Severity: Warning
Message: file_get_contents(https://...@gmail.com&api_key=61f08fa0b96a73de8c900d749fcb997acc09): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
Filename: helpers/my_audit_helper.php
Line Number: 143
Backtrace:
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 143
Function: file_get_contents
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 209
Function: simplexml_load_file_from_url
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 994
Function: getPubMedXML
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 3134
Function: GetPubMedArticleOutput_2016
File: /var/www/html/application/controllers/Detail.php
Line: 574
Function: pubMedSearch_Global
File: /var/www/html/application/controllers/Detail.php
Line: 488
Function: pubMedGetRelatedKeyword
File: /var/www/html/index.php
Line: 316
Function: require_once
The cyanidocobaltate of formula fac-PPh [Co ( Tp)(CN) ] ⋅ CH CN (1) has been used as a metalloligand to prepare polynuclear magnetic complexes ( Tp=hydrotris(3,5-dimethylpyrazol-1-yl)borate). The association of 1 with in situ prepared [Fe (bik) (MeCN) ](OTf) (bik=bis(1-methylimidazol-2-yl)ketone) leads to a molecular square of formula {[Co {( Tp)}(CN) ] [Fe (bik) ] }(OTf) ⋅ 4MeCN ⋅ 2H O (2), whereas the self-assembly of 1 with preformed cluster [Co (OH )(piv) (Hpiv) ] in MeCN leads to the two-dimensional network of formula {[Co (piv) ] [Co ( Tp)(CN) ] ⋅ 2CH CN} (3). These compounds were structurally characterized via single crystal X-ray analysis and their spectroscopic (FTIR, UV-Vis and Co NMR) properties and magnetic behaviours were also investigated. Bulk magnetic susceptibility measurements reveal that 1 is diamagnetic and 3 is paramagnetic throughout the explored temperature range, whereas 2 exhibits sharp spin transition centered at ca. 292 K. Compound 2 also exhibits photomagnetic effects at low temperature, selective light irradiations allowing to promote reversibly and repeatedly low-spin⇔high-spin conversion. Besides, the diamagnetic nature of the Co(III) building block allows us studying these compounds by means of Co NMR spectroscopy. Herein, a Co chemical shift has been used as a magnetic probe to corroborate experimental magnetic data obtained from bulk magnetic susceptibility measurements. An influence of the magnetic state of the neighbouring atoms is observed on the Co NMR signals. Moreover, for the very first time, Co NMR technique has been successfully introduced to investigate molecular materials with distinct magnetic properties.
Download full-text PDF |
Source |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9543823 | PMC |
http://dx.doi.org/10.1002/chem.202200783 | DOI Listing |
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