bluuebunny/crossref_metadata_2025_split huggingface dataset:
Miscibility and melting behavior of poly(ethylene terephthalate)/poly(trimethylene terephthalate) blends
Authors: Liang Hao , Xie Fang , Chen Biao , Guo Fuquan , Jin Zhen , Luo Fusheng 
Published: September 2007

AbstractThe miscibility and melting behavior of binary crystalline blends of poly(ethylene terephthalate) (PET)/poly(trimethylene terephthalate) (PTT) have been investigated with differential scanning calorimetry and scanning electron microscope. The blends exhibit a single composition‐dependent glass transition temperature (Tg) and the measured Tg fit well with the predicted Tg value by the Fox equation and Gordon‐Taylor equation. In addition to that, a single composition‐dependent cold crystallization temperature (Tcc) value can be observed and it decreases nearly linearly with the low Tg component, PTT, which can also be taken as a valid supportive evidence for miscibility. The SEM graphs showed complete homogeneity in the fractured surfaces of the quenched PET/PTT blends, which provided morphology evidence of a total miscibility of PET/PTT blend in amorphous state at all compositions. The polymer–polymer interaction parameter, χ12, calculated from equilibrium melting temperature depression of the PET component was −0.1634, revealing miscibility of PET/PTT blends in the melting state. The melting crystallization temperature (Tmc) of the blends decreased with an increase of the minor component and the 50/50 sample showed the lowest Tmc value, which is also related to its miscible nature in the melting state. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Interfacial conversion for poly(para‐phenylenevinylene) at a cholesteric liquid crystal surface
Authors: Goto Hiromasa , Miyazawa Tomohisa , Tomishige Keiichi , Kunimori Kimio , Kiebooms Rafaël H. L. , Akiyama Yuki , Akagi Kazuo 
Published: September 2007

AbstractA new approach for the preparation of poly (para‐phenylenevinylene) (PPV) with an ordered structure is presented. PPV is synthesized by a precursor method using a cholesteric liquid crystal medium. The resultant PPV film is observed to have a cholesteric fingerprint‐like texture, indicating replication of the cholesteric liquid crystal medium. Infrared absorption measurements confirm that the PPV has essentially the same molecular structure as normal PPV film. Ultraviolet–visible absorption measurements show that the absorption band due to π−π* transition of the conjugated main‐chain is located at 402 nm. The conversion is found to occur at the interface with the cholesteric liquid crystal medium as a mechanical process. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Influence of prolonging vulcanization on the structure and properties of hard rubber
Authors: Wang Ya , Wang Yiqing , Tian Ming , Zhang Liqun , Ma Jun 
Published: September 2007

AbstractThis research on vulcanization illuminates the structure–property relationship of hard rubber with prolonging vulcanization. At the early stage of curing, polysulfur reacts with styrene–butadiene rubber (SBR) macromolecules to form chemical crosslink, as evidenced by the significant increase of modulus during vulcanization. The chemical crosslink is followed by a large amount of interchain attraction, which is due to the modification of SBR macromolecules by combined sulfur. The combined sulfur is formed by the reaction of sulfur atom with SBR backbone, which improves the polarity of SBR macromolecules since sulfur is polar. The influences of chemical crosslink and interchain attraction on the mechanical properties, thermal properties, dynamic mechanical properties, and fracture morphology were analyzed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Characterization of the viscoelastic and mechanical properties of tightly cross‐linked polythiourethane networks
Authors: Droger Nicolas , Primel Odile , Halary Jean Louis 
Published: September 2007

AbstractBoth viscoelastic behavior and plastic deformation in compression were investigated on new polythiourethane networks based on diisocyanates and tri‐ or tetra‐thiols. Dynamic mechanical analysis was used to characterize the mechanically‐active α and β relaxations as a function of crosslink density and nature of the diisocyanate. Data molecular analysis on these novel materials led to conclusions in good agreement with earlier statements on the well‐known epoxy‐amine networks. Besides, consideration of the relaxational behavior, and especially in the β relaxation region, allowed one to interpret the plastic deformation properties of the systems under study and to predict their poor resistance to fracture. By the way, analysis of the energy required to yield permitted determination of a new characteristic temperature, Ty, which can be compared to the thermomechanical main transition temperature, Tα, and to the glass transition temperature, Tg. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Rapid replication of nanostructures made with a polymer using simple injection molding
Authors: Huang C. K. 
Published: September 2007

AbstractIt is possible to fabricate nanostructures of 25.5 nm by replication using injection molding. In this study, a silicon calibration grating was used as a mold insert to replicate high‐quality nanostructures with a simple custom‐made injection machine. The replicated grating with 25.5‐nm nanofeatures made with a polymer was of high quality when a high mold temperature was employed and the mold was evacuated. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Yttrium 90 ibritumomab tiuxetan (Zevalin®): A new bullet in the fight against malignant lymphoma?
Authors: Chapuy Bjoern , Hohloch Karin , Trümper Lorenz 
Published: September 2007

AbstractTargeted immunotherapy utilizing monoclonal antibodies has improved survival in both indolent and aggressive lymphoma significantly. Since malignant lymphomas are also responsive to radiation, the combination of targeted immunotherapy and radiation with radionuclide coupled to monoclonal antibodies is an attractive option to further improve treatment results. Zevalin is a commercially available variation of the murine anti‐CD20 antibody ibritumomab coupled to Yttrium 90 via the tiuxetan chelator. The development of this novel drug as well as the results of the pivotal studies and clinical strategies to implement this treatment into the routine practice of lymphoma oncology are presented in this review.
Effect of acyl‐CoA oxidase activity on the accumulation of γ‐decalactone by the yeast Yarrowia lipolytica: A factorial approach
Authors: García Erandi Escamilla , Nicaud Jean‐Marc , Belin Jean‐Marc , Waché Yves 
Published: September 2007

Abstractβ‐Oxidation is a cyclic pathway involved in the degradation of lipids. In yeast, it occurs in peroxisomes and the first step is catalyzed by an acyl‐CoA oxidase (Aoxp). The yeast Yarrowia lipolytica possesses several genes (POX) coding for Aoxps. This study is based on the factorial analysis of results obtained with the many POX derivative strains that have been constructed previously. The effect of interactions between Aoxps on the acyl‐CoA oxidase (Aox) activity was important even at the second order. We then investigated the effect of Aox activity on growth and lactone production. Aox activity was correlated with acidification of the medium by cells and with cellular growth but not with lactone production, although Aox activity on short chains was inversely correlated with lactone accumulation. Due to the poor correlation between Aox activity and lactone production, the modeling of this parameter gave no satisfactory results but growth depending on Aox activity was modeled.
Fabrication of lab‐on chip platforms by hot embossing and photo patterning
Authors: Maurya Devendra K. , Ng Wee Yang , Mahabadi Kambiz Ansari , Liang Yen Nan , Rodríguez Isabel 
Published: September 2007

AbstractIn this paper, we review the approaches developed in our laboratory to fabricate polymer‐based microfluidic devices to suit a range of applications in bio‐ or chemical analysis. Thermoplastic materials such as polycarbonate (PC) and poly(methyl methacrylate) (PMMA) are used to fabricate microfluidic devices via hot embossing. To emboss microchannels, we use hard stamps fabricated in silicon or soft stamps molded on poly(dimethylsiloxane) (PDMS). Hard stamps are fabricated on silicon wafers through photolithography and deep reactive ion etching (DRIE). Soft stamps are fabricated by casting PDMS prepolymer on silicon molds. To enclose the fluidic channels, direct fusion bonding was found to produce the highest bond strength with minimal structural deformation. One‐step photolithographic methods have also been explored to produce via photochemical patterning microfluidic structures in photocurable materials. We use the photocurable capabilities of a PDMS copolymer, which incorporates a methacrylate crosslinker. Microfluidic channels are produced via one step‐photopatterning processes by crosslinking the prepolymer mixture through a photomask. The smaller feature size attainable was 100 μm. Structures with higher spatial resolution are fabricated through a photoimprinting process whereby a mold is pressed against the precured mixture during UV crosslinking exposure. The application of the fabricated fluidic devices in electrophoretic ion analysis is also presented.
The future of biomanufacturing in Singapore
Authors: Wong Niki , Yap Miranda 
Published: September 2007

AbstractSingapore's vision is to become a global biomedical sciences (BMS) hub and to develop the BMS industry as the fourth manufacturing pillar of Singapore's economy. The biomanufacturing industry has been a significant growth area for Singapore's BMS industry, with four major biologics investments totaling close to US$1 billion being committed in less than 2 years and the setting up of local biomanufacturing companies. In parallel, resources in biomedical research and bioprocess manpower capabilities are being built up for this knowledge‐intensive industry. Located at the Biopolis, the epicenter of biomedical R&D, the Bioprocessing Technology Institute (BTI) has been developing bioprocess expertise and programs to support the manpower needs of the growing biomanufacturing sector. With a strong commitment to provide the biomanufacturing industry with research and manpower support, the future looks promising and Singapore is well positioned to become a leading biomanufacturing hub in Asia Pacific.
Defensins: Antimicrobial peptides for therapeutic development
Authors: Verma Chandra , Seebah Shalin , Low Soo Mei , Zhou Lei , Liu Shou Ping , Li Jing , Beuerman Roger W. 
Published: September 2007

AbstractA novel class of endogenous antimicrobial peptides called defensins has shown great versatility in their activity against a diverse range of microorganisms including bacteria, viruses and fungi. Their mode of action of bacterial cell lysis seems largely nonspecific and so promises to avert the development of resistance. These two features have made them an area of intense research activity and growing commercial interest. A successful multidisciplinary effort to investigate and develop novel defensins analogues has been established in Singapore that involves computer modeling, biochemistry, proteomics, chemical synthesis, molecular biology and clinical sciences.
Lithiumsalze des Tris(trimethylsilylamino)silans ‐ Zur Struktur in Lösung und im Festkörper
Authors: Kosse Peer , Popowski Eckhard , Veith Michael , Huch Volker 
Published: September 2007

Lithium Salts of Tris(trimethylsilylamino)silane ‐ Their Structures in Solution and in the Solid State*Amides, which result from the reaction of tris(trimethylsilylamino)silane (Me3SiNH)3SiH (1) with n‐butyllithium in the molar ratio 1:1 and 1:2 in nonpolar solvents, form a system in which the aminosilane 1, the monoamide (Me3SiNLi)(Me3SiNH)2SiH (2a), the diamide (Me3SiNLi)2(Me3SiNH)SiH (3), and the triamide (Me3SiNLi)3SiH (4) are in equilibrium. When the monoamide 2a is dissolved in THF only the dimeric monolithiated THF adduct 2b is obtained. An X‐ray structure analysis of the lithium silylamide 2b reveals that in the dimeric unit one of the lithium atoms is coordinated by THF, the two lithium atoms thus differing in coordination number (3 versus 4). An X‐ray study of the triamide 4 reveals a centrosymmetric polycycle. Multipole interactions are formed between the lithium and the nitrogen atoms. The reaction of the diamide 3 with chlorotrimethylsilane in boiling THF yields the cis isomer of the cyclic diamide [(Me3SiNLi)(Me3SiNH)SiN(SiMe3)]2· 2 THF (5) as a byproduct. According to an X‐ray structure analysis of 5 the lithium centers are coordinated by one oxygen and three nitrogen atoms, which form a strongly distorted tetrahedron. The interactions between lithium and nitrogen atoms N(1) and N(2), which are part of the four‐membered Si2N2 cycle, have to be considered as weak on the basis of the remarkably long Li‐N distances (233 and 243 pm).
Über dehydrierende Aufbaureaktionen zu silylsubstituierten Alkalimetallgermaniden, ‐stanniden und ‐phosphiden; Molekülstruktur von Neopentasilan
Authors: Lobreyer Thomas , Sundermeyer Wolfgang , Oberhammer Heinz 
Published: September 2007

Dehydrogenative Build‐up Reactions to Silyl‐Substituted Alkali Metal Germanides, Stannides, and Phosphides; Molecular Structure of NeopentasilaneThe build‐up reaction between monosilane and dispersed sodium or potassium in diethyleneglycol dimethyl ether leads to alkali metal silylsilanides of the composition (Na/K)‐SiH3‐n(SiH3)n (n = 0–3) (1, 1a‐c; 2, 2a‐c). By subsequent reactions with silyl nonafluorobutanesulfonate, C4F9SO3‐SiH3, benzenesulfonic acid, PhSO3H, and methyl p‐toluenesulfonate the corresponding silanes SiH4‐n(SiH3)n (n = 0–4) (3, 3a‐d) and methylsilanes CH3SiH3‐n (SiH3)n (n = 0–3) (4a‐d) were obtained in good yield. The molecular structure of neopentasilane (3d) has been determined by electron diffraction analysis. Treatment of group IV and V hydrides GeH4, PH3, and SnH4 with mixtures of sodium or potassium silylsilanides (1, 1a‐c; 2, 2a‐c) leads to silyl‐substituted sodium or potassium germanides (Na/K)GeH3‐n (SiH3)n (n = 1–3) (5a‐c, 6a‐c), phosphides KPH2‐n(SiH3)n (n = 1–2) (7a‐b), and stannides NaSnH3‐n(SiH3)n (n = 1–3) (8, 8a‐c).
Einfache Lithiumsalze des Tris(trimethylsilylamino)silans
Authors: Gregorzik Ralf , Hartmann Uwe , Vahrenkamp Heinrich 
Published: September 2007

Simple Zinc Complexes of Tris(imidazolylmethyl)amine LigandsThe three N‐R‐substituted tris(benzimidazolylmethyl)amine ligands L (1a: R = H, 1b: R = Me, 1c: R = Bz) were used to prepare trigonal‐bipyramidal zinc complexes with varying coligands on the open axial position. Starting with the appropriate zinc salts the complexes ·, and [L· Zn‐ONO2]+ were obtained with various counterions. In the aqua complexes of ligand 1a the water molecules could be replaced by·, acetate, and tosylate. The crystal structure determinations of· and· have revealed a coordination geometry of the L· ZnX cations which is intermediate between tetrahedral and trigonal‐bipyramidal.
Funktionelle Zinkkomplexe von Tris(imidazolylmethyl)amin‐Liganden
Authors: Hartmann Uwe , Gregorzik Ralf , Vahrenkamp Heinrich 
Published: September 2007

Functional Zinc Complexes of Tris(imidazolylmethyl)amine LigandsThe three N‐R‐substituted tris(benzimidazolylmethyl)amine ligands L (1a: R = H, 1b: R = Me, 1c: R = Bz) form zinc complexes with biologically active ligands on the fifth coordination site, starting from L, Zn(ClO4)2, and the coligand. The N‐protected amino acids glycine, histidine, and cysteine yield [L· Zn—OCO—CHR—NHAc]ClO4 (2a, 3a, 4a). Aspirin, salicylic acid, and orotic acid are incorporated as [L· Zn‐X]ClO4 (5a—c: X = O‐acetylsalicylate, 6a: X = salicylate, 7a—c: X = orotate). Similarly the sulfonamide furosemide is bound by its carboxylate function in [L· Zn‐Fur]ClO4 (8a—c). The aqua complex resulting from ligand 1a and Zn(ClO4)2 forms hydrogen bonds to nitriles and aldehydes, which has allowed the isolation of [L· Zn—OH2RCN](ClO4)2 (9a: RCN = MeCN, 10a: RCN = PrCN) and of [L· Zn—OH2RCHO](ClO4)2 (11a: RCHO = anisaldehyde, 12a: RCHO = p‐tolualdehyde). The structure determination of the salicylate complex 6a has confirmed the monodentate O‐coordination of the carboxylate substrates to zinc.
, der erste Germanium‐„Iniden”︁‐Komplex
Authors: Schiemenz Berthold , Huttner Gottfried 
Published: September 2007

Abstract\documentclass{article}\pagestyle{empty}\begin{document}$ \left[ {{\text{Cp'}}\left({{\text{CO}}} \right)_2 {\text{Mn}}\dddot - {\text{GeI}}\dddot - {\text{Mn}}\left( {{\text{CO}}} \right)_2 {\text{Cp'}}} \right]^ - $\end{document}, the First Germanium‐“Inidene” ComplexIm Gedenken an Herrn Dipl.‐Chem. Jochen Heuser.
GeI2 reacts with Na[{Cp′(CO)2Mn}2H] to form the inidenetype compound \documentclass{article}\pagestyle{empty}\begin{document}$ \left[ {{\text{Cp'}}\left( {{\text{CO}}} \right)_2 {\text{Mn}}\dddot - {\text{GeI}}\dddot - {\text{Mn}}\left( {{\text{CO}}} \right)_2 {\text{Cp'}}} \right]^ - $\end{document} (1). The anion 1 contains Ge(0) in a trigonal‐planar coordination, embedded between two Cp′(CO)2Mn groups and an iodo ligand. The intrinsic stability of the cumulene \documentclass{article}\pagestyle{empty}\begin{document}$ \left[ {{\text{Cp'}}\left( {{\text{CO}}} \right)_2 {\text{Mn}} = {\text{Ge}} = {\text{Mn}}\left( {{\text{CO}}} \right)_2 {\text{Cp'}}} \right] $\end{document} is still apparent in the structure of 1: The Ge—Mn bonds are short (229 pm) while the Ge—I distance is rather long (284 pm). The inidene‐type anion 1 can only be obtained from the above‐mentioned reaction if the reaction is quenched by addition of unpolar solvents, thus eliminating starting materials and coproducts. Direct workup of the reation mixture instead leads to [Cp′(CO)2MnGeI3]− (2) as the only isolated product. The transformation of 1 into 2, which contains Ge in the formal oxidation state +2, necessarily implies redox processes, which are well documented in inidene chemistry.
Synthese von C‐substituierten 2,5‐Dihydro‐1H‐borolen (3‐Borolenen)
Authors: Herberich Gerhard E. , Marx Hans‐W. , Wagner Trixie 
Published: September 2007

Synthesis of C‐substituted 2,5‐Dihydro‐1H‐boroles (3‐Borolenes)Magnesium‐diene addition compounds derived from isoprene, 2,3‐dimethylbutadiene, and 1,2‐dimethylenecyclohexane are treated with boron halides BCl2(NR2) (R = Me, Et, iPr), PhBCl2, or MeBBr2 to give C‐substituted 2,5‐dihydro‐1H‐boroles (3‐borolenes) 3–5. In a new in situ procedure 1,3‐pentadiene reacts with Mg/BCl2(NR2) in THF to yield 2‐methyl derivatives 2‐MeC4H5BNR2 (2). The NMe3 adduct of 4,5,6,7‐tetrahydro‐2‐methyl‐2‐boraindan 5e· NMe3 undergoes a topomerization with ΔG290 = 59· 2 kJ/mol in a dissociative‐associative process. The crystal structure of 3,4‐dimethyl‐1‐phenyl‐3‐borolene (4d) has been determined. The molecule displays a classical planar structure. There are no indications for specific intermolecular interactions.
Zink(II)‐Komplexe des Ammonium‐funktionalisierten 2,2′‐Bipyridins [6,6′‐{Me2N(H)CH2C≡C}2bpy](ClO4)2 und des verwandten Liganden 6,6′‐(CH3CH2CH2C≡C)2bpy
Authors: Kövári Endre , Krämer Roland 
Published: September 2007

Zinc(II) Complexes of the Ammonium‐Functionalized 2,2′‐Bipyridine [6,6′‐{Me2N(H)CH2C≡C}2bpy](ClO4)2 and of the Related Ligand 6,6′‐(CH3CH2CH2C≡C)2bpyThe 2,2‐bipyridine derivative 6,6′‐(Me2NCH2C≡C)2bpy (1b) was prepared by palladium‐catalyzed C‐C coupling reaction. Protonation of 1b with HX yielded the ammonium salts [6,6′‐{Me2N(H)CH2C≡C}2bpy]X2 (2a, X= NO3−; 2b, X = ClO4−). 2a was characterized by X‐ray crystallography. The complexes (1a)ZnCl2 (3) and [(H21b)ZnCl2](ClO4)2 (4) were obtained by reaction of 2b and the related ligand 6,6′‐(CH3CH2CH2C≡C)2bpy (1a) with ZnCl2. The crystal structure of 3 revealed a tetrahedral coordination of the metal ion by two bipyridine nitrogens and two chloride ligands. Stability constants in acetonitrile/water (19:1) of the 1:1 zinc complexes of 1a and 2a were determined spectrophotometrically. Complexes of [H21b]2+ are of potential interest as model systems for metal‐ammonium cooperativity in the active site of phosphodiesterase enzymes. In acetonitrile/water (19:1) the 1:1‐species [(H21b)Zn] promotes the hydrolysis of bis(p‐nitrophenyl) phosphate more efficiently than [(1a)Zn].
Ethyl‐substituierte 2,5‐Dihydro‐1,2,5‐oxadiborole
Authors: Köster Roland , Seidel Günter , Boese Roland 
Published: September 2007

Ethyl‐substituted 2,5‐Dihydro‐1,2,5‐oxadiboroles[1]Four N‐Lewis base‐(1,2,5‐oxadiboroles) rac‐5(Do) [Do = ammonia (NH3), quinuclidine (Q), pyridine (Py), γ‐picoline (γPic)] of·B(Et)OB(Et)C(Et)=C(Et) (5, identical with II) are prepared by reaction of cis‐Et2BC(Et)=C(Et)BEt2 (A) with KNH2 via the tetraethyl‐substituted (BNBC=C) heterocycles 1‐4.·B(Et)N(SiMe3)B(Et)C(Et)=C(Et) (4) reacts with water with elimination of Me3SiOH to give rac‐5(NH3). The latter undergoes exchange reactions with various N‐bases (Py, γPic, Q) quantitatively forming the 1:1 addition compounds rac‐5(Do) [Do = γPic (X‐ray structure analysis)]. rac‐5(NH3) reacts with Ph3B to yield H3N‐BPh3 and the unstable compound 5, which dimerises to (5)2 and/or reacts with (EtBO) elimination to afford the boroxin (EtBO)3 and, presumably, the nido‐carborane Et4C4B2Et2 (6). ‐ The potassium salt·K[B(Et2)OB(Et)C(Et) = C(Et)] (B) is transformed with ClPbMe3 to EtPbMe3 and presumably 5 or to the rearranged heterocycle·B(Et)OB(Et)C(Et2)C(Et, PbMe3) (7).
Reduktive Spaltung von (Ph2P)2NH und Stabilisierung der Spaltprodukte in einem monoradikalischen Dicobalt(1/2+)‐ und zwei Dicobalt(1+)carbonyl‐Komplexen; Kristallstrukturanalysen der drei neuen Komplexe
Authors: Pohl Diana , Ellermann Jochen , Knoch Falk A. , Moll Matthias , Bauer Walter 
Published: September 2007

Chemistry of Polyfunctional Molecules, 115[1]. ‐ Reductive Cleavage of (Ph2P)2NH and Stabilizing of the Cleavage Products in a Mono‐radicalic Dicobalt(1/2 + )‐ and Two Dicobalt(1 + ) Carbonyl Complexes; Crystal Structures of the Three New Complexes*[Co2(m̈‐CO)2(CO)4(m̈‐dppa)] [5; dppa = (Ph2P)2NH] reacts with dppa (1) in toluene at 85°C within 15 minutes primary to give [Co2(CO)4(m̈‐dppa)2] (6). After about one hour a reductive P‐N bond cleavage of the coordinated dppa in 6 takes place, accompanied by hydrogen transfer, yielding [(Co1+)2(m̈‐CO)(CO)4(dppa−)2] (7), the paramagnetic dinuclear complex [(Co1/2+)2(m̈‐PPh2−)(CO)2(m̈‐dppa)2] (8), and [(Co1+)2(m̈‐CO)(CO)3(m̈‐PPh2−)(m̈‐dppa−)PPh2NH2] (9). The three new compounds 7 ‐ 9 have been characterized by X‐ray analyses, 1H, 13C{1H}‐, 31P{1H}‐NMR, IR, ESR spectroscopy, and magnetic measurements.
Über die Kristallstrukturen der Monofluoroselenite MSeO2F (M = K, Rb, Cs)
Authors: Feldmann Claus , Jansen Martin 
Published: September 2007

On the Crystal Structures of the Monofluoroselenites MSeO2F (M = K, Rb, Cs)The alkali metal monofluoroselenites MSeO2F (M = K, Rb, Cs) have been prepared as single crystals. KSeO2F crystallizes in the space group P21/m and contains distorted trigonalpyramidal SeO2F− anions, the geometry of which has been determined for the first time. These complex anions are bridged by long‐range Se‐F interactions to linear chains. RbSeO2F and CsSeO2F crystallize in the space group Pm3m. In contrast to KSeO2F, the trigonal‐pyramidal SeO2F− anions in these latter two fluoroselenites are disordered. A phase transition between the ordered and disordered modification has been established in the case of KSeO2F. Vibrational spectra have been recorded and are correlated to the results of the crystal structure determination.