Self-assembly of [H4(cyclam)]Cl4(cylam = 1,4,8,11-tetraazacyclotetradecane) into a 3-D polymeric network with microchannels that sustain a symmetrical 1-D polymer of water molecules

1993 ◽  
pp. 952 ◽  
Author(s):  
S. Subramanian ◽  
Michael J. Zaworotko
Keyword(s):  
Self Assembly ◽  
Water Molecules ◽  
Polymeric Network

scholarly journals Substrate wettability guided oriented self assembly of Janus particles

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Meneka Banik ◽  
Shaili Sett ◽  
Chirodeep Bakli ◽  
Arup Kumar Raychaudhuri ◽  
Suman Chakraborty ◽  
...  
Keyword(s):  
Self Assembly ◽  
Janus Particles ◽  
Water Molecules ◽  
Functional Coatings ◽  
Hexagonal Close Packed ◽  
Local Densities ◽  
Inhomogeneous Properties ◽  
Metal Polymer ◽  
Specific Orientation

AbstractSelf-assembly of Janus particles with spatial inhomogeneous properties is of fundamental importance in diverse areas of sciences and has been extensively observed as a favorably functionalized fluidic interface or in a dilute solution. Interestingly, the unique and non-trivial role of surface wettability on oriented self-assembly of Janus particles has remained largely unexplored. Here, the exclusive role of substrate wettability in directing the orientation of amphiphilic metal-polymer Bifacial spherical Janus particles, obtained by topo-selective metal deposition on colloidal Polymestyere (PS) particles, is explored by drop casting a dilute dispersion of the Janus colloids. While all particles orient with their polymeric (hydrophobic) and metallic (hydrophilic) sides facing upwards on hydrophilic and hydrophobic substrates respectively, they exhibit random orientation on a neutral substrate. The substrate wettability guided orientation of the Janus particles is captured using molecular dynamic simulation, which highlights that the arrangement of water molecules and their local densities near the substrate guide the specific orientation. Finally, it is shown that by spin coating it becomes possible to create a hexagonal close-packed array of the Janus colloids with specific orientation on differential wettability substrates. The results reported here open up new possibilities of substrate-wettability driven functional coatings of Janus particles, which has hitherto remained unexplored.

A heterometallic Cd/Ag/Se complex incorporating 3-ferrocenyl-5-(2-pyridyl)pyrazolato (fcpp) ligands: synthesis and structure of [Cd2{Ag(SePh)}2(μ3-OH2)2(μ2,η3-fcpp)4]·2C3H6O

2019 ◽  
Vol 74 (6) ◽  
pp. 527-531
Author(s):  
Zhe Qian ◽  
Ai-Quan Jia ◽  
Feng Hu ◽  
Cai-Xia Zhang ◽  
Qian-Feng Zhang
Keyword(s):  
Self Assembly ◽  
Selenium Atom ◽  
Water Molecules ◽  
Heterometallic Complex ◽  
Coordination Environment ◽  
Water Solvent ◽  
Acetone Water ◽  
Distorted Octahedral ◽  
Distorted Tetrahedral Coordination ◽  
Distorted Octahedral Coordination Environment

AbstractA self-assembly reaction of Cd(NO3)2 · 4H2O, 3-ferrocenyl-5-(2-pyridyl)-pyrazole (Hfcpp), [Ag(SePh)]n, and Et3N in a mixed acetone-water solvent resulted in the formation of a heterometallic complex [Cd2{Ag(SePh)}2 (μ3-OH2)2(μ2,η3-fcpp)4] · 2C3H6O (1) with a phenylselenolate ligand. The two cadmium and two silver centers are linked by four [μ2,η3-fcpp]− ligands and two μ3-OH2 water molecules. Each Cd atom is in a slightly distorted octahedral coordination environment, while each Ag atom shows a distorted tetrahedral coordination geometry, which is composed of two pyrazolyl nitrogen atoms, one selenium atom, and one oxygen atom.

Self-Assembly of a Mixed-Ligand Metal-Coordination Polymeric Network of Cadmium(II) Croconate with 4,4‘-Bipyridine

2003 ◽  
Vol 42 (25) ◽  
pp. 8294-8299 ◽  
Author(s):  
Chih-Chieh Wang ◽  
Cheng-Han Yang ◽  
Shih-Min Tseng ◽  
Gene-Hsiang Lee ◽  
Yung-Ping Chiang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Mixed Ligand ◽  
Metal Coordination ◽  
Polymeric Network

The Dynamics, energetics and selectivity of water chain-containing aquapores created by the self-assembly of aquafoldamer molecules

2015 ◽  
Vol 13 (43) ◽  
pp. 10613-10619 ◽  
Author(s):  
Wenliang Ma ◽  
Chunquan Wang ◽  
Juntong Li ◽  
Kun Zhang ◽  
Yu-Jing Lu ◽  
...  
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Water Molecules ◽  
Water Chain ◽  
Self Assembled

Self-assembled hollow tubular aquapores were found to be stable, very dynamic yet highly selective toward recognition of water molecules.

scholarly journals How to Make a Better Magnet? Insertion of Additional Bridging Ligands into a Magnetic Coordination Polymer

2018 ◽  
Vol 4 (3) ◽  
pp. 41
Author(s):  
Gabriela Handzlik ◽  
Dawid Pinkowicz
Keyword(s):  
Coordination Polymer ◽  
Self Assembly ◽  
Magnetic Hysteresis ◽  
Three Dimensional ◽  
Magnetic Ordering ◽  
Magnetic Interaction ◽  
Magnetic Hysteresis Loop ◽  
Water Molecules ◽  
Crystallization Water ◽  
Bridging Ligands

A three-dimensional cyanide-bridged coordination polymer based on FeII (S = 2) and NbIV (S = 1/2) {[FeII(H2O)2]2[NbIV(CN)8]·4H2O}n (Fe2Nb) was modified at the self-assembly stage by inserting an additional formate HCOO− bridge into its cyanide framework. The resulting mixed-bridged {(NH4)[(H2O)FeII-(μ-HCOO)-FeII(H2O)][NbIV(CN)8]·3H2O}n (Fe2NbHCOO) exhibited additional FeII-HCOO-FeII structural motifs connecting each of the two FeII centers. The insertion of HCOO− was possible due to the substitution of some of the aqua ligands and crystallization water molecules in the parent framework by formate anions and ammonium cations. The formate molecular bridge not only shortened the distance between FeII ions in Fe2NbHCOO from 6.609 Å to 6.141 Å, but also created additional magnetic interaction pathways between the magnetic centers, resulting in an increase in the long range magnetic ordering temperature from 43 K for Fe2Nb to 58 K. The mixed-bridged Fe2NbHCOO also showed a much broader magnetic hysteresis loop of 0.102 T, compared to 0.013 T for Fe2Nb.

Poly[di-μ-aqua-μ-1,2-bis(pyridin-4-yl)ethene-κ2N:N′-tetrakis(4-iodobenzoato-κ2O,O′)dicadmium]

2011 ◽  
Vol 68 (1) ◽  
pp. m21-m23 ◽  
Author(s):  
Dong Liu ◽  
Ni-Ya Li
Keyword(s):  
Self Assembly ◽  
Title Compound ◽  
The Self ◽  
Dimensional Structure ◽  
Water Molecules ◽  
Two Dimensional ◽  
Coordination Environment ◽  
Iodobenzoic Acid

Colourless crystals of the title compound, [Cd2(C7H4IO2)4(C12H10N2)(H2O)2]n, were obtained by the self-assembly of Cd(NO3)2·4H2O, 1,2-bis(pyridin-4-yl)ethene (bpe) and 4-iodobenzoic acid (4-IBA). Each CdIIatom is seven-coordinated in a pentagonal–bipyramidal coordination environment by four carboxylate O atoms from two different 4-IBA ligands, two O atoms from two water molecules and one N atom from a bpe ligand. The CdIIcentres are bridged by the aqua molecules and bpe ligands, which lie across centres of inversion, to give a two-dimensional net. Topologically, taking the CdIIatoms as nodes and the μ-aqua and μ-bpe ligands as linkers, the two-dimensional structure can be simplified as a (6,3) network.

scholarly journals Organization of Bone Mineral: The Role of Mineral–Water Interactions

Geosciences ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 466 ◽  
Author(s):  
Stanislas Von Euw ◽  
Tsou-Hsi-Camille Chan-Chang ◽  
Caroline Paquis ◽  
Bernard Haye ◽  
Gérard Pehau-Arnaudet ◽  
...  
Keyword(s):  
Surface Layer ◽  
Bone Mineral ◽  
Self Assembly ◽  
Hydration Shell ◽  
Organic Matrix ◽  
Water Molecules ◽  
Recent Theory ◽  
Mineral Particles ◽  
Amorphous Surface ◽  
Mature Bone

The mechanism (s) that drive the organization of bone mineral throughout the bone extracellular matrix remain unclear. The long-standing theory implicates the organic matrix, namely specific non-collagenous proteins and/or collagen fibrils, while a recent theory proposes a self-assembly mechanism. Applying a combination of spectroscopic and microscopic techniques in wet and dry conditions to bone-like hydroxyapatite nanoparticles that were used as a proxy for bone mineral, we confirm that mature bone mineral particles have the capacity to self-assemble into organized structures. A large quantity of water is present at the surface of bone mineral due to the presence of a hydrophilic, amorphous surface layer that coats bone mineral nanoparticles. These water molecules must not only be strongly bound to the surface of bone mineral in the form of a rigid hydration shell, but they must also be trapped within the amorphous surface layer. Cohesive forces between these water molecules present at the mineral–mineral interface not only hold the mature bone mineral particles together, but also promote their oriented stacking. This intrinsic ability of mature bone mineral particles to organize themselves without recourse to the organic matrix forms the foundation for the development of the next generation of orthopedic biomaterials.

Analogy to a Chinese knot in an ion-pair copper(II)–neodymium(III) complex based on a hexadentate Schiff base condensation product of 5-bromosalicylaldehyde and glycylglycine

2013 ◽  
Vol 69 (4) ◽  
pp. 376-379
Author(s):  
Li-Qing Xu ◽  
Li-Ping Lu ◽  
Miao-Li Zhu
Keyword(s):  
Schiff Base ◽  
Self Assembly ◽  
Condensation Product ◽  
Ion Pair ◽  
Three Dimensions ◽  
Water Molecules ◽  
Solvent Water ◽  
Square Planar ◽  
Jahn Teller ◽  
Pentadentate Ligands

Self-assembly of CuCl2, NdCl3, 5-bromosalicylaldehyde and glycylglycine yields the ion-pair copper(II)–neodymium(III) complex, poly[[decaaquabis[μ3-2-({2-[(5-bromo-2-oxidobenzylidene)amino]acetyl}azanidyl)acetato]bis[μ2-2-({2-[(5-bromo-2-oxidobenzylidene)amino]acetyl}azanidyl)acetato]tetracopper(II)dineodymium(III)] bis{[2-({2-[(5-bromo-2-oxidobenzylidene)amino]acetyl}azanidyl)acetato]cuprate(II)} tetradecahydrate], {[Cu4Nd2(C11H8BrN2O4)4(H2O)10][Cu(C11H8BrN2O4)]2·14H2O}n. The anion is planar and mononuclear, showing an approximately square-planar coordination of the metal atom, while the cation is a hexanuclear centrosymmetric transition metal–lanthanide (Cu–Nd) heterometallic complex, with the independent copper cations in square-planar and square-pyramidal coordinations. The asymmetric unit comprises one half of this cation, one anion and seven solvent water molecules. The positions of the six metal centres in the cation reproduce a Chinese knot arrangement. The dipeptidic Schiff base releases three H atoms and can act as a tetradentate, a pentadentate or a hexadentate ligand. Longer interactions between the pentadentate ligands and the Jahn–Teller CuIIcation link the hexanuclear aggregates into cationic chains in the [010] direction in which 14- and 22-membered subloops occur. Extensive hydrogen bonding in three dimensions involves both the coordinated and the solvent water molecules.

Sign in / Sign up

Export Citation Format

Share Document