TY  - JOUR
A1  - Mondal, Suvendu Sekhar
A1  - Kreuzer, Alex
A1  - Behrens, Karsten
A1  - Schütz, Gisela
A1  - Holdt, Hans-Jürgen
A1  - Hirscher, Michael
T1  - Systematic experimental study on quantum sieving of hydrogen isotopes in metal-amide-imidazolate frameworks with narrow 1-D channels
JF  - ChemPhysChem : a European journal of chemical physics and physical chemistry
N2  - Quantum sieving of hydrogen isotopes is experimentally studied in isostructural hexagonal metal-organic frameworks having 1-D channels, named IFP-1, -3, -4 and -7. Inside the channels, different molecules or atoms restrict the channel diameter periodically with apertures larger (4.2 angstrom for IFP-1, 3.1 angstrom for IFP-3) and smaller (2.1 angstrom for IFP-7, 1.7 angstrom for IFP-4) than the kinetic diameter of hydrogen isotopes. From a geometrical point of view, no gas should penetrate into IFP-7 and IFP-4, but due to the thermally induced flexibility, so-called gate-opening effect of the apertures, penetration becomes possible with increasing temperature. Thermal desorption spectroscopy (TDS) measurements with pure H-2 or D-2 have been applied to study isotope adsorption. Further TDS experiments after exposure to an equimolar H-2/D-2 mixture allow to determine directly the selectivity of isotope separation by quantum sieving. IFP-7 shows a very low selectivity not higher than S=2. The selectivity of the materials with the smallest pore aperture IFP-4 has a constant value of S approximate to 2 for different exposure times and pressures, which can be explained by the 1-D channel structure. Due to the relatively small cavities between the apertures of IFP-4 and IFP-7, molecules in the channels cannot pass each other, which leads to a single-file filling. Therefore, no time dependence is observed, since the quantum sieving effect occurs only at the outermost pore aperture, resulting in a low separation selectivity.
KW  - gas adsorption
KW  - hydrogen isotopes
KW  - isotope separation
KW  - metal-organic frameworks
KW  - quantum sieving
Y1  - 2019
U6  - https://doi.org/10.1002/cphc.201900183
SN  - 1439-4235
SN  - 1439-7641
VL  - 20
IS  - 10
SP  - 1311
EP  - 1315
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - BOOK
A1  - Behrens, Michael
T1  - Turnaround Finance : eine Analyse der Kapitalzufuhr im Krisenfall des Mittelstandes
T3  - Schriftenreihe Finanzierung und Banken
Y1  - 2008
SN  - 978-3-89673-467-9
VL  - 13
PB  - Verl. Wissenschaft & Praxis
CY  - Sternenfels
ER  - 
TY  - JOUR
A1  - Grimm, Rosina
A1  - Behrens, T.
A1  - Märker, Michael
A1  - Elsenbeer, Helmut
T1  - Soil organic carbon concentrations and stocks on Barro Colorado Island : digital soil mapping using random forests analysis
Y1  - 2008
UR  - http://si-pddr.si.edu/jspui/bitstream/10088/8584/1/ Grimm_et_al_Soil_organic_carbon_concentrations_and_stocks_on_B.pdf
U6  - https://doi.org/10.1016/j.geoderma.2008.05.008
SN  - 0016-7061
ER  - 
TY  - GEN
A1  - Mondal, Suvendu Sekhar
A1  - Behrens, Karsten
A1  - Matthes, Philipp R.
A1  - Schönfeld, Fabian
A1  - Nitsch, Jörn
A1  - Steffen, Andreas
A1  - Primus, Philipp-Alexander
A1  - Kumke, Michael Uwe
A1  - Müller-Buschbaum, Klaus
A1  - Holdt, Hans-Jürgen
T1  - White light emission of IFP-1 by in situ co-doping of the MOF pore system with Eu3+ and Tb3+
N2  - Co-doping of the MOF 3∞[Zn(2-methylimidazolate-4-amide-5-imidate)] (IFP-1 = Imidazolate Framework Potsdam-1) with luminescent Eu3+ and Tb3+ ions presents an approach to utilize the porosity of the MOF for the intercalation of luminescence centers and for tuning of the chromaticity to the emission of white light of the quality of a three color emitter. Organic based fluorescence processes of the MOF backbone as well as metal based luminescence of the dopants are combined to one homogenous single source emitter while retaining the MOF's porosity. The lanthanide ions Eu3+ and Tb3+ were doped in situ into IFP-1 upon formation of the MOF by intercalation into the micropores of the growing framework without a structure directing effect. Furthermore, the color point is temperature sensitive, so that a cold white light with a higher blue content is observed at 77 K and a warmer white light at room temperature (RT) due to the reduction of the organic emission at higher temperatures. The study further illustrates the dependence of the amount of luminescent ions on porosity and sorption properties of the MOF and proves the intercalation of luminescence centers into the pore system by low-temperature site selective photoluminescence spectroscopy, SEM and EDX. It also covers an investigation of the border of homogenous uptake within the MOF pores and the formation of secondary phases of lanthanide formates on the surface of the MOF. Crossing the border from a homogenous co-doping to a two-phase composite system can be beneficially used to adjust the character and warmth of the white light. This study also describes two-color emitters of the formula Ln@IFP-1a–d (Ln: Eu, Tb) by doping with just one lanthanide Eu3+ or Tb3+.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 190 
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-79953
SP  - 4623
EP  - 4631
ER  - 
TY  - JOUR
A1  - Mondal, Suvendu Sekhar
A1  - Behrens, Karsten
A1  - Matthes, Philipp R.
A1  - Schönfeld, Fabian
A1  - Nitsch, Jörn
A1  - Steffen, Andreas
A1  - Primus, Philipp-Alexander
A1  - Kumke, Michael Uwe
A1  - Müller-Buschbaum, Klaus
A1  - Holdt, Hans-Jürgen
T1  - White light emission of IFP-1 by in situ co-doping of the MOF pore system with Eu3+ and Tb3+
JF  - Journal of materials chemistry : C, Materials for optical and electronic devices
N2  - Co-doping of the MOF 3∞[Zn(2-methylimidazolate-4-amide-5-imidate)] (IFP-1 = Imidazolate Framework Potsdam-1) with luminescent Eu3+ and Tb3+ ions presents an approach to utilize the porosity of the MOF for the intercalation of luminescence centers and for tuning of the chromaticity to the emission of white light of the quality of a three color emitter. Organic based fluorescence processes of the MOF backbone as well as metal based luminescence of the dopants are combined to one homogenous single source emitter while retaining the MOF's porosity. The lanthanide ions Eu3+ and Tb3+ were doped in situ into IFP-1 upon formation of the MOF by intercalation into the micropores of the growing framework without a structure directing effect. Furthermore, the color point is temperature sensitive, so that a cold white light with a higher blue content is observed at 77 K and a warmer white light at room temperature (RT) due to the reduction of the organic emission at higher temperatures. The study further illustrates the dependence of the amount of luminescent ions on porosity and sorption properties of the MOF and proves the intercalation of luminescence centers into the pore system by low-temperature site selective photoluminescence spectroscopy, SEM and EDX. It also covers an investigation of the border of homogenous uptake within the MOF pores and the formation of secondary phases of lanthanide formates on the surface of the MOF. Crossing the border from a homogenous co-doping to a two-phase composite system can be beneficially used to adjust the character and warmth of the white light. This study also describes two-color emitters of the formula Ln@IFP-1a–d (Ln: Eu, Tb) by doping with just one lanthanide Eu3+ or Tb3+.
Y1  - 2015
U6  - https://doi.org/10.1039/C4TC02919D
SN  - 2050-7534
SN  - 2050-7526
VL  - 18
IS  - 3
SP  - 4623
EP  - 4631
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Mondal, Suvendu Sekhar
A1  - Behrens, Karsten
A1  - Matthes, Philipp R.
A1  - Schönfeld, Fabian
A1  - Nitsch, Jörn
A1  - Steffen, Andreas
A1  - Primus, Philipp-Alexander
A1  - Kumke, Michael Uwe
A1  - Müller-Buschbaum, Klaus
A1  - Holdt, Hans-Jürgen
T1  - White light emission of IFP-1 by in situ co-doping of the MOF pore system with Eu3+ and Tb3+
JF  - Journal of materials chemistry : C, Materials for optical and electronic devices
Y1  - 2015
U6  - https://doi.org/10.1039/c4tc02919d
SN  - 2050-7526
SN  - 2050-7534
VL  - 3
IS  - 18
SP  - 4623
EP  - 4631
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Alrefai, Anas
A1  - Mondal, Suvendu Sekhar
A1  - Wruck, Alexander
A1  - Kelling, Alexandra
A1  - Schilde, Uwe
A1  - Brandt, Philipp
A1  - Janiak, Christoph
A1  - Schoenfeld, Sophie
A1  - Weber, Birgit
A1  - Rybakowski, Lawrence
A1  - Herrman, Carmen
A1  - Brennenstuhl, Katlen
A1  - Eidner, Sascha
A1  - Kumke, Michael Uwe
A1  - Behrens, Karsten
A1  - Günter, Christina
A1  - Müller, Holger
A1  - Holdt, Hans-Jürgen
T1  - Hydrogen-bonded supramolecular metal-imidazolate frameworks: gas sorption, magnetic and UV/Vis spectroscopic properties
JF  - Journal of Inclusion Phenomena and Macrocyclic Chemistry
N2  - By varying reaction parameters for the syntheses of the hydrogen-bonded metal-imidazolate frameworks (HIF) HIF-1 and HIF-2 (featuring 14 Zn and 14 Co atoms, respectively) to increase their yields and crystallinity, we found that HIF-1 is generated in two different frameworks, named as HIF-1a and HIF-1b. HIF-1b is isostructural to HIF-2. We determined the gas sorption and magnetic properties of HIF-2. In comparison to HIF-1a (Brunauer-Emmett-Teller (BET) surface area of 471m(2) g(-1)), HIF-2 possesses overall very low gas sorption uptake capacities [BET(CO2) surface area=85m(2) g(-1)]. Variable temperature magnetic susceptibility measurement of HIF-2 showed antiferromagnetic exchange interactions between the cobalt(II) high-spin centres at lower temperature. Theoretical analysis by density functional theory confirmed this finding. The UV/Vis-reflection spectra of HIF-1 (mixture of HIF-1a and b), HIF-2 and HIF-3 (with 14 Cd atoms) were measured and showed a characteristic absorption band centered at 340nm, which was indicative for differences in the imidazolate framework.
KW  - Gas-sorption
KW  - Ligand design
KW  - Magnetic properties
KW  - Supramolecular chemistry
KW  - Solvothermal synthesis
Y1  - 2019
U6  - https://doi.org/10.1007/s10847-019-00926-6
SN  - 1388-3127
SN  - 1573-1111
VL  - 94
IS  - 3-4
SP  - 155
EP  - 165
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - JOUR
A1  - Nienaber, André
A1  - Heinz, Andreas
A1  - Rapp, Michael A.
A1  - Bermpohl, F.
A1  - Schulz, M.
A1  - Behrens, J.
A1  - Löhr, M.
T1  - Einfluss der Personalbesetzung auf Konflikte auf psychiatrischen Stationen
T1  - Influence of staffing levels on conflicts in inpatient psychiatric care
JF  - Der Nervenarzt : Organ der Deutschen Gesellschaft für Psychiatrie, Psychotherapie und Nervenheilkunde ; Mitteilungsblatt der Deutschen Gesellschaft für Neurologie
N2  - Psychiatrische Stationen sind ein wichtiges Element in der psychiatrischen Versorgung von Menschen mit akuter Eigen- oder Fremdgefährdung. Leider kommt es in diesem Rahmen immer wieder auch zu Aggression, Gewalt (Konflikten) sowie zur Anwendung von Zwang (Eindämmung). Als entscheidender Faktor für den sachgemäßen Umgang mit diesen Situationen wird sowohl die Quantität als auch die Qualität der Mitarbeitenden angesehen. Vor diesem Hintergrund beschäftigt sich die vorliegende Untersuchung mit der Versorgungssituation auf akutpsychiatrischen Stationen. Die Hypothese lautet, dass sowohl die Größe der akutpsychiatrischen Station als auch die Anzahl der Pflegenden einen Einfluss auf das Vorkommen konflikthafter Situationen haben. Hierfür sind Daten in 6 Kliniken auf insgesamt 12 psychiatrischen Stationen erfasst worden. Als Erfassungsinstrument diente die Patient Staff Conflict Checklist – Shift Report (PCC-SR). Insgesamt konnten 2026 Schichten (Früh‑, Spät- und Nachtschicht) erfasst und ausgewertet werden. Die personelle Besetzung der Stationen mit Pflegepersonal variierte erheblich. Die Ergebnisse zeigen, dass sowohl die Stationsgröße als auch die Anzahl der Pflegepersonen auf akutpsychiatrischen Stationen einen signifikanten Einfluss auf das Vorkommen von Konflikten haben. In den Ergebnissen zeigt sich weiterhin, dass sich die Inzidenz des konflikthaften Verhaltens von Patienten sowohl im Hinblick auf die untersuchten Stationen der beteiligten Krankenhäuser als auch im Hinblick auf die betrachteten Dienstzeittypen unterscheiden. Darüber hinaus zeigt sich, dass das Ausmaß der Schließung einer Akutstation und die Größe einer Station einen negativen Einfluss auf die Inzidenz von Konflikten im stationär akutpsychiatrischen Kontext haben. Das Auftreten konflikthaften Verhaltens kann zur Fremd- oder Selbstgefährdung und zu einer Vielzahl deeskalierender und eindämmender Maßnahmen führen. Hierfür sind entsprechende personelle Ressourcen erforderlich.
N2  - Acute psychiatric wards are an important element in the mental healthcare of people at risk for acute harm to others or self-harm. Unfortunately, aggression, violence (conflict) and the use of coercion (containment) are still part of psychiatric care. The decisive factor for the correct handling of these situations is the quantity as well as the quality of the employees. Therefore, the present study dealt with the care situation on acute psychiatric wards. The hypothesis is that both the number of beds on the acute psychiatric ward and the number of caregivers have an impact on the occurrence of conflict and containment. For this purpose, data were collected in 6 clinics on a total of 12 acute psychiatric wards. The Patient Staff Conflict Checklist - Shift Report (PCC-SR) was used as the data entry tool. A total of 2026 shifts (early, late and night shifts) were recorded and evaluated. The staffing of the wards with nursing personnel varied considerably. The results show that both the size of the ward and also the number of caregivers on acute psychiatric wards have a significant impact on the occurrence of conflicts. The results also show that the incidence of conflicting behavior of patients differs both in terms of the wards of the hospitals involved and in the type of service considered. In addition, it can be seen that the extent of closure of an acute ward (i.aEuro<overline>e. the closed ward or entrance door) and the size of a ward (i.aEuro<overline>e. the number of beds) have a negative impact on the incidence of inpatient acute psychiatric contexts. The occurrence of conflict behavior can lead to alien or self-endangerment and to a variety of de-escalating and containment measures. This requires appropriate human resources.
KW  - Inpatient psychiatric care
KW  - Danger to others
KW  - Coercion
KW  - Ward size
KW  - Personnel resources
Y1  - 2018
U6  - https://doi.org/10.1007/s00115-018-0521-5
SN  - 0028-2804
SN  - 1433-0407
VL  - 89
IS  - 7
SP  - 821
EP  - 827
PB  - Springer
CY  - New York
ER  -