanehexacarboxylate: Trapping Various Conformations in Metal–Organic Frameworks

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