The strong O-H⋯N and O-H⋯O hydrogen bonds involving two types of crystallographically different hexacyanoferrate(III) anions and water molecules in [GdIII(18-crown-6)(H2O)3][Fe III(CN)6]·2H2O result in 3-D assembly consisting of the novel example of interlocked infinite double helices. © The Royal Society of Chemistry 2005.

SASANKA MOHANTA

Chemistry

R KONER

M NAYAK

J N LOW

P MISRA

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

CrystEngComm

The work in this report deals with seven compounds of composition {[Cu II(dmpn)2]3[FeIII(CN) 6]2·6H2O}n (1), {[Cu II(dmpn)2]3[CoIII(CN) 6]2·6H2O}n (2), {[Cu II(dmpn)2]3[CrIII(CN) 6]2·4H2O}n (3), {[Cu II(dmpn)][NiII(CN)4]·H 2O}n (4), [{CuII(dmpn)2Cl}{Cu II(dmpn)2(H2O)}][AgI(CN) 2]Cl2 (5), [(CuII(dmpn) 2(dicyanamide)2] (6) and [(NiII(dmpn) 2(dicyanamide)2] (7), where dmpn = 2,2-dimethyl-1,3- diaminopropane. Syntheses, characterization and crystal structures of 1-7 along with variable-temperature (2-300 K) magnetic properties of 1 and 3 are described. Compounds 1-4 are cyanide-bridged two-dimensional coordination polymers. Twelve metal-membered ring is formed in 1-3, while both four and eight metal-membered rings are formed in 4. On the other hand, dicyanoargentate(I) in 5 is noncoordinated and dicyanamide in 6 and 7 behaves as monodentate terminal ligand. The coordination polymers in 1-4 and the discrete systems in 5-7 are self-assembled by hydrogen bonding interactions to generate overall three-dimensional supramolecular topologies. A novel structural aspect, two-dimensional network containing both four and eight metal-membered rings, has been observed in the copper(II)-tetracyanonickelate(II) compound 4. Magnetic studies reveal ferromagnetic interaction between CuII and Cr III in 3. In addition, spin-orbit coupling of low-spin Fe III or weak antiferromagnetic interaction along with intermolecular antiferromagnetic interactions which exist between CuII and Fe III are present in 1. © 2014 Elsevier Ltd. All rights reserved.

Polyhedron

Discrete systems and two-dimensional coordination polymers containing potentially multidentate and bridging inorganic anions: Observation of a new type of two-dimensional topology

The synthesis, characterization, and structure of a cyano-bridged two-dimensional supramolecule, [CuII(trans-chxn)2] 3[CoIII(CN)6]2·2H 2O (1; chxn = 1,2-diaminocyclohexane), have been described. The title compound crystallizes in the triclinic Pī space group with the unit cell parameters: a = 9.141(5) Å, b = 12.406(5) Å, c = 15.064(5) Å, α = 95.190(5)°, β = 94.460(5)°, γ = 109.510(5)°, V = 1593.0(12) Å3, and Z = 1. The compound contains two crystallographically different copper(II) and cobalt(III) centers. Each of the two copper(II) ions is hexacoordinated by two diamines and two bridging cyanides. Two trans cyanides of one type of hexacyanometalate link one type of copper(II) center to result in one-dimensional chain, while two pairs of trans cyanides of the second type of hexacyanometalate link both the types of copper(II) ions to result in the second dimension. There are extensive hydrogen bonding interactions within the two-dimensional cyano-bridged sheet involving the solvated water molecule, amine groups, and cyanide nitrogens. © 2008 Springer Science+Business Media, LLC.

Journal of Chemical Crystallography

Synthesis, characterization, and structure of a cyano-bridged two-dimensional CuIICoIII coordination polymer derived from trans-1,2-diaminocyclohexane as blocking ligand

Tetra-aqua-(18-crown-6)cerium(III) hexa-cyano-ferrate(III) di-hydrate, [Ce(C12H24O6)(H2O)4][Fe(CN)6]·2H2O, and tetra-aqua-(18-crown-6) neodymium(III) hexa-cyano-ferrate(III) dihydrate, [Nd(C12H24O6)(H2O)4][Fe(CN)6] ·2H2O, are iso-morphous and isostructural in the C2/c space group, where the cations, which contain ten-coordinate lanthanoid centres, lie across twofold rotation axes and the anions lie across inversion centres. In these compounds, an extensive series of O - H⋯O and O - H⋯N hydrogen bonds links the components into a continuous three-dimensional framework. Triaqua-(18-crown-6)lanthanoid(III) hexa-cyano-ferrate(III) di-hydrate, [Ln(C12H24O6)(H2O)3][Fe(CN)6]·2H2O, where Ln = Sm, Eu, Gd or Tb, are all isomorphous and isostructural in the P space group, as are triaqua-(18-crown-6) gadolinium(III) hexa-cyano-chromate(III) dihydrate, [Gd(C12H24O6)(H2O)3][Cr(CN) 6]·2H2O, and triaqua-(18-crown-6)gadolinium(III) hexa-cyano- cobaltate(III) dihydrate, [Gd(C12H24O6)(H2O)3][Co(CN)6]·2H2O. In these compounds, there are two independent anions, both lying across inversion centres, and the lanthanoid centres exhibit nine-coordination; in the crystal structures, an extensive series of hydrogen bonds links the components into a three-dimensional framework. © International Union of Crystallography 2007.

Acta Crystallographica Section C: Crystal Structure Communications

Hydrated hexa-cyano-metallate(III) salts of triaqua-(18-crown-6)lan-than- oid(III) and tetra-aqua-(18-crown-6)lanthanoid(III) cations containing nine- and ten-coordinate lanthanoids

The synthesis, characterization, and crystal engineering of an enolic 4-terpyridone (L1) based three-dimensional supramolecule, [Ni II(L1)2](dicyanamide)2· 2H2O, have been described. One aim of this study has been to demonstrate that the H-O-pyridine-M-pyridine-O-H moiety in [M(L 1)2]n+ can participate in extended hydrogen-bonding interactions and, thus, can act as a building block to generate supramolecular frameworks. A second objective has been to stabilize a coordination compound containing dicyanamide in only noncoordinating form, which in turn would get involved in extended hydrogen bondings. The title compound crystallizes in the triclinic space group P1 with the following unit cell parameters: a = 8.7482(9) Å, b = 9.0810(7) Å, c = 20.5411(18) Å, α = 92.143(7)°, β = 93.011(8)°, γ = 94.315(7)°, and Z = 2. In this compound, the metal center is hexacoordinated by the three pyridine nitrogens of each of the two enolic 4-terpyridones. A number of hydrogen bonds, involving the H-O-pyridine-M-pyridine-O-H moiety and a few C-H hydrogens of the dication as well as the two noncoordinating dicyanamide anions and two waters of crystallization, results in the generation of three-dimensional assembly in this molecule. The fragment analyses reveal the existence of helical dimers and a pair of one-dimensional chains. The overall three-dimensional structure of the title compound can be considered as the stitching of the two-dimensional sheets, which consist of the interlinked pairs of one-dimensional chains, by the second type of one-dimensional chains created due to the attachment of the helical dimers, which in turn consist of the hydrogen-bonded monomers. © 2005 American Chemical Society.

Crystal Growth and Design

Hydrogen-bonded one-dimensional zigzag pairs and helical dimers in an enolic 4-terpyridone based nickel(II) dicyanamide supramolecule

Chemistry - A European Journal

Using Noncovalent Intra-strand and Inter-strand Interactions To Prescribe Helix Formation within a Metallo-supramolecular System

Inorganic Chemistry

The First Enantiomerically Pure Helical Noncovalent Tripod for Assembling Nine-Coordinate Lanthanide(III) Podates

Chemical Reviews

Synthetic Helical Polymers:  Conformation and Function

Angewandte Chemie International Edition

Helical Coordination Polymers with Large Chiral Cavities

Methods in Enzymology,Macromolecular Crystallography Part B

[16] SHELXL: High-resolution refinement

Strongly hydrogen bonded interlocked infinite double helices in a crown ether based gadolinium(III) hexacyanoferrate(III) supramolecule

Journal	CrystEngComm
Publisher	ROYAL SOC CHEMISTRY
ISSN	1466-8033
Open Access	No