Curved crystal morphology, photoreactivity and photosalient behaviour of mononuclear Zn(II) complexes

Mulijanto, Caroline Evania; Quah, Hong Sheng; Tan, Geok Kheng; Donnadieu, Bruno; Vittal, Jagadese J.

doi:10.1107/s2052252516019072

Cited by 41 publications

(43 citation statements)

References 61 publications

(55 reference statements)

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“…[12] Macrocyclic conjugated organic dimers of 9,10-bis(2-thienylethynyl)anthracene can also grow bent single crystals as ar esult of phase impurities. [14] Furthermore,s everal organic single crystals such as hexachlorobenzene,h exabromobenzene,a nd 1,3,5-trichlorobenzene,a mong others,c an be deformed by applying mechanical force. [14] Furthermore,s everal organic single crystals such as hexachlorobenzene,h exabromobenzene,a nd 1,3,5-trichlorobenzene,a mong others,c an be deformed by applying mechanical force.…”

Section: Straight and Bent Crystalsmentioning

confidence: 99%

Is a Bent Crystal Still a Single Crystal?

2019

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The mention of the word “crystal” invokes images of minerals, gems, and rocks, all of which are inevitably solid, hard, and durable entities with well‐defined smooth faces and straight edges. With the discovery in the first half of the 20th century that many molecular crystals are soft and can be deformed in a similar way as rubber or plastic, this perception is changing, and both the concept and formal definition of what a crystal is may require reinterpretation. The seemingly naïve question posed in the title of this Minireview does not have a simple answer. Here, we discuss how the effects of the elastic and plastic deformation of molecular crystals on the diffraction signature give primary evidence of their degree of crystallinity. In most cases, the definition of a crystal holds for both elastically and plastically deformed crystals and, unless there is significant or complete physical separation of the crystal during the deformation, they can safely be considered (deformed) single crystals with a high concentration of defects.

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Section: Straight and Bent Crystalsmentioning

confidence: 99%

Is a Bent Crystal Still a Single Crystal?

2019

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“…Diese Kristalle werden häufig bei hochpräzisen rçntgenspektroskopischen Wellenlängenmessungen und zur Plasmadiagnostik eingesetzt. [14] Darüber hinaus kçnnen mehrere orga- nische Einkristalle wie Hexachlorbenzol, Hexabrombenzol und 1,3,5-Trichlorbenzol unter anderem durch Anwendung mechanischer Kräfte verformt werden. [11] Mineralien wie Jamesonit (Pb 4 FeSb 6 S 14 ), Orepiment (As 2 S 3 ), Spiralapatit (Ca 5 (PO 4 ) 3 F), Schnecken aus Molybdänit (MoS 2 ), Millerit (NiS), Korund (Al 2 O 3 ), Fluorit (CaF 2 )und Augit ((Ca,Na)(Mg,Fe,Al)[(Si,Al) 2 O 6 ]) sind auch dafürb ekannt, gebogene Kristalle zu bilden.…”

Section: Gerade Und Gebogene Kristalleunclassified

“…[13] Gebogene Kristalle kçnnen auch aus Metallkoordinationsverbindungen gewonnen werden;g ebogene Einkristalle des Zn II -Komplexes von 3-Fluor-4-styrylpyridin kçnnen aus Dimethylformamid/Tetrahydrofuran oder Acetonitril-Lçsungen gezüchtet werden. [14] Darüber hinaus kçnnen mehrere orga- nische Einkristalle wie Hexachlorbenzol, Hexabrombenzol und 1,3,5-Trichlorbenzol unter anderem durch Anwendung mechanischer Kräfte verformt werden. [15] Photoinduziertes Drehen, Biegen und Wçlben von Einkristallen wurde ausführlich untersucht.…”

Section: Gerade Und Gebogene Kristalleunclassified

Ist ein gebogener Kristall immer noch ein Einkristall?

Commins¹,

Karothu²,

Naumov

2019

Angewandte Chemie

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Die Erwähnung des Wortes “Kristall” ruft beim Betrachter Bilder von Mineralien, Edelsteinen und Gesteinen hervor, die alle unvermeidlich solide, harte und langlebige Objekte mit klar definierten glatten Flächen und geraden Kanten sind. Mit der Entdeckung in der ersten Hälfte des 20. Jahrhunderts, dass viele molekulare Kristalle weich sind und ähnlich wie Gummi oder Kunststoff verformt werden können, entwickelte sich die Auffassung, dass das, was einst als Kristall galt, heute einer neuen formalen Definition bedarf. Die scheinbar naive Frage im Titel dieses Aufsatzes hat keine einfache Antwort. Wir diskutieren die Auswirkungen der elastischen und plastischen Verformung von Molekülkristallen auf die Beugungssignatur als primären Nachweis für den Grad ihrer Kristallinität. In den meisten Fällen gilt die allgemein akzeptierte Definition eines Kristalls auch für elastisch und plastisch verformte Kristalle. Sofern keine signifikante oder vollständige physikalische Trennung des Kristalls während der Verformung vorliegt, können sie sicher als (verformte) Einkristalle mit hoher Fehlerdichte betrachtet werden.

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“…Several discrete metal complexes while undergoing [2+ +2] cycloaddition reactionunder UV light, have also been accompanied by PS effects. [30][31][32] Of these paddlewheel-based metal complexes are easier target to get deeper insights into these properties. Here we investigated the influence of the manganese(II)i ons on the photoreactivity and PS behavior.…”

Section: Introductionmentioning

confidence: 99%

Solid‐State Photochemical [2+2] Cycloaddition Reaction of Mn^II Complexes

Yadava

Vittal

2019

Chemistry A European J

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Three Mn II complexes have been synthesized under similare xperimental conditions. Of these [Mn 2 (benzoate) 4 (L) 2 ]( whereL = 4-styrylpyridine or 4spy, 1 and 2-fluoro-4'-styrylpyridineo r2 F-4spy, 3)a re paddlewheel complexes, but crystallized in different space groups.W hereas [Mn 2 (benzoate) 4 (3F-4spy) 4 ]( 3F-4spy = 3-fluoro-4'-styrylpyridine), 4 is ad inuclearc omplex having different stoichiometry from 1 and 3 with two pairs of 3F-4spy ligandsalignedi n face-to-face manner.A ni rreversible phase transition occurs from the space group P2 1 /c to C2/c when 1 was heated up to 125 8Ct o2 in as ingle-crystal-to-single-crystal fashion or when ground 1 to powder. 2 is isomorphousa nd isostruc-tural to 3.C omplimentary p-p interactions in head-to-tail alignment of the styrylpyridine ligands furnishes 1D aggregates in 1-3 which are congenial to undergo [2+ +2] cycloaddition reaction under UV light. Whereas, face-to-facea lignment of the 4spy pairs in 4 is expected to provide ah eadto-head photoproduct. All theM n II complexes are indeed found to be photoreactive.T oo ur surprise, contrary to their Zn II analogues, 2 and 3 were not found to be photosalient. The percentage volumee xpansiond uring the photoreaction as determined from the density measurements, was found to be too low (3.2 and4 .6 %r espectively for 2 and 3)t o have this behavior.1 HNMR spectroscopy has also confirmed the ratios between the ligands in these complexes.

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Curved crystal morphology, photoreactivity and photosalient behaviour of mononuclear Zn(II) complexes

Abstract: Solid-state [2 + 2] photocycloaddition reactivity, mechanical motion during cycloaddition reaction under UV light and naturally curved single crystals are reported in structurally similar mononuclear Zn(II) coordination complexes containing fluoro derivatives of 4-styryl pyridine ligands.

Cited by 41 publications

References 61 publications

Is a Bent Crystal Still a Single Crystal?

Is a Bent Crystal Still a Single Crystal?

Ist ein gebogener Kristall immer noch ein Einkristall?

Solid‐State Photochemical [2+2] Cycloaddition Reaction of Mn^II Complexes

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Curved crystal morphology, photoreactivity and photosalient behaviour of mononuclear Zn(II) complexes

Abstract: Solid-state [2 + 2] photocycloaddition reactivity, mechanical motion during cycloaddition reaction under UV light and naturally curved single crystals are reported in structurally similar mononuclear Zn(II) coordination complexes containing fluoro derivatives of 4-styryl pyridine ligands.

Cited by 41 publications

References 61 publications

Is a Bent Crystal Still a Single Crystal?

Is a Bent Crystal Still a Single Crystal?

Ist ein gebogener Kristall immer noch ein Einkristall?

Solid‐State Photochemical [2+2] Cycloaddition Reaction of MnII Complexes

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Product

Resources

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Solid‐State Photochemical [2+2] Cycloaddition Reaction of Mn^II Complexes