Abstract Invited for the cover of this issue are Sankar Prasad Rath and co‐workers at the Indian Institute of Technology (IIT Kanpur) and the University of Sassari. The image depicts through space interactions in a cofacial Ag II porphyrin dimer upon stepwise oxidations, which allow the estimation of the structure and energy characteristics of metallophilic interactions between Ag II /Ag II (d 9 /d 9 ), Ag III /Ag III (d 8 /d 8 ) and also mixed‐valent Ag II /Ag III (d 9 /d 8 ) complexes. Read the full text of the article at 10.1002/chem.201901731 .
In atmospheric and meteorological studies, missing values in acquired research data possess serious challenge on the integrity of research output emanating from their use. Missing values or readings may arise due to temporal or permanent failure in power supply to the measuring weather station. In this work, effort was made to address the fundamental issue of remote power at a standalone solar powered weather stations by professionally applying solar photovoltaic power system installation technique and the requisite knowledge of local parameters of the installed location to design a customize power supply pack for the weather station. The protocol involves an elaborate electrical load assessment and analysis of the weather station, followed by an independent component wise design formulation leading to selection of suitable solar module, battery, charge controller and voltage regulator along with their outdoor installation design. It was recommended that the design be validated using solar photovoltaic software followed by physical implementation which should be done in line with the system and installation design.
Abstract We have described copper(II)‐iron(III) and copper(II)‐manganese(III) heterobimetallic porphyrin dimers and compared them with the corresponding homobimetallic analogs. UV‐visible spectra are very distinct in the heterometallic species while electrochemical studies demonstrate that these species, as compared to the homobimetallic analog, are much easier to oxidize. Combined Mössbauer, EPR, NMR, magnetic and UV‐visible spectroscopic studies show that upon 2e‐oxidation of the heterobimetallic complexes only ring‐centered oxidation occurs. The energy differences between HOMO and LUMO are linearly dependent with the low‐energy NIR band obtained for the 2e‐oxidized complexes. Also, strong electronic communication between two porphyrin rings through the bridge facilitates coupling between various unpaired spins present while the coupling model depends on the nature of metal ions used. While unpaired spins of Fe(III) and the porphyrin π‐cation radical are strongly antiferromagnetically coupled, such coupling is rather weak between Mn(III) and a porphyrin π‐cation radical. Moreover, the coupling between two π‐cation radicals are much stronger in the 2e‐oxidized complexes of dimanganese(III) and copper(II)‐manganese(III) porphyrin dimers as compared to their diiron(III) and copper(II)‐iron(III) analogs. Furthermore, coupling between the unpaired spins of a π‐cation radical and copper(II) is much stronger in the 2e‐oxidized complex of copper(II)‐iron(III) porphyrin dimer as compared to its copper(II)‐manganese(III) analog. The Mulliken spin density distributions in 2e‐oxidized homo‐ and heterobimetallic complexes show symmetric and asymmetric spread between the two macrocycles, respectively. In both the 2e‐oxidized heterobimetallic complexes, the Cu(II) porphyrin center acts as a charge donor while Fe(III)/Mn(III) porphyrin center act as a charge acceptor. The experimental observations are also strongly supported by DFT calculations.
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