01360nas a2200229   4500008004100000022001400041245005000055210005000105260000900155300001200164490000700176520071800183100001700901700002100918700002500939700001600964700001900980700001700999700001701016700001901033856007801052       2026                        eng d  a0276-733300aKekule diradicaloid with a naphthalene spacer0 aKekule diradicaloid with a naphthalene spacer  cMAR   a624-6270 v453 a<p>
	The availability of a diverse array of carbenes led to the generation of a catalog of carbene based Kekule diradicaloids, but the linker in such molecules is mostly limited to phenylene or biphenylene. Here we have prepared a closed-shell Kekule diradicaloid (2) separated by a naphthalene moiety and stabilized by two capping 5-SIDipp [5-SIDipp = 1,3-bis(2,6-diisopropylphenyl)-imidazolin-2-ylidene] from the reduction of the corresponding dication (1). The combined experimental and computational studies confirm that 2 is in a closed-shell singlet state exhibiting a singlet-triplet energy difference (Delta ES-T) of 18.7 kcal/mol, which is considerably lower than Thiele's version (29.1 kcal/mol).</p>
1 aKundu, Gargi1 aPramanik, Debjit1 aDash, Soumya, Ranjan1 aKumar, Ravi1 aTothadi, Srinu1 aGhosh, Aryya1 aVanka, Kumar1 aSen, Sakya, S.  uhttps://library.ncl.res.in/content/kekule-diradicaloid-naphthalene-spacer