A series of boron-containing conjugated microporous polymers with hierarchical porous structures have been readily prepared via typical transition metal-catalyzed coupling reactions. The distribution of micro- and mesopores in the networks as well as the specific surface areas are tunable via tailoring the structures of the building blocks. The distinct capability of the resulting Lewis acid-based neutral porous polymers to selectively capture fluoride ions provides a high-efficiency conversion into stable anionic porous polymers. For the first time, fluoride anion binding to boron atoms in a solid sample was essentially characterized by solid-state 11B MAS NMR spectroscopy, clearly revealing such an efficient conversion from a neutral network to a negatively charged one only through Lewis acid–base adduct formation. Upon a simple ion-exchange process, various heavy metal cations were facile to be loaded into the networks of the anionic porous polymers. Furthermore, the cobalt(II)-loaded porous polymers were shown to promote the stoichiometric homocoupling reactions of the different aryl Grignard regents, and exert distinct size selectivities for the homocoupling products, highly dependent on their porous structures. Such a successful loading strategy might be used for design and synthesis of new types of zeolite-like porous polymers with desirable catalytic properties for a certain organic transformation, as well as other functional materials.

The exploitation of colloidal building blocks with morphological and functional anisotropy facilitates the generation of complex structures with unique properties, which are not exhibited by isotropic particle assemblies. Herein, we demonstrate an easy and scalable bottom-up approach for the programmed assembly of hairy oppositely charged homogeneously decorated and Janus particles based on electrostatic interactions mediated by polyelectrolytes grafted onto their surface. Two different assembly routes are proposed depending on the target structures: raspberry-like/half-raspberry-like or dumbbell-like micro-clusters. Ultimately, stable symmetric and asymmetric microstructures could be obtained in a well-controlled manner for the homogeneous–homogeneous and homogeneous–Janus particle assemblies, respectively. The spatially separated functionalities of the asymmetric Janus particle-based micro-clusters allow their further assembly into complex hierarchical constructs, which may potentially lead to the design of materials with tailored plasmonics and optical properties.

Two new mesoporous metal–organic frameworks (DUT-75 and DUT-76) with exceptional ethene uptake were obtained using carbazole dicarboxylate based metal–organic polyhedra as supermolecular building blocks. The compounds have a total pore volume of 1.84 and 3.25 cm³ gˉ¹ and a specific BET surface area of 4081 and 6344 m² gˉ¹, respectively, and high gas uptake at room temperature and high pressure.

No description available.

A series of boron-containing conjugated microporous polymers with hierarchical porous structures have been readily prepared via typical transition metal-catalyzed coupling reactions. The distribution of micro- and mesopores in the networks as well as the specific surface areas are tunable via tailoring the structures of the building blocks. The distinct capability of the resulting Lewis acid-based neutral porous polymers to selectively capture fluoride ions provides a high-efficiency conversion into stable anionic porous polymers. For the first time, fluoride anion binding to boron atoms in a solid sample was essentially characterized by solid-state 11B MAS NMR spectroscopy, clearly revealing such an efficient conversion from a neutral network to a negatively charged one only through Lewis acid–base adduct formation. Upon a simple ion-exchange process, various heavy metal cations were facile to be loaded into the networks of the anionic porous polymers. Furthermore, the cobalt(II)-loaded porous polymers were shown to promote the stoichiometric homocoupling reactions of the different aryl Grignard regents, and exert distinct size selectivities for the homocoupling products, highly dependent on their porous structures. Such a successful loading strategy might be used for design and synthesis of new types of zeolite-like porous polymers with desirable catalytic properties for a certain organic transformation, as well as other functional materials.

Das vorliegende Instrument – der Fragebogen zur Identifikation von Wissensbarrieren (WiBa) – misst den Umgang mit Wissen und Wissensbarrieren in Organisationen. Es lehnt sich in seiner Struktur an die Bausteine des Wissensmanagements von Probst, Raub und Romhardt (1997, 2006) an, die eine Art Lebenslauf von Wissen abbilden. Die 14 Skalen des Fragebogens decken die Themenfelder transaktives Wissen, Informationsverlust, interne Wissensbeschaffung, externe Wissensbeschaffung, Bedeutung von Wissensmanagement, Informationsspeicherung, Betriebsblindheit und mangelnde Aufmerksamkeit, mangelhafte Darstellung und Missverständnisse, Misstrauen und Mikropolitik, Übergabeprozesse, Informationsfluss, Kommunikationsklima, Lernkultur sowie Verbesserungsbedarf ab. Neben geschlossenen Fragen (Ratingskala, siebenstufig) gibt es auch einige offene Fragen. Der WiBa-Fragebogen sieht sich als Beitrag zur so genannten dritten Generation des Wissensmanagements. Auf Grund der Entwicklung unserer Gesellschaft von einer Produktions- zu einer Wissensgesellschaft gilt Wissen als die zentrale Ressource eines Unternehmens, die in der Regel noch nicht optimal ausgeschöpft wird. Zur Verbesserung werden oft gängige Wissensmanagement-Standardmaßnahmen blind ergriffen, die die vorhandenen Schwächen nicht im Kern treffen und daher auch ihre Wirkung nicht entfalten. Stattdessen ist die Entwicklung passgenauer, auf die aktuellen Bedürfnisse des Unternehmens abgestimmter Maßnahmen notwendig. Der WiBa-Fragebogen ermöglicht die dafür erforderliche Bestimmung des Ist-Zustandes im Umgang mit Wissen, indem er ein Stärken- und Schwächenprofil ausgibt. Er schließt damit eine Lücke in der bisherigen Landschaft der Diagnostik-Instrumente. Neben den Ergebnissen von explorativen Experten-Interviews flossen auch Erkenntnisse aus der Forschungsliteratur und ausgewählte Fragen aus anderen Instrumenten in die Item-Generierung ein. Im Rahmen von drei Erhebungswellen wurden insgesamt 1.256 Mitarbeiter mit dem WiBa-Fragebogen befragt. Das nun vorliegende Instrument ist objektiv, reliabel und valide. Insbesondere eine umfangreiche Prüfung der Kriteriums- und Konstruktvalidität konnte durch die Hinzunahme von anderen Erhebungsinstrumenten (zu den Themenfeldern Arbeitszufriedenheit, Arbeitsbeschreibung, Organisationskultur und Vorgesetztenverhalten) und durch Prüfung von Zusammenhängen mit demografischen Variablen und Unternehmensmerkmalen erreicht werden. Die stichprobenstarken Erhebungen führten dazu, dass ein erster Grundstock an Benchmark-Werte vorliegt. / The Questionnaire for the Identification of Knowledge Barriers (WiBa) measures the handling of knowledge within companies and organizations. The WiBa-questionnaire’s structure is inspired by the knowledge cycle of Probst, Raub and Romhardt (1997, 2006) which describes a lifecycle of knowledge. The fourteen scales include the topics: transactive knowledge, loss of information, internal knowledge acquisition, external knowledge acquisition, meaning of knowledge management, storage of information, professional blindness and lack of awareness, poor description and misunderstanding, mistrust and micropolitics, handover processes, information flow, climate of communication, learning culture and need for improvement. The questionnaire primarily includes questions rated on a seven point scale but also a small number of open questions. The WiBa-questionnaire is part of the so called third generation of knowledge management: Because our society has changed from a production-based to a knowledge-based society, knowledge is one of the most important resources for companies. Yet it is frequently not used as effectively as it could be. In trying to alleviate this, companies often blindly implement standard actions that do not exactly match the companies’ needs and therefore do not work. Instead it is crucial to implement actions that precisely fit the weaknesses and particularities of the company. In order to do that, an analysis of the actual handling of knowledge in the company is needed – this can be done by the WiBa-questionnaire. The output of this questionnaire consists of a profile of knowledge-strengths and knowledge-weaknesses. The questionnaire thereby closes a gap among in the currently available diagnostic tools. There were three sources for the development of items: first, explorative expert interviews, second, results from research and third, other questionnaires. In the sequence of three surveys a total of 1.256 employees took part. The WiBa-questionnaire is objective, reliable and valid. Especially criteria-validity and construct-validity were proven by checking the interrelations with other questionnaires (work satisfaction, work description, organizational culture and behavior of the superior) and with demographic variables and attributes of the company. Because of the large number of participants in the surveys, there is a basis of benchmark data available.