Crystal structure, spectroscopic investigations and quantum chemical computational study of 5-(diethylamino)-2-((3-nitrophenylimino)methyl)phenol

Design, Synthesis, and Density Functional Theory Studies of Indole Hydrazones as Colorimetric "Naked Eye" Sensors for F Ions

A new series of sensors SM-1 to SM-3 was designed and synthesized using indole carboxaldehydes (2a-2c) and 2,4-dinitrophenyl hydrazine. Accompanied by the synthesis, density functional theory investigation was also accomplished at the M06-2X/6-311G+(d,p) functional. A reduction in band gap (ΔE = 4.702-4.230 eV) along with a bathochromic shift (λ_max = 433.223-471.584 nm) was seen in deprotonated chromophores than their neutral sensors. Further, significant charge transference from indole toward dinitrophenyl hydrazine was also examined. Global reactivity parameters also expressed the greater stability of sensors than that of their deprotonated form. SM-3 displayed high selectivity toward F ions as compared to SM-1 and SM-2, which respond to both F^- and CN^- ions. The electronic absorption spectrum was recorded in CH₃CN. The sensor SM-3 showed high selectivity toward F^- ions with a low detection limit (8.69 × 10^-8), and the binding constant for SM-3 was determined as 7.7 × 10⁵. The sensor displayed naked eye views as the color of solution changed from mustard to purple with a red shift of 96 nm. The mechanism suggests deprotonation from the NH group, which was confirmed by ¹H NMR. The sensor is found to be useful for detection of F^- ions in the real sample and for analytical application (test strip).

Drug-Induced Myelosuppression in Kidney Transplant Patients

Renal transplant is considered the best therapeutic option for suitable patients with end-stage kidney failure. Hematological complications that occur after kidney transplant include posttransplant anemia, leukopenia, neutropenia, and thrombocytopenia. Severely persistent leukopenia and neutropenia events predispose patients to infection, including opportunistic infections. The mainstay tactic for such complications is to reduce the burden of the immunosuppression by the offending agent, but this tactic is associated with increased risk of acute rejection. Given the absence of laboratory investigations to specifically identify the culprit, a complete withdrawal of these agents may be the ultimate diagnostic option. Future therapeutic strategies, however, should focus on reducing the immunosuppressive burden, the introduction of less myelotoxic agents, early recognition, and prompt treatment of infectious episodes. This will help in the optimization of the myelopoietic function and normalization of the hematological profile, resulting in better allograft and patient survival.

Synthesis, crystal structure and computational studies of a new Schiff base compound: (E)-4-bromo-2-eth-oxy-6-{[(2-meth-oxy-phen-yl)imino]meth-yl}phenol

The title compound, C16H16BrNO3, which shows enol-imine tautomerism, crystallizes in the monoclinic P21/c space group. All non-H atoms of the mol-ecule are nearly coplanar, with a maximum deviation of 0.274 (3) Å. In the crystal, mol-ecules are held together by weak C-H⋯O, π-π and C-H⋯π inter-actions. The E/Z isomerism and enol/keto tautomerism energy barriers of the compound have been calculated by relaxed potential energy surface scan calculations with DFT methods. To observe the changes in the aromatic ring, HOMA aromaticity indexes were calculated during the scan process. Total energy and HOMA change curves were obtained to visualize results of the scan calculations.