The Experts below are selected from a list of 28530 Experts worldwide ranked by ideXlab platform
R V S S N Ravikumar - One of the best experts on this subject based on the ideXlab platform.
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physical and optical properties of co2 ni2 doped 20zno xli2o 30 x k2o 50b2o3 5 x 25 glasses observation of mixed alkali effect
Materials Research Bulletin, 2012Co-Authors: G Krishna N Kumari, Ch Rama Krishna, P S Rao, Sk Muntaz Begum, D V Sathish, P N Murthy, R V S S N RavikumarAbstract:Abstract Co 2+ and Ni 2+ ions doped 20ZnO + x Li 2 O + (30 − x ) K 2 O + 50B 2 O 3 (5 ≤ x ≤ 25) mol% glasses are prepared using melt quenching technique. Structural changes of the prepared glasses by addition of transition metal oxides, CoO and NiO are investigated by UV–vis–NIR, FT-IR spectroscopy and XRD. The XRD pattern indicates the amorphous nature of prepared glasses. FT-IR measurements of the all glasses revealed that the network structure of the glasses are mainly based on BO 3 and BO 4 units placed in different structural groups in which the BO 3 units being dominant. The optical absorption spectra suggest the site symmetry of Co 2+ and Ni 2+ ions in the glasses are near Octahedral. Crystal field and inter-electronic repulsion parameters are also evaluated. The optical band gap and Urbach energies exhibited the mixed alkali effect. Various physical parameters such as density, refractive index, optical dielectric constant, polaron radius, electronic polarizability and inter-ionic distance are also determined.
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mixed alkali effect and optical properties of ni2 doped 20zno xli2o 30 x na2o 50b2o3 glasses
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011Co-Authors: Raghavendra T Rao, Ch Rama Krishna, Ch Venkata Reddy, U Udayachandran S Thampy, Y P Reddy, P S Rao, R V S S N RavikumarAbstract:Abstract Optical and physical properties of Ni 2+ doped 20ZnO + x Li 2 O + (30 − x )Na 2 O + 50B 2 O 3 (5 ≤ x ≤ 25) glasses are carried out at room temperature. Powder XRD pattern of all the glass samples confirms the amorphous nature. Several physical parameters are evaluated for all the glasses with respect to the composition. The optical absorption spectra confirm the site symmetry of the Ni 2+ doped glasses are near Octahedral. Crystal field and inter-electronic repulsion parameters are also evaluated. It is interesting to observe that the optical band gap and Urbach energies exhibit the mixed alkali effect. The FT-IR spectral investigations of Ni 2+ doped glasses exhibit characteristic vibrations of BO 3 and BO 4 units.
Ismail Yilmaz - One of the best experts on this subject based on the ideXlab platform.
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superior sensor for be2 ion recognition via the unprecedented Octahedral Crystal structure of a one dimensional coordination polymer of crown fused zinc phthalocyanine
Inorganic Chemistry, 2019Co-Authors: Ozgur Yavuz, Yusuf Alcay, Kerem Kaya, Mustafa Sezen, Secil Kirlangic Atasen, Mustafa Semih Yildirim, Yilmaz Ozkilic, Nurcan Şenyurt Tuzun, Ismail YilmazAbstract:The unprecedented one-dimensional (1-D) coordination polymer of crown fused zinc phthalocyanine (P-CfZnPc) with an Octahedral Crystal structure and with intermolecular packing that has superior multichannel sensor ability for Be2+ ion recognition was prepared and characterized by single-Crystal X-ray diffraction analysis (XRD) and a wide range of spectroscopic and voltammetric methods. An exceptional feature of the Crystal structure of P-CfZnPc is that each zinc ion in the phthalocyanine (Pc) polymer is coordinated by the four isoindole nitrogen atoms and an outer oxygen atom of the Pc molecule. This structure is the first example of an Octahedral arrangement in a 1-D polymeric chain for zinc phthalocyanines (ZnPcs) and zinc porphyrins (ZnPs) reached without the presence of a coordinating solvent, which was confirmed by XRD analysis. Interestingly, this (1-D) coordination polymer preserves its conformation in THF (tetrahydrofuran) solution, thereby effectively preventing aggregation. This result was confirmed by the particle size of the molecule (125 nm) using dynamic light scattering (DLS) and matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectra as well as UV-vis spectroscopy. The sensor has long-term stability (more than 3 months in solution), a very low response time (less than 1 s), and nonaggregating ability, facilitating the accurate determination of ultra-trace amounts of Be2+ (lower than 1 ppb), which is extremely important in terms of human health and environmental protection. The sensor can highly selectively and sensitively bind Be2+ among Li+, Na+, K+, Cs+, Mg2+, Ca2+, Ba2+, Al3+, Co2+, Hg2+, Ni2+, Pb2+, and Zn2+ ions via Be2+-induced J aggregation of Pc molecules. Such a binding leads to not only a significant decrease in Pc absorption (677 nm) as well as the creation of new absorption (720 nm) but also fluorescence emission quenching (690 nm). Furthermore, the sensor displayed highly selective voltammetric recognition for Be2+ following J aggregation/disaggregation in the second reduction process. The binding mechanism of the sensor and Be2+ ion was also explained on the basis of TD-DFT calculations.
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Superior Sensor for Be2+ Ion Recognition via the Unprecedented Octahedral Crystal Structure of a One-Dimensional Coordination Polymer of Crown Fused Zinc Phthalocyanine
2018Co-Authors: Ozgur Yavuz, Yusuf Alcay, Kerem Kaya, Mustafa Sezen, Secil Kirlangic Atasen, Mustafa Semih Yildirim, Yilmaz Ozkilic, Nurcan Şenyurt Tuzun, Ismail YilmazAbstract:The unprecedented one-dimensional (1-D) coordination polymer of crown fused zinc phthalocyanine (P-CfZnPc) with an Octahedral Crystal structure and with intermolecular packing that has superior multichannel sensor ability for Be2+ ion recognition was prepared and characterized by single-Crystal X–ray diffraction analysis (XRD) and a wide range of spectroscopic and voltammetric methods. An exceptional feature of the Crystal structure of P-CfZnPc is that each zinc ion in the phthalocyanine (Pc) polymer is coordinated by the four isoindole nitrogen atoms and an outer oxygen atom of the Pc molecule. This structure is the first example of an Octahedral arrangement in a 1-D polymeric chain for zinc phthalocyanines (ZnPcs) and zinc porphyrins (ZnPs) reached without the presence of a coordinating solvent, which was confirmed by XRD analysis. Interestingly, this (1-D) coordination polymer preserves its conformation in THF (tetrahydrofuran) solution, thereby effectively preventing aggregation. This result was confirmed by the particle size of the molecule (125 nm) using dynamic light scattering (DLS) and matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectra as well as UV–vis spectroscopy. The sensor has long-term stability (more than 3 months in solution), a very low response time (less than 1 s), and nonaggregating ability, facilitating the accurate determination of ultra-trace amounts of Be2+ (lower than 1 ppb), which is extremely important in terms of human health and environmental protection. The sensor can highly selectively and sensitively bind Be2+ among Li+, Na+, K+, Cs+, Mg2+, Ca2+, Ba2+, Al3+, Co2+, Hg2+, Ni2+, Pb2+, and Zn2+ ions via Be2+-induced J aggregation of Pc molecules. Such a binding leads to not only a significant decrease in Pc absorption (677 nm) as well as the creation of new absorption (720 nm) but also fluorescence emission quenching (690 nm). Furthermore, the sensor displayed highly selective voltammetric recognition for Be2+ following J aggregation/disaggregation in the second reduction process. The binding mechanism of the sensor and Be2+ ion was also explained on the basis of TD-DFT calculations
Ozgur Yavuz - One of the best experts on this subject based on the ideXlab platform.
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superior sensor for be2 ion recognition via the unprecedented Octahedral Crystal structure of a one dimensional coordination polymer of crown fused zinc phthalocyanine
Inorganic Chemistry, 2019Co-Authors: Ozgur Yavuz, Yusuf Alcay, Kerem Kaya, Mustafa Sezen, Secil Kirlangic Atasen, Mustafa Semih Yildirim, Yilmaz Ozkilic, Nurcan Şenyurt Tuzun, Ismail YilmazAbstract:The unprecedented one-dimensional (1-D) coordination polymer of crown fused zinc phthalocyanine (P-CfZnPc) with an Octahedral Crystal structure and with intermolecular packing that has superior multichannel sensor ability for Be2+ ion recognition was prepared and characterized by single-Crystal X-ray diffraction analysis (XRD) and a wide range of spectroscopic and voltammetric methods. An exceptional feature of the Crystal structure of P-CfZnPc is that each zinc ion in the phthalocyanine (Pc) polymer is coordinated by the four isoindole nitrogen atoms and an outer oxygen atom of the Pc molecule. This structure is the first example of an Octahedral arrangement in a 1-D polymeric chain for zinc phthalocyanines (ZnPcs) and zinc porphyrins (ZnPs) reached without the presence of a coordinating solvent, which was confirmed by XRD analysis. Interestingly, this (1-D) coordination polymer preserves its conformation in THF (tetrahydrofuran) solution, thereby effectively preventing aggregation. This result was confirmed by the particle size of the molecule (125 nm) using dynamic light scattering (DLS) and matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectra as well as UV-vis spectroscopy. The sensor has long-term stability (more than 3 months in solution), a very low response time (less than 1 s), and nonaggregating ability, facilitating the accurate determination of ultra-trace amounts of Be2+ (lower than 1 ppb), which is extremely important in terms of human health and environmental protection. The sensor can highly selectively and sensitively bind Be2+ among Li+, Na+, K+, Cs+, Mg2+, Ca2+, Ba2+, Al3+, Co2+, Hg2+, Ni2+, Pb2+, and Zn2+ ions via Be2+-induced J aggregation of Pc molecules. Such a binding leads to not only a significant decrease in Pc absorption (677 nm) as well as the creation of new absorption (720 nm) but also fluorescence emission quenching (690 nm). Furthermore, the sensor displayed highly selective voltammetric recognition for Be2+ following J aggregation/disaggregation in the second reduction process. The binding mechanism of the sensor and Be2+ ion was also explained on the basis of TD-DFT calculations.
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Superior Sensor for Be2+ Ion Recognition via the Unprecedented Octahedral Crystal Structure of a One-Dimensional Coordination Polymer of Crown Fused Zinc Phthalocyanine
2018Co-Authors: Ozgur Yavuz, Yusuf Alcay, Kerem Kaya, Mustafa Sezen, Secil Kirlangic Atasen, Mustafa Semih Yildirim, Yilmaz Ozkilic, Nurcan Şenyurt Tuzun, Ismail YilmazAbstract:The unprecedented one-dimensional (1-D) coordination polymer of crown fused zinc phthalocyanine (P-CfZnPc) with an Octahedral Crystal structure and with intermolecular packing that has superior multichannel sensor ability for Be2+ ion recognition was prepared and characterized by single-Crystal X–ray diffraction analysis (XRD) and a wide range of spectroscopic and voltammetric methods. An exceptional feature of the Crystal structure of P-CfZnPc is that each zinc ion in the phthalocyanine (Pc) polymer is coordinated by the four isoindole nitrogen atoms and an outer oxygen atom of the Pc molecule. This structure is the first example of an Octahedral arrangement in a 1-D polymeric chain for zinc phthalocyanines (ZnPcs) and zinc porphyrins (ZnPs) reached without the presence of a coordinating solvent, which was confirmed by XRD analysis. Interestingly, this (1-D) coordination polymer preserves its conformation in THF (tetrahydrofuran) solution, thereby effectively preventing aggregation. This result was confirmed by the particle size of the molecule (125 nm) using dynamic light scattering (DLS) and matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectra as well as UV–vis spectroscopy. The sensor has long-term stability (more than 3 months in solution), a very low response time (less than 1 s), and nonaggregating ability, facilitating the accurate determination of ultra-trace amounts of Be2+ (lower than 1 ppb), which is extremely important in terms of human health and environmental protection. The sensor can highly selectively and sensitively bind Be2+ among Li+, Na+, K+, Cs+, Mg2+, Ca2+, Ba2+, Al3+, Co2+, Hg2+, Ni2+, Pb2+, and Zn2+ ions via Be2+-induced J aggregation of Pc molecules. Such a binding leads to not only a significant decrease in Pc absorption (677 nm) as well as the creation of new absorption (720 nm) but also fluorescence emission quenching (690 nm). Furthermore, the sensor displayed highly selective voltammetric recognition for Be2+ following J aggregation/disaggregation in the second reduction process. The binding mechanism of the sensor and Be2+ ion was also explained on the basis of TD-DFT calculations
P S Rao - One of the best experts on this subject based on the ideXlab platform.
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physical and optical properties of co2 ni2 doped 20zno xli2o 30 x k2o 50b2o3 5 x 25 glasses observation of mixed alkali effect
Materials Research Bulletin, 2012Co-Authors: G Krishna N Kumari, Ch Rama Krishna, P S Rao, Sk Muntaz Begum, D V Sathish, P N Murthy, R V S S N RavikumarAbstract:Abstract Co 2+ and Ni 2+ ions doped 20ZnO + x Li 2 O + (30 − x ) K 2 O + 50B 2 O 3 (5 ≤ x ≤ 25) mol% glasses are prepared using melt quenching technique. Structural changes of the prepared glasses by addition of transition metal oxides, CoO and NiO are investigated by UV–vis–NIR, FT-IR spectroscopy and XRD. The XRD pattern indicates the amorphous nature of prepared glasses. FT-IR measurements of the all glasses revealed that the network structure of the glasses are mainly based on BO 3 and BO 4 units placed in different structural groups in which the BO 3 units being dominant. The optical absorption spectra suggest the site symmetry of Co 2+ and Ni 2+ ions in the glasses are near Octahedral. Crystal field and inter-electronic repulsion parameters are also evaluated. The optical band gap and Urbach energies exhibited the mixed alkali effect. Various physical parameters such as density, refractive index, optical dielectric constant, polaron radius, electronic polarizability and inter-ionic distance are also determined.
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mixed alkali effect and optical properties of ni2 doped 20zno xli2o 30 x na2o 50b2o3 glasses
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011Co-Authors: Raghavendra T Rao, Ch Rama Krishna, Ch Venkata Reddy, U Udayachandran S Thampy, Y P Reddy, P S Rao, R V S S N RavikumarAbstract:Abstract Optical and physical properties of Ni 2+ doped 20ZnO + x Li 2 O + (30 − x )Na 2 O + 50B 2 O 3 (5 ≤ x ≤ 25) glasses are carried out at room temperature. Powder XRD pattern of all the glass samples confirms the amorphous nature. Several physical parameters are evaluated for all the glasses with respect to the composition. The optical absorption spectra confirm the site symmetry of the Ni 2+ doped glasses are near Octahedral. Crystal field and inter-electronic repulsion parameters are also evaluated. It is interesting to observe that the optical band gap and Urbach energies exhibit the mixed alkali effect. The FT-IR spectral investigations of Ni 2+ doped glasses exhibit characteristic vibrations of BO 3 and BO 4 units.
Ch Rama Krishna - One of the best experts on this subject based on the ideXlab platform.
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physical and optical properties of co2 ni2 doped 20zno xli2o 30 x k2o 50b2o3 5 x 25 glasses observation of mixed alkali effect
Materials Research Bulletin, 2012Co-Authors: G Krishna N Kumari, Ch Rama Krishna, P S Rao, Sk Muntaz Begum, D V Sathish, P N Murthy, R V S S N RavikumarAbstract:Abstract Co 2+ and Ni 2+ ions doped 20ZnO + x Li 2 O + (30 − x ) K 2 O + 50B 2 O 3 (5 ≤ x ≤ 25) mol% glasses are prepared using melt quenching technique. Structural changes of the prepared glasses by addition of transition metal oxides, CoO and NiO are investigated by UV–vis–NIR, FT-IR spectroscopy and XRD. The XRD pattern indicates the amorphous nature of prepared glasses. FT-IR measurements of the all glasses revealed that the network structure of the glasses are mainly based on BO 3 and BO 4 units placed in different structural groups in which the BO 3 units being dominant. The optical absorption spectra suggest the site symmetry of Co 2+ and Ni 2+ ions in the glasses are near Octahedral. Crystal field and inter-electronic repulsion parameters are also evaluated. The optical band gap and Urbach energies exhibited the mixed alkali effect. Various physical parameters such as density, refractive index, optical dielectric constant, polaron radius, electronic polarizability and inter-ionic distance are also determined.
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mixed alkali effect and optical properties of ni2 doped 20zno xli2o 30 x na2o 50b2o3 glasses
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2011Co-Authors: Raghavendra T Rao, Ch Rama Krishna, Ch Venkata Reddy, U Udayachandran S Thampy, Y P Reddy, P S Rao, R V S S N RavikumarAbstract:Abstract Optical and physical properties of Ni 2+ doped 20ZnO + x Li 2 O + (30 − x )Na 2 O + 50B 2 O 3 (5 ≤ x ≤ 25) glasses are carried out at room temperature. Powder XRD pattern of all the glass samples confirms the amorphous nature. Several physical parameters are evaluated for all the glasses with respect to the composition. The optical absorption spectra confirm the site symmetry of the Ni 2+ doped glasses are near Octahedral. Crystal field and inter-electronic repulsion parameters are also evaluated. It is interesting to observe that the optical band gap and Urbach energies exhibit the mixed alkali effect. The FT-IR spectral investigations of Ni 2+ doped glasses exhibit characteristic vibrations of BO 3 and BO 4 units.
