1
|
Hohl T, Kremer RK, Ebbinghaus SG, Khan SA, Minár J, Hoch C. Influence of Disorder on the Bad Metal Behavior in Polar Amalgams. Inorg Chem 2023; 62:3965-3975. [PMID: 36821862 DOI: 10.1021/acs.inorgchem.2c04430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
The two new ternary amalgams K1-xRbxHg11 [x = 0.472(7)] and Cs3-xCaxHg20 [x = 0.20(3)] represent two different examples of how to create ternary compounds from binaries by statistical atom substitution. K1-xRbxHg11 is a Vegard-type mixed crystal of the isostructural binaries KHg11 and RbHg11 [cubic, BaHg11 structure type, space group Pm3̅m, a = 9.69143(3) Å, Rietveld refinement], whereas Cs3-xCaxHg20 is a substitution variant of the Rb3Hg20 structure type [cubic, space group Pm3̅n, a = 10.89553(14) Å, Rietveld refinement] for which a fully substituted isostructural binary Ca phase is unknown. In K1-xRbxHg11, the valence electron concentration (VEC) is not changed by the substitution, whereas in Cs3-xCaxHg20, the VEC increases with the Ca content. Amalgams of electropositive metals form polar metal bonds and show "bad metal" properties. By thermal analysis, magnetic susceptibility and resistivity measurements, and density functional theory calculations of the electronic structures, we investigate the effect of the structural disorder introduced by creating mixed-atom occupation on the physical properties of the two new polar amalgam systems.
Collapse
Affiliation(s)
- Timotheus Hohl
- Department Chemie, Ludwig-Maximilians-Universität München, 81377 München, Germany
| | - Reinhard K Kremer
- Max-Planck-Institut für Festkörperforschung Stuttgart, 70569 Stuttgart, Germany
| | - Stefan G Ebbinghaus
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, 06108 Halle (Saale), Germany
| | - Saleem A Khan
- New Technologies Research Center, University of West Bohemia, 30100 Pilsen, Czech Republic
| | - Ján Minár
- New Technologies Research Center, University of West Bohemia, 30100 Pilsen, Czech Republic
| | - Constantin Hoch
- Department Chemie, Ludwig-Maximilians-Universität München, 81377 München, Germany
| |
Collapse
|
2
|
Hohl T, Hoch C, Wendorff M, Röhr C. The Hg-rich part of the binary system K–Hg revised: synthesis and crystal and electronic structure of the new mercurides KHg 4, KHg 5 and KHg 8. Acta Cryst Sect A 2022. [DOI: 10.1107/s2053273322092336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
|
3
|
Nusser L, Hohl T, Tambornino F, Hoch C. Front Cover: The Cesium Oxide Mercuride Cs
18
Hg
8
O
6
(Z. Anorg. Allg. Chem. 10/2022). Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lukas Nusser
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstr. 5–13, Haus D 81377 München Germany
| | - Timotheus Hohl
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstr. 5–13, Haus D 81377 München Germany
| | - Frank Tambornino
- Fachbereich Chemie Phillips-Universität Marburg und Wissenschaftliches Zentrum für Materialwissenschaften (MZMW) Hans-Meerwein-Straße 4 35032 Marburg Germany
| | - Constantin Hoch
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstr. 5–13, Haus D 81377 München Germany
| |
Collapse
|
4
|
Nusser L, Hohl T, Tambornino F, Hoch C. The Cesium Oxide Mercuride Cs18Hg8O6. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202100389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lukas Nusser
- Department Chemie, Ludwig-Maximilians-Universität München Department Chemie Butenandtstraße 5-13 (D) D-81377 München GERMANY
| | - Timotheus Hohl
- Department Chemie, Ludwig-Maximilians-Universität München GERMANY
| | | | - Constantin Hoch
- LMU: Ludwig-Maximilians-Universitat Munchen Department Chemie Butenandtstraße 5 - 13 (D) D-81377 München GERMANY
| |
Collapse
|
5
|
Rendenbach B, Hohl T, Harm S, Hoch C, Johrendt D. Electrochemical Synthesis and Crystal Structure of the Organic Ion Intercalated Superconductor (TMA) 0.5Fe 2Se 2 with Tc = 43 K. J Am Chem Soc 2021; 143:3043-3048. [PMID: 33595300 DOI: 10.1021/jacs.0c13396] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Intercalation of organic cations in superconducting iron selenide can significantly increase the critical temperature (Tc). We present an electrochemical method using β-FeSe crystals (Tc ≈ 8 K) floating on a mercury cathode to intercalate tetramethylammonium ions (TMA+) quantitatively to obtain bulk samples of (TMA)0.5Fe2Se2 with Tc = 43 K. The layered crystal structure is closely related to the ThCr2Si2-type with disordered TMA+ ions between the FeSe layers. Although the organic ions are not detectable by X-ray diffraction, packing requirements as well as first-principle density functional theory calculations constrain the specified structure. Our synthetic route enables electrochemical intercalations of other organic cations with high yields to greatly optimize the superconducting properties and to expand this class of high-Tc materials.
Collapse
Affiliation(s)
- Bettina Rendenbach
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (D), 81377 München, Germany
| | - Timotheus Hohl
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (D), 81377 München, Germany
| | - Sascha Harm
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (D), 81377 München, Germany
| | - Constantin Hoch
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (D), 81377 München, Germany
| | - Dirk Johrendt
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (D), 81377 München, Germany
| |
Collapse
|
6
|
Abstract
Abstract
Four solvent complexes of beryllium iodide were prepared by dissolving BeI2 in N,N-dimethyl formamide (DMF), pyridine (Pyr), N-methyl pyrrolidone (NMP) and 2,6-dimethyl pyridine (2,6-lutidine, Lut). Their crystal structures were established from single crystal X-ray diffraction. For [Be(DMF)4]I2 a new modification is reported (monoclinic, space group P21/c, a = 12.491(2), b = 11.593(2), c = 15.310(3) Å, β = 94.7073(6)°). In [Be(Pyr)4]I2 (monoclinic, space group C2/c, a = 17.8799(13), b = 7.6174(5), c = 18.2611(14) Å, β = 113.508(4)°) and [Be(NMP)4]I2 (orthorhombic, space group Pbca, a = 13.941(5), b = 15.754(3), c = 24.634(7) Å) homoleptic tetrahedral complex cations are formed, while the sterically demanding solvent ligand Lut yields a neutral complex with covalently bound iodine ligands [BeI2(Lut)2] (monoclinic, space group P21/c, a = 7.8492(9), b = 24.265(3), c = 27.037(3) Å, β = 97.076(3)°). Their electrochemical stability with respect to their application as beryllium electrolytes for deposition of beryllium from solution is discussed.
Collapse
Affiliation(s)
- Timotheus Hohl
- Department Chemie , Ludwig-Maximilians Universität München , Butenandtstr. 5-13 (D), D-81377 München , Germany
| | - Torben Sinn
- Department Chemie , Ludwig-Maximilians Universität München , Butenandtstr. 5-13 (D), D-81377 München , Germany
| | - Constantin Hoch
- Department Chemie , Ludwig-Maximilians Universität München , Butenandtstr. 5-13 (D), D-81377 München , Germany , Fax (+49) 89 2180 77440
| |
Collapse
|
7
|
Abstract
We have isolated the cDNA for Rab3D, an additional member of the small molecular weight GTP-binding protein family. Rab3D message is abundant in mouse adipocytes. It is increased during differentiation of 3T3-L1 cells into adipocytes, temporally coincident with the appearance of the insulin-sensitive glucose transporter GLUT4. Rab3D is a close homolog of Rab3A, which is found on the cytoplasmic surface of neurosecretory vesicles and which may be involved in their regulated secretion. Since our previous work showed that in permeabilized adipocytes nonhydrolizable GTP analogs mimic insulin in triggering exocytosis of GLUT4-containing vesicles, Rab3D may be involved in the insulin-induced exocytosis of GLUT4-containing vesicles in adipocytes.
Collapse
Affiliation(s)
- G Baldini
- Whitehead Institute for Biomedical Research, Nine Cambridge Center, MA 02142
| | | | | | | |
Collapse
|
8
|
Kiyak HA, McNeill RW, West RA, Hohl T, Heaton PJ. Personality characteristics as predictors and sequelae of surgical and conventional orthodontics. Am J Orthod 1986; 89:383-92. [PMID: 3458370 DOI: 10.1016/0002-9416(86)90069-2] [Citation(s) in RCA: 63] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The aims of this study were to determine the effects of surgical and conventional orthodontics on patients' body image and self-esteem and the association between personality characteristics and postoperative reports of pain, paresthesia, swelling, and satisfaction among 90 patients who underwent surgical orthodontics. Patients who underwent surgery completed questionnaires before their operations and up to 6 months after surgery. Self-esteem and body image were compared longitudinally between these patients and 33 persons who were undergoing orthodontic treatment only and 33 persons who had decided against treatment. Results suggest that patients' self-esteem, body image, and degree of extroversion are unrelated to postsurgical satisfaction and discomfort. Neuroticism was correlated with satisfaction, so that patients who scored in the higher range on a scale of neuroticism were less satisfied immediately after surgery and at removal of fixation wires. Neurotic patients also were more likely to complain of pain and swelling 6 months after surgery. Surgical patients held a more negative facial image and were more introverted than those in the other two groups but were similar in other personality traits before surgery. Both surgical and orthodontic patients improved significantly in body image over time, with the greatest increase among the former. Similar shifts in self-esteem occurred for the three groups, suggesting that surgery per se may not be the major determinant of longitudinal changes in self-esteem. Notably, the positive effect of surgery and orthodontic treatment on body image is an important motive for many persons seeking treatment. Results of this study provide important insights into how to prepare and counsel patients undergoing orthodontic treatment with and without surgery.
Collapse
|
9
|
Abstract
This report describes the final, two-year follow up in a longitudinal study of 74 patients who underwent orthognathic surgery for developmental deformities. Data for all six measurement periods were available for 46 patients. Complaints of functional problems decreased significantly from before surgery to 24 months after, although 49% of the patients continued to report lip paresthesia. The incidence of postsurgical problems had no effect on the satisfaction expressed with surgical outcomes, which remained high throughout the postoperative course. Self-esteem appeared to rise in anticipation of surgery, only to decline significantly at nine months after surgery, to rise again by 24 months (but not as high as before surgery). In some components, self-esteem remained significantly lower after surgery than before. Body image also showed a decline at nine months, although overall body image and profile image 20-26 months after surgery were significantly more positive than before surgery. These results point to the importance of continued contact with orthognathic surgery patients by surgeons and orthodontists for at least two years after surgery, particular attention being paid to the intermediate stages (six to 12 months) after surgery. This period of psychologic upheaval appears to be related to the patient's desire to complete postsurgical orthodontics.
Collapse
|
10
|
Abstract
The present study examined changes in recreational and social activities after orthognathic surgery. Because this is often an expectation of patients seeking surgery, it was hypothesized that activity levels would increase gradually after surgery, particularly for patients who become more extroverted and for unmarried patients. Information on the frequencies of recreational and social activities, and the persons with whom these activities were performed, were obtained from 53 patients in a self-administered questionnaire administered at least 2 days before surgery and again 3 weeks, 4 months, and 9 months after surgery. In addition, patients were assessed on introversion-extroversion before and after surgery. The results indicated that (1) for both married and single patients, recreational and social activities dropped immediately after surgery and gradually increased to a level similar to that prior to surgery at nine months after surgery; (2) contrary to expectations, the single patients over age 15 did not increase their recreational and social activities with friends of the opposite sex after surgery; and (3) the degree of change in introversion-extroversion after surgery was not associated with the degree of change in recreational and social activities performed with others. Implications for postsurgical adjustment of orthognathic patients and recommendations for future research are discussed.
Collapse
|
11
|
Abstract
In an attempt to determine the impact of surgical orthodontics on patients' personality and perceptions of oral function, fifty-five patients were examined longitudinally. Patients completed five questionnaires during the course of treatment, from 1 month before to 9 months after surgery. Orthodontic appliances were still being worn by 56.1 percent at the 9-month assessment. Satisfaction with surgery, self-esteem, and body image were high throughout the postsurgical stage but showed significant changes. Satisfaction peaked at 4 months but declined at 9 months postsurgery, as did self-esteem and facial body image. Most of this decline was attributable to patients being still under orthodontic treatment, but those with continuing problems of pain, paresthesia, and oral dysfunction were not more likely to report psychological dissatisfaction. Results are examined from the perspectives of integration of body image and patient expectations from orthognathic surgery.
Collapse
|
12
|
Abstract
A longitudinal study was conducted of the psychologic characteristics of 74 persons undergoing orthognathic surgery. The effects of neuroticism, locus of control, and expectations upon postsurgical outcomes were examined. The majority of patients scored in the normal range of most personality variables. The findings suggest a generally intact ego and accurate self-concept among orthognathic surgery patients. Expectations of pain and parasthesia were the best predictors of postsurgical outcomes, while neuroticism and locus of control scores predicted some outcomes in the early postoperative stages. The results indicate the importance of preparing orthognathic surgery patients against unrealistic expectations before surgery is undertaken, and of counseling certain patients during the early postoperative period.
Collapse
|
13
|
Kiyak HA, Hohl T, Sherrick P, West RA, McNeill RW, Bucher F. Sex differences in motives for and outcomes of orthognathic surgery. J Oral Surg 1981; 39:757-64. [PMID: 6944454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
|