Poly[triaquabis­(μ2-3-carboxy­pyrazine-2-carboxyl­ato)dilithium(I)]

In the title compound, [Li2(C6H3N2O4)2(H2O)3]n, the coordination number for both independent Li+ cations is five. One of the Li+ ions has a distorted trigonal–bipyramidal geometry, coordinated by one of the carboxyl O atoms of a 3-carboxy­pyrazine-2-carboxyl­ate ligand, two O atoms from two water mol­ecules, and an N and a carboxyl­ate O atom of a second 3-carboxy­pyrazine-2-carboxyl­ate ligand. The other Li+ ion also has a distorted trigonal–bipyramidal geometry, coordinated by one water mol­ecule and two 3-carboxy­pyrazine-2-carboxyl­ate ligands through an N and a carboxyl­ate O atom from each. One of the carboxyl groups of the two ligands takes part in an intra­molecular O—H⋯O hydrogen bond. The stabilization of the crystal structure is further assisted by O—H⋯O, O—H⋯N and C—H⋯O hydrogen-bonding inter­actions involving the water mol­ecules and carboxyl­ate O atoms

1,4-Diferrocenylbutane-1,4-dione

In the crystal structure of the title compound, [Fe2(C5H5)2(C14H12O2)], each carbonyl group is coplanar with the adjacent cyclo­penta­dienyl ring, thus maximizing the π-orbital overlap and electronic inter­actions between the groups. In the crystal structure, there are inter- and intra­molecular C—H⋯O contacts

Poly[[diaqua­caesium(II)]bis­(μ3-3-carboxy­pyrazine-2-carboxyl­ato)]. Corrigendum

Corrigendum to Acta Cryst. (2007), E63, m1783–m1784

Effects of the 5E Teaching Model Using Interactive Simulation on Achievement and Attitude in Physics Education

In this study, the effects of 5E teaching model with interactive simulations on students’ academic achievements and attitudes were investigated and their opinions about using simulations in physics teaching were also determined. Two 11th grade science stream classes with 80 students participated in the research and a quasi-experimental design with pre- and post-test control groups was used. While a traditional method was used to teach the control group, the 5E teaching model with interactive simulations was used to teach the experimental group by the same teacher. The quantitative data were collected by using an achievement test and attitude scale and the qualitative data were collected via semi-structured interview form. For the analysis of the quantitative data, independent samples t-tests were used and for qualitative data, content analysis was conducted. The findings revealed that interactive simulations integrated 5E teaching model caused significantly better acquisition of scientific concepts related to content taught and relatively higher positive attitudes towards physics than traditionally based instruction. The results have also been supported by the thoughts collected from the students in the experimental group at the end of the study. As a result the 5E teaching model integrated with simulations had potential to help eleventh graders improve their physics academic achievement and attitude

Dimethyl­ammonium bis­(3-oxidonaphthalene-2-carboxyl­ato)borate hemihydrate

The title compound, C2H8N+·C22H12BO6 −·0.5H2O, was synthesized under atmospheric conditions in the presence of dimethyl­formamide acting as a template. The structure is composed of [NH2(CH3)2]+ cations, bis­(3-oxidonaphthalene-2-carboxyl­ato)borate anions and water mol­ecules. The water molecule lies on a twofold rotation axis. The stabilization of the crystal structure comes from electrostatic inter­actions and is assisted by inter­molecular O—H⋯O and N—H⋯O hydrogen bonds between the layers

Lazer ışınının N,N- Bis (5-kloro-2-hidroksi bezofenon)-1,3 propandiamin kristal yapısı üzerindeki etkilerinin incelenmesi

YÖK Tez ID: 105852ÖZET Yüksek Lisans Tezi Lazer Işınının N,N'-Bis (5-Kloro-2-Hidroksibenzofenon)-l,3-Propandiamin Kristal Yapısı Üzerindeki Etkilerinin İncelenmesi Kutalmış GÜVEN Kırıkkale Üniversitesi Fen Bilimleri Enstitüsü Fizik Anabilim Dalı Danışman: Prof. Dr. Tahsin Nuri DURLU Bu tez çalışmasında, lazer ışınının N,N'-Bis (5-Kloro-2-Hidroksibenzofenon)-l,3- Propandiamin kristal yapısı üzerindeki etkilerini incelemek için üç ayrı ölçüm yapılmıştır. LÖIçümde normal şartlar altında, hiçbir dış etki olmadan, II. Ölçümde, kristale 23cm uzaklıktan, 632.8nm dalgaboylu He-Ne lazer ışını uygulanmış ve ELI: Ölçümde tekrar normal şartlar altında x-ışmları şiddet verileri toplanmıştır. Her üç ölçüm sonrası elde edilen x-ışınları şiddet verileri kullanılarak, direk yöntemleri içeren SHELX-97 bilgisayar programı ile, kristal yapı ayrı ayrı çözümlenmiş ve atomsal parametreler ile ısısal parametreler en küçük kareler yöntemi kullanılarak arıtılmıştır. Kristal yapının çözümlenmesi ile, her üç ölçüm için; bağ uzunlukları, bağ açıları ve ısısal titreşim parametreleri bulunmuştur. Düzlem hesapları yapılarak molekülün düzlemsel olup olmadığı ve birbirleriyle yaptıkları dihedral açılar bulunmuştur. Elde edilen bu parametreler, tek kristale lazer ışını uygulama öncesi ve sonrasında karşılaştırılmıştır. 2001, 142 Sayfa ANAHTAR KELİMELER: Lazer Işınımı, Tek Kristal, Direk Yöntemler, En-Küçük Kareler YöntemleriABSTRACT Master's Thesis EFFECTS OF LASER RADIATION ON THE STRUCTURE (N,N-Bis (5-ChIoro-2-Hydroxybenzophenone)-l,3-Propanediamine) CRYSTAL Kutalmış GÜVEN Kırıkkale University Graduate School of Natural and Applied Sciences Department of Physics Supervisor: Tahsin Nuri DURLU In order to investigate the effects of laser radiation on the structure of (N,N -Bis (5- Chloro-2-Hydroxybenzophenone)-l,3-Propanediamine) crystal, three different measurements were made. In the first measurement, x-ray diffraction peaks were collected under normal laboratory conditions, without any external treatment. In the second measurement, the He-Ne laser radiation with the 632.8 nm wavelength was applied onto the crystal from the distance of 23cm, during the collection of data. And finally, in the third measurement, again, x-ray diffraction peaks were collected under normal conditions, without any external treatment. By using the x-ray diffraction peaks for each measurement, the crystal structure was solved separately employing the computer program SHELX-97 that includes direct methods. The atomic and thermal parameters were refined by using least square method. After solving the structure of the crystal, the bond distances, bond angles and thermal parameters were calculated for each measurement. The planar calculations were made to understand whether the molecule is planar or not and the dihedral angles between these selected planes were calculated. These calculated parameters were compared prior and after the laser radiation applied onto the crystal. 2001, 142 pages KEY WORDS: LASER Radiation, Single Crystal, Direct Methods, Least-square methods

Synthesis of new single crystals resulted from reactions of some boron compounds with alcohols and organic acids, investigation of these by using x ray diffractometer and analysis of their structures

YÖK Tez ID: 196778ÖZETBAZI BOR BİLEŞİKLERİNİN ALKOLLER VE ORGANİK ASİTLER İLEREAKSİYONLARI SONUCU YENİ TEK KRİSTALLERİN SENTEZİ,BU KRİSTALLERİN X-IŞINLARI DİFRAKTOMETRESİNDE İNCELENMESİ VEYAPILARININ ANALİZİGÜVEN, KutalmışKırıkkale ÜniversitesiFen Bilimleri EnstitüsüFizik Anabilim Dalı, Doktora TeziDanışman : Prof. Dr. Tahsin Nuri DurluTemmuz 2005, 203 sayfaBu tez çalışmasında, bor içerikli yeni tek kristaller sentezlenmekamacıyla sodyum borhidrür (NaBH4) ve borik asitin (B(OH)3) bazı alkoller veorganik asitlerle reaksiyonları yapılmıştır. Bu reaksiyonların sonucunda eldeedilen tek kristal özelliğine sahip kristaller, tek kristal difraktometresindensağlanan x-ışınları kırınım şiddet verileri yardımı ile incelenmiştir. Bu şiddetverilerinin toplanması işlemleri detaylı olarak açıklanmıştır.Sentezlenmiş olan bor içerikli orijinal tek kristallerin yapıları doğrudanyöntemleri içeren SHELXS-97 ve SHELXL-97 bilgisayar programları kullanılarakayrı ayrı çözümlenmiştir. Bu yapılara ait atomsal ve ısısal parametreler enküçük kareler yöntemi kullanılarak arıtılmıştır.Her bir kristal için ; bağ uzunlukları, bağ açıları ve ısısal titreşimparametreleri hesaplanmıştır. Her bir örnek kristal için, bu kristali oluşturançeşitli atomlardan belirlenmiş düzlemler arası dihedral açılar bulunmuştur.Düzlem hesaplamaları sonrası, bu kristalleri oluşturan moleküllerin düzlemselolup olmadığı incelenmiştir. Her bir kristal için hesaplanan ve elde edilen bağuzunlukları ve açıları, dihedral açı değerleri ve düzlemselliği uluslararasıliteratürde bulunan benzer yapılardaki değerlerle karşılaştırılmış ve elde edilensonuçların uyum içerisinde olduğu gözlemlenmiştir.Anahtar Kelimeler : Bor, Borik Asit, Sodyum Borhidrür, Boratlar, Tek KristalYapı Analizi, X-Işınları Veri Toplama.ABSTRACTSYNTHESIS OF NEW SINGLE CRYSTALSRESULTED FROM REACTIONS OF SOME BORON COMPOUNDSWITH ALCOHOLS AND ORGANIC ACIDS,INVESTIGATION OF THESE CRYSTALS BY USINGX-RAY DIFFRACTOMETERAND ANALYSIS OF THEIR STRUCTURESGÜVEN, KutalmışKırıkkale UniversityGraduate School Of Natural and Applied SciencesDepartment of Physics, Ph. D. ThesisSupervisor : Prof. Dr. Tahsin Nuri DurluJuly 2005, 203 pagesIn order to synthesize new single crystals having boron compounds, thereactions of sodium borohydrate (NaBH4) and boric acid (B(OH)3) with somealcohols and organic acids have been carried out. Crystallographically suitablesingle crystals resulted from these reactions have been investigated with theaid of X-ray diffraction intensities. The collecting processes of these dataintensities have also been examined in detail.The structures of synthesized original single crystals having boroncompounds have been solved by using computer programs SHELXS-97 andSHELXL-97 including direct methods. Atomic and thermal parameters of thesestructures have been refined by using Least-Square method.For each crystal; the bond lengths, angles and thermal vibrationparameters have been calculated. After performing plane calculations, it hasbeen investigated whether the molecules in each crystal are planar. In additionto this, dihedral angles between the previously defined planes from atoms andmolecules have been obtained.For each crystal structure, calculated and obtained values of bondlengths, bond angles, dihedral angles and plane geometries have beencompared to the values of the similar structures in the literature and it hasbeen confirmed that these values are compatible and in a good agreement withthe literature.Key Words: Boron, Boric Acid, Sodium Borohydrate, Borates, Single CrystalStructure Analysis, X-Ray Data Collection

Lazer Işınının N,N'-Bis ( 5-Kloro-2-Hidroksibenzofenon )-1,3-Propandiamin Kristal Yapısı Üzerindeki Etkilerinin İncelenmesi

Tez (Yüksek Lisans) -- Kırıkkale Üniversitesi47896

Bazı bor bileşiklerinin alkoller ve organik asitler ile reaksiyonları sonucu yeni tek kristallerin sentezi, bu kristallerin X-ışınları difraktometresinde incelenmesi ve yapılarının analizi

Tez (Doktora) -- Kırıkkale Üniversitesi78651

Pentacarbonyl(2,6-diaminopyridine)chromium(0): synthesis and molecular structure

Photolysis of hexacarbonylchromium(0) in the presence of 2,6-diaminopyridine in toluene solution at 10 degreesC yields pentacarbonyl(2,6-diaminopyridine)chromium(0), which could be isolated from solution as plate-like crystals and fully characterized by using the single crystal X-ray diffractometry and MS, IR, H-1 and C-13 NMR spectroscopy. The complex was found to have the 2,6-diaminopyridine ligand bonded to the chromium atom through one of the NH2 groups. A single crystal X-ray structure of the complex reveals that the coordination sphere around the chromium atom is a slightly distorted octahedron, involving five carbonyls and one 2,6-diaminopyridine ligand. Because of the steric requirement of 2,6-diaminopyridine the four equatorial carbonyl groups are bended away from the N-donor ligand. The pyridine plane makes an angle of 112.9(3)degrees with the OC-Cr-N bond axis. The Cr-C distances have values between 1.833(7) and 1.935(7) Angstrom. The Cr-N distance is 2.236(5) Angstrom