It has been shown by thermodynamic and electro-chemical methods that coordination interactions are involved in the process of incorporation of rare-earth elements and/or Fe into Langmuir monolayers of oligomer with alkyl fragment. A coordination mechanism, which is responsible for self-organization of octahedral Fe(II)-complexes of nano-cyclic ligands obtained from oligomer of thiophene pyrrole series derivatives in compressed Langmuir monolayers has been proposed. It has been established that a coordinational-polymeric hexagonal network of nano-cyclic ligands with metal centers is formed at the phase transition when compressing the Langmuir monolayers of thiophene pyrrole series oligomer with alkyl fragment on surface of subphase with rare-earth (Sm, Er, Ce) and/or Fe ions.
DNA-nanosensor based on multiwalled carbon nanotubes (MWCNTs) decorated by nanocyclic thiophene-pyrrole complexes of octahedral high-spin Fe has been proposed for high-performance sensing of DNA-hybridization utilizing a surface-enhanced spin-dependent CNT-plasmon resonance. This DNA-nanosensor operates on screening and quenching effects at Raman scattering of light in duplexes DNA-probe/DNA-target at complementary pairing of nucleotides in DNA. Single nucleotide polymorphism (SNP) genotyping has been successfully performed for DNA samples from healthy and cancer-suffering donors.
An enhanced Raman spectroscopy method based on a plasmon resonance in ultrathin metal-containing LB-film deposited on nanoporous anodic alumina supports has been proposed. This material has been utilized to enhance Raman scattering of light in fluorescent-labeled subcellular membrane structures. It has been shown that the plasmon resonance between vibrational modes of the organometallic complexes monolayers and dye-labeled subcellular structures happens. It makes possible to detect interactions between living cell monolayers and an extracellular matrix.
We offer a highly sensitive and reproducible dielectric-spectroscopy assay of deoxyribonucleic acid (DNA) sequence on a platform of quantum graphene-like structures arranged on nanoporous alumina to correctly identifying an infectious agent in a native double-stranded (ds) DNA. The hybridization of complementary target DNA with probe DNA in the sensor sensitive layer leads to penetration of the formed singlestranded (ss) target DNA into the underlayer nanoporous anodic alumina through the nanocavities of LB-film from organometallic complexes. This results in linking of MWCNT ends, shielding of Helmholtz double layer and following decrease of electrical capacitance of the sensor. The novel electrochemical impedimetric DNA sensor with selforganized multi-walled carbon nanotube (MWCNT) bundles decorated by organometallic complexes as transducer has been utilized to detect the viral DNA in the biological samples of patients with virus infection at DNA concentration as low as 1.0-1.3 ng/μL.
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