01105nas a2200205 4500008004100000022001400041245013900055210006900194260007100263300001400334490000700348520029400355100001800649700002100667700001700688700002000705700002700725700001700752856013000769 2013 eng d a0020-166900aAzide-functionalized lanthanide-based metal-organic frameworks showing selective CO2 gas adsorption and postsynthetic cavity expansion0 aAzidefunctionalized lanthanidebased metalorganic frameworks show a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAPR a3588-35900 v523 a

We report herein selective CO2 gas adsorption by two azide-functionalized lanthanide-based metal-organic frameworks (MOFs). This work also demonstrates that azide-functionalized MOFs can be used for postsynthetic cavity expansion, further corroborated by enhanced gas-sorption data.

1 aGanguly, Sumi1 aPachfule, Pradip1 aBala, Sukhen1 aGoswami, Arijit1 aBhattacharya, Sudeshna1 aMondal, Raju uhttps://library.ncl.res.in/content/azide-functionalized-lanthanide-based-metal-organic-frameworks-showing-selective-co2-gas-001198nas a2200169 4500008004100000245015300041210006900194260000800263300001400271490000700285520053500292100002000827700001700847700002100864700001700885856012600902 2013 eng d00aComprehensive study on mutual interplay of multiple V-shaped ligands on the helical nature of a series of coordination polymers and their properties0 aComprehensive study on mutual interplay of multiple Vshaped liga cDEC a5487-54980 v133 a

{V-shaped ligands are commonly used for helical coordination polymer synthesis. However, employment of multiple V-shaped ligands does not always lead to a helical network. The mutual interplay of two V-shaped ligands, which is neither easily predictable nor well documented, plays a major role directing the self-assembly of the resultant network. We report here the construction of a series of novel coordination polymers {[Ni(OBA)(H2MDP)(H2O)]center dot(DMF)(3)}(n) (1),{[Ni(FBA)(H2MDP)]center dot(H2O)(3)center dot(DMF)\

1 aGoswami, Arijit1 aBala, Sukhen1 aPachfule, Pradip1 aMondal, Raju uhttps://library.ncl.res.in/content/comprehensive-study-mutual-interplay-multiple-v-shaped-ligands-helical-nature-series-002333nas a2200217 4500008004100000022001400041245017900055210006900234260007100303300001400374490000700388520144900395100001701844700002601861700002201887700001801909700002601927700001901953700001701972856012601989 2015 eng d a0020-166900aConstruction of polynuclear lanthanide (Ln = Dy-III, Tb-III, and Nd-III) cage complexes using pyridine-pyrazole-based ligands: versatile molecular topologies and smm behavior0 aConstruction of polynuclear lanthanide Ln DyIII TbIII and NdIII  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcSEP a8197-82060 v543 a

Employment of two different pyridyl pyrazolyl-based ligands afforded three octanudear lanthanide(III) (Ln = Dy, Tb) cage compounds and one hexanudear neodymium(III) coordination cage, exhibiting versatile molecular architectures including a butterfly core. Relatively less common semirigid pyridyl pyrazolyl-based asymmetric ligand systems show an interesting trend of forming polynuclear lanthanide cage complexes with different coordination environments around the metal centers. It is noteworthy here that construction of lanthanide complex itself is a challenging task in a ligand system as soft N-donor rich as pyridyl pyrazol. We report herein some lanthanide complexes using ligand containing only one or two O-donors compare to five N-coordinating sites. The resultant multinuclear lanthanide complexes show interesting magnetic and spectroscopic features originating from different spatial arrangements of the metal ions. Alternating current (ac) susceptibility measurements of the two dysprosium complexes display frequency- and temperature-dependent out-of-phase signals in zero and 0.5 T direct current field, a typical characteristic feature of single-molecule magnet (SMM) behavior, indicating different energy reversal barriers due to different molecular topologies. Another aspect of this work is the occurrence of the not-so-common SMM behavior of the terbium complex, further confirmed by ac susceptibility measurement.

1 aBala, Sukhen1 aBishwas, Mousumi, Sen1 aPramanik, Bhaskar1 aKhanra, Sumit1 aFromrn, Katharina, M.1 aPoddar, Pankaj1 aMondal, Raju uhttps://library.ncl.res.in/content/construction-polynuclear-lanthanide-ln-dy-iii-tb-iii-and-nd-iii-cage-complexes-using-001992nas a2200193 4500008004100000245012700041210006900168260000800237300001600245490000600261520127800267100001701545700001901562700002701581700002601608700001901634700001701653856012801670 2017 eng d00aLn(8) (Ln = Gd, Ho, Er, Yb) Butterfly core-exhibiting magnetocaloric effect and field-induced SMM behavior for Er analouge0 aLn8 Ln Gd Ho Er Yb Butterfly coreexhibiting magnetocaloric effec cDEC a11341-113450 v23 a

In this article, we report four pyridyl-pyrazolyl based poly-nuclear cluster complexes with Ln(8) {Ln = [Gd-8(III)(mu(3)-OH)(4)(L-1)(4)(DEA)(4)Cl-4](DMF)(2)(MeOH)(1), [Ho-8(III)(mu(3)-OH)(4)(L-1)(4)(DEA)(4)Cl-4](2), [Er-8(III)(mu(3)-OH)(4)(L-1)(4)(DEA)(4)Cl-4](DMF)(MeOH)(H2O)(3), [Yb-8(III)(mu(3)-OH)(4)(L-1)(4)(DEA)(4)Cl-4](DMF)(MeOH)(4) [DEA = Diethanolamine] cores. The impetus for this study was to explore the magnetic behaviour of lanthanide ions which are often ignored or overlooked. X-ray crystal analysis show that these complexes are isostructural and exhibit an interesting butterfly like topology. The semi-rigidity and asymmetric nature of the ligand led to different coordination environment around the metal centres. The lanthanide ions adopt two types of geometry, a bicapped trigonal prism and a distorted square antiprismatic geometry around the metal center. Such dissimilar coordination environments around the lanthanide centre can have profound effects on their magnetic behaviour. Indeed, the magnetic measurements revealed significant magnetocaloric effect for octanuclear gadolinium complex 1 with magnetic entropy change (-Delta S-m ) of 31.4 J kg(-1) K-1 for Delta H = 9 T at T = 3 K whereas Er analogue complex 3 displayed SMM behavior.

1 aBala, Sukhen1 aAdhikary, Amit1 aBhattacharya, Sudeshna1 aBishwas, Mousumi, Sen1 aPoddar, Pankaj1 aMondal, Raju uhttps://library.ncl.res.in/content/ln8-ln-gd-ho-er-yb-butterfly-core-exhibiting-magnetocaloric-effect-and-field-induced-smm