Synthesis and crystal structures of the nickel(II) complex with nitronyl nitroxide

Liu, G.; Chen, B.; Cheng, J. T.

doi:10.1134/s1070328412020066

Cited by 3 publications

(8 citation statements)

References 9 publications

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“…It should be noted that preceding studies in thin and ultrathin polymer films suggest that low T c values favour edge-on lamellae [2]. A transition from flat-on to edge-on lamellae with the decrease of crystallization temperature has even been identified for a 33 nm poly(bisphenol A hexane ether) film and a nanolayered poly(ethylene oxide) (PEO) system [2,17].…”

Section: Influence Of Crystallization Temperature On the Development mentioning

confidence: 99%

“…It is clear that as the thickness of the polymer film approaches the dimensions of the lamellar thickness, the appearance of flat-on lamellae should be favoured. According to the diversity of experimental observations, the transition from one orientation to the other seems to depend on the polymer material, the crystallization conditions and, in case of supported films, on the interaction of the material with the substrate [2]. In addition, it has also been reported that both orientations sometimes coexist [5,9].…”

Section: Introductionmentioning

confidence: 99%

“…Preferential lamellar orientation, slower kinetics of crystallization and lower levels of crystallinity are some of the morphological features commonly appearing with decreasing size of the polymer domains [2,3]. The underlying mechanisms are still a matter of controversy; in the case of thin films, the different substrateepolymer interaction is possibly the reason for the apparent disagreement among several investigations [2].…”

Section: Introductionmentioning

confidence: 99%

“…Edge-on and/or flat-on lamellae (the chain alignment is parallel or perpendicular to the layer plane respectively) arranged in a number of superstructures are usually observed [2]. As a general trend, decreasing the film thickness and increasing the crystallization temperature promote flat-on orientation and a number of mechanisms has been suggested [4,6e8].…”

Section: Introductionmentioning

confidence: 99%

“…Preferential lamellar orientation is usually detected in thin (below 1000 nm) and ultrathin (below 100 nm) polymer layers, either deposited on a substrate or as part of a free-standing multilayer assembly [2,4,5]. Edge-on and/or flat-on lamellae (the chain alignment is parallel or perpendicular to the layer plane respectively) arranged in a number of superstructures are usually observed [2].…”

Section: Introductionmentioning

confidence: 99%

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Confined crystallization of nanolayered poly(ethylene terephthalate) using X-ray diffraction methods

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et al. 2012

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a b s t r a c tThe development of crystalline lamellae in ultra-thin layers of poly(ethylene terephthalate) PET confined between polycarbonate (PC) layers in an alternating assembly is investigated as a function of layer thickness by means of X-ray diffraction methods. Isothermal crystallization from the glassy state is insitu followed by means of small-angle X-ray diffraction. It is found that the reduced size of the PET layers influences the lamellar nanostructure and induces a preferential lamellar orientation. Two lamellar populations, flat-on and edge-on, are found to coexist in a wide range of crystallization temperatures (T c ¼ 117e150 C) and within layer thicknesses down to 35 nm. Flat-on lamellae appear at a reduced crystallization rate with respect to bulk PET giving rise to crystals of similar dimensions separated by larger amorphous regions. In addition, a narrower distribution of lamellar orientations develops when the layer thickness is reduced or the crystallization temperature is raised. In case of edgeon lamellae, crystallization conditions also influence the development of lamellar orientation; however, the latter is little affected by the reduced size of the layers. Results suggest that flat-on lamellae arise as a consequence of spatial confinement and edge-on lamellae could be generated due to the interactions with the PC interface.

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Section: Influence Of Crystallization Temperature On the Development mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Confined crystallization of nanolayered poly(ethylene terephthalate) using X-ray diffraction methods

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Chemiluminescence‐driven photoelectrochemical sensor: A mini review

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Heterobimetallic Coordination Polymers Based on the [Pt(SCN)₄]^2– and [Pt(SeCN)₄]^2– Building Blocks

et al. 2013

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New complexes and the first coordination polymers containing [Pt(SCN)4](2-) of the type [M(L)x][Pt(SCN)4] (where L = 2,2'-bipyridine (bipy), x = 2, M = Co(II), Ni(II), Cu(II); L = ethylenediamine (en), x = 2, M = Ni(II), Cu(II); L = N,N,N',N'-tetramethylethylenediamine (tmeda), x = 1, M = Cu(II); L = 2,2';6',2″-terpyridine (terpy), x = 1, M = Mn(II), Co(II); L = 1,10-phenanthroline (phen), x = 2, M = Pb(II)) were prepared by reacting the appropriate metal-ligand cations with K2[Pt(SCN)4] and structurally characterized. [M(bipy)2Pt(SCN)4]2·2MeOH (M = Co (1), Cu (4)) consist of supramolecular tetranuclear distorted squares containing two [M(bipy)2](2+) and two [Pt(SCN)4](2+) units. [Cu(bipy)2(NCS)]2[Pt(SCN)4] (6) is a double salt of the [Pt(SCN)4](2-) anion and two [Cu(bipy)(NCS)](+) cations. [Cu(en)2Pt(SCN)4] (7, 8) are 1-D coordination polymers that are coordinated in either cis or trans fashion at the [Pt(SCN)4](2-) unit, for 7 and 8, respectively. Complexes [Cu(en)2Pt(SeCN)4] (9) and [Ni(en)2Pt(SCN)4] (10) are similar to 8 and 7, respectively, but complex 9 (prepared using ((n)Bu4N)2[Pt(SeCN)4]) also presents intermolecular Se-Se interactions which resulted in an increased dimensionality. Compounds [M(terpy)Pt(SCN)4] (M = Mn (11), Co (13)) involve 2-D sheets of [M(terpy)](2+) and [Pt(SCN)4](2-) units, whereas [Mn(terpy)2][Pt(SCN)4] (12) is a double salt of one [Mn(terpy)2](2+) unit and one [Pt(SCN)4](2-). [Cu(tmeda)Pt(SCN)4] (14) contains a five-coordinate Cu(2+) metal center coordinated to one tmeda ligand and three different [Pt(SCN)4](2-) units, resulting in 2-D sheets. [Pb(phen)2Pt(SCN)4] (15) contains an 8-coordinate Pb(2+) metal center coordinated to two phen ligands and four [Pt(SCN)4](2-), generating a 3-D network in the solid state. Structural correlations were established between the ancillary ligand, the choice of metal, the structure of the [Pt(SCN)4](2-) building block, and the resulting dimensionality of the coordination polymers.

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Synthesis and crystal structures of the nickel(II) complex with nitronyl nitroxide

Cited by 3 publications

References 9 publications

Confined crystallization of nanolayered poly(ethylene terephthalate) using X-ray diffraction methods

Confined crystallization of nanolayered poly(ethylene terephthalate) using X-ray diffraction methods

Chemiluminescence‐driven photoelectrochemical sensor: A mini review

Heterobimetallic Coordination Polymers Based on the [Pt(SCN)₄]^2– and [Pt(SeCN)₄]^2– Building Blocks

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Synthesis and crystal structures of the nickel(II) complex with nitronyl nitroxide

Cited by 3 publications

References 9 publications

Confined crystallization of nanolayered poly(ethylene terephthalate) using X-ray diffraction methods

Confined crystallization of nanolayered poly(ethylene terephthalate) using X-ray diffraction methods

Chemiluminescence‐driven photoelectrochemical sensor: A mini review

Heterobimetallic Coordination Polymers Based on the [Pt(SCN)4]2– and [Pt(SeCN)4]2– Building Blocks

Contact Info

Product

Resources

About

Heterobimetallic Coordination Polymers Based on the [Pt(SCN)₄]^2– and [Pt(SeCN)₄]^2– Building Blocks