236 research outputs found
Synthesis, Crystal Structure, Thermal and Luminescent Characterization of Two New 3D Cadmium–Carboxylate Frameworks
No full textTwo new cadmium coordination polymers have been synthesized with composition {[Cd2(tma)(atz) (H2O)].(H2O)}n (1) (tmaH3 = benzene-1,3,5-tricarboxylicacid, atzH = 5-aminotetrazole) and [Cd(isoor)2(H2O)2] (2) (isoorH = isoorotic acid). X-ray single crystal structure
analysis reveals that complex 1 is 3D coordination polymer. However 2 is mononuclear and turned 3D via hydrogen bonding. Thermogravimetric and luminescence characterization of the complexes were done
Two new metal-organic coordination polymers of lead with O-, N-donor ligands: Synthesis, characterization, luminescence and thermal behavior
No full textThe synthesis of two new lead(II) coordination polymers, [Pb2(picOH)4] .H2O (1) and [Pb3(Sip)2-
(H2O)2] .H2O (2) has been reported, where HpicOH = 3-hydroxypicolinic acid and NaH2Sip = 5-sulfoi-
sophthalic acid monosodium salt .Both the complexes were structurally characterized by X-ray single
crystal diffraction analysis.Complex 1, where the 3-hydroxypicolinate ligand is used for the first time
in conjunction withPb(II), revealed to bea1D polymericarray. Complex 2 showed a 3D structure with
5-sulfoisophthalate ligand adopting two novel binding modes of high denticity (eta-6mu-6 and eta-7mu-7). The
photoluminescence and thermal properties of the two complexes have been studied
3D Coordination Network of Ag(I) Ions with μ 3 -Bridging Melamine Ligands
No full textA new 3D silver complex [Ag(mela)(H2O)(NO3)]n (1) (mela = melamine or 2,4,6-triaminotriazine) is synthesized and characterized by single crystal X-ray diffraction, IR, and elemental analysis. The structural characterization shows that the compound crystallizes in space
group C c, a = 8.181(2), b = 10.269(3) c = 11.347(3) A ° , b = 105.88(2) A, Z = 4. Out of several structurally characterized transition metal compounds comprising melamine, the titled complex represents a rare example of l3-melamine coordination mode realized through the heterocycle nitrogen donors. The fluorescent property of complex 1 was investigated and the mechanism was validated
by means of a density functional theory (DFT) calculation
Chemodosimetric Detection of the Acetate Anion by Using the Template Reaction Method via a Fluorescence “Turn-Off” Signal
No full textThe compartmental ligand 2,6-bis[2-(N-ethyl)thiopheneiminomethyl]-
4-chlorophenol (HL) undergoes Cu(ClO4)2 induced
partial hydrolysis to yield a monoamine ligand
4-chloro-2-formyl-6-[2-(thiophen-2-yl)ethyliminomethyl]-
phenol (HL ). On further reaction with Cu(ClO4)2, HL produces
a dinuclear complex, [Cu2(L )2(ClO4)2] (2), which has
been characterized in solution by UV/Vis, ATR, NMR, and
ESI-MS spectral techniques and in the solid state by X-ray
single-crystal structure analysis. The in situ generated 2 is highly fluorescent
Two New Coordination Polymers of Manganese(II) with O/O- and N/O-Donor Ligands: Synthesis, Structure, Luminescence Study and Thermal Behavior
No full textTwo new coordination polymers of Mn(II), of formula C12H18MnN8O6 (1) and C21H16MnO9 (2), have been synthesized by using two different kind of ligands, namely 5-methyl-7-oxo-(1,2,4)triazolo(1,5-a)pyrimidine (HmtpO) and 3-(2-furyl)prop-2-enoic acid (fproH). The
X-ray single crystal structure analysis shows that complex 1 is a discrete molecular complex that turns into a 3D network through hydrogen bonding and p–p stacking interactions. Complex 2 is 1D polymeric chain comprising hexacoordinated Mn(II) centers. Luminescence study
revealed the presence of intraligand p*–p transitions. The thermal stability of the complexes has been also investigated
by thermogravimetric analysis
2D and 1D Coordination Polymers of Ag(I) Ions with 2,6-Naphthalenedicarboxylate and N–Donor Coligands
No full textTwo new Ag(I) coordination polymers [Ag2(mepyz)](2,6-ndc)]n (1) and [Ag4(4,40-bipy)]4(2,6-ndc)2.8(H2O) (2) (where 2,6-ndcH2 = 2,6-napthalene dicarboxylic acid, mepyz = 2-methyl pyrazine and 4,40-bipy = 4,4'-bipyridine) have been synthesized and characterized
by single crystal X-ray diffraction analysis. Complex 1 displays a 2D rectangular grid architecture comprising
short Ag-Ag interactions, while 2 is a 1D coordination polymer: both enlarge their dimensionality to 3D via weak interactions. Luminescence study performed on complexes
as well on ligands shows metal perturbed intraligand CT
transition
On the diagnosis of X-ray satellites and hypersatellites for low-<i>Z</i> atoms
No full text In this paper, the idea of the Moseley plot is extended to X-ray satellites and hypersatellites with great advantage for atoms having low atomic number. It gives a fair understanding of the assignments of the X-ray satellite and hypersatellite lines. </jats:p
Syllogistic reasoning by strand algebra
No full textIn this paper, we introduce DNA strand algebra, which can be defined as a branch of process algebra, for modelling dynamic DNA devices called DNA tweezers whose operation is based on the mechanism of DNA strand displacement. The main components of DNA strand algebra are DNA strands, DNA gates, and their interactions. In this paper we demonstrate a DNA fuelled molecular machine for reasoning with dispositions which is basically a challenging problem to handle commonsense reasoning. Finally, we have designed a successful model based on the syntax and semantics of DNA strand algebra to perform syllogistic reasoning with DNA tweezers
Non-regular unary language and parallel communicating Watson–Crick automata systems
No full textIn 2006, Czeizler et al. introduced parallel communicating Watson–Crick automata system. They showed that parallel communicating Watson–Crick automata system can accept the non-regular unary language L={an2, where n\u3e1} using non-injective complementarity relation and three components. In this paper, we improve on Czeizler et al.\u27s work by showing that parallel communicating Watson–Crick automata system can accept the same language L using just two components
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