Crystal and molecular structure, spectroscopy, and magnetism of diaquobis(imidazole)catena-.mu.-(squarato-1,3)-nickel(II). A one-dimensional polymer

Ooijen, J. A. C. Van; Reedijk, J.; Spek, Anthony L.

doi:10.1021/ic50195a002

Cited by 79 publications

(31 citation statements)

References 5 publications

(3 reference statements)

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“…The C-O bond length of 1.259 (9) A has been reported by Macintyre & Werkema (1964)for potassium squarate monohydrate. However, van Ooijen, Reedijk & Spek (1979) found essentially the same distance [1.251 (2)A] for C-O squarate bond lengths with both uncoordinated O and with an O coordinated to Ni n. The average of 1.45 it for the four C-C bond lengths also agrees well with the average of 1.456 (10)A given by Macintyre & Werkema (1964) for the squarate ion. The C(3)-C(4) bond is 0.03 A longer than the average as may be expected from the coordination of the squarate ion.…”

Section: Description and Discussion Of Structuressupporting

confidence: 82%

“…The C(3)-C(4) bond is 0.03 A longer than the average as may be expected from the coordination of the squarate ion. These values are all slightly less than the average of 1.467 (5)A reported by van Ooijen et al (1979). The slow rate of formation of this compound is understood in terms of the inertness of the Cr nI ion with respect to inner-sphere substitution, since four Cr-O links must be broken for the formation of each bridged dimer unit, assuming Cr(H20) 3+ as the starting unit in the synthesis.…”

Section: Description and Discussion Of Structuresmentioning

confidence: 66%

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Chromium squarates: Cr(C₄O₄)(OH).3H₂O and Cr(C₄O₄)_3/2.7H₂O

Chesick¹,

Doany²

1981

Acta Crystallogr Sect B

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Abstract[Cr(C404)3/2 . 7H20], CsCrO 6. 7H20, monoclinic, C2/c, a= 14.878 (5), b= 15.434 (3), c= 11.500 (3)/~, t= 112.33 (6) ° , V= 2442.7/~3, Z= 8, Do= 1.89, De= 1.88 Mg m -3. R =0.044 for 1956 reflections. One complete squarate ion exists in the asymmetric unit, and another half squarate exists in the asymmetric unit with four atoms on a twofold rotation axis. The hexaaquachromium(III) ion is hydrogen bonded to the squarate ions and to the remaining water molecule in the asymmetric unit.

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Section: Description and Discussion Of Structuressupporting

confidence: 82%

Section: Description and Discussion Of Structuresmentioning

confidence: 66%

Chromium squarates: Cr(C₄O₄)(OH).3H₂O and Cr(C₄O₄)_3/2.7H₂O

Chesick¹,

Doany²

1981

Acta Crystallogr Sect B

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“…Jaggi and Oswald [7] found short Cu -OH distances of 193 and 194 pm in Cu(OH)2, and Subrata Ghose and Fehlmann [8] re ported Cu-OH bond lengths in the range from 189.4 to 194.9 pm in clinoclas (Cu3A s0 4(0 H )3), whereas Cu -H20 distances should have greater values like the 236 pm found in Cu(HCOO)2-4 H20 [9]. In NiC40 4(C3N2H4)4(H20 )2 [2] the N i-H 20 dis tance is 206.9 pm, whereas the Ni -Osquarate bond length is 212.1 pm. At the same time the H20 molecules are involved in strong hydrogen bonds with the squarate oxygen atoms not linked to Ni2+.…”

Section: Description Of the Structure And Discussionmentioning

confidence: 99%

Synthesis and Crystal Structure of CuC₄O₄·2 H₂O

Robl¹,

Weiss²

1986

Zeitschrift Für Naturforschung B

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Abstract The monoclinic compound CuC4O4·2 H2O (space group P 21/c) was prepared from aqueous acetate buffered solution. The structure was solved from a twinned crystal. Chains consisting of squarate dianions and Cu2+ , which is coordinated octahedrally in a strongly distorted manner, are the main feature. Only two squarate oxygen atoms contribute considerably to the coordination of Cu2+. Neighbouring chains share common oxygen atoms (H2O . Osquarate) of the coordination polyhedra. Furthermore the chains are very probably interlinked by strong hydrogen bonds. Thermal decomposition of CuC4O4·2 H2O leads to CuO.

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“…and trans for 1a), inducing the pyridyl moiety to act as a better σ-donor in 2a. The NiϪO w bonds are relatively weak [15,16] compared to other aquated Ni II systems. The presence of intermolecular hydrogen-bonding accounts for the lengthening of the NiϪO w bonds, and is primarily an electronic effect.…”

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confidence: 89%