Journal
INORGANIC CHEMISTRY
Volume 57, Issue 7, Pages 4050-4060Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.8b00237
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Funding
- CSIR, New Delhi [09/028(1009)/2017-EMR-I]
- SERB [PDF/2016/000566]
- DBT [BT/01/CEIB/11/v/13]
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Five new coordination polymers (CPs) namely, [{Zn(mu(2)-H2O)(0.5) (5N(3)-IPA) (2,2'-bpe)}](infinity) (1), [{Zn(mu(2)-H2O)](0.5)(5N(3)-IPA) (1,10-phen)}](infinity) (2), [{Zn(5N(3)-IPA) (1,2-bpe)}](infinity) (3), [{Zn (5N(3)-IPA) (1,2-bpey)}](infinity) (4), and [{Zn(H2O)(5N(3)-1PA)(4,4'-tme)}(H2O)(0.5)](infinity) (5) (5N(3)-H(2)IPA 5-azidoisophthalic acid, 2,2'-bpe= 2,2'-bipyridine, 1,10-phen = 1,10-phenanthroline, 1,2-bpe = 1,2-bis(4-pyridyl)ethane, 1,2-bpey = 1,2-bis(4-pyridyl)ethylene, 4,4'-tme = 4,4'-trimethylenedipyridine), have been synthesized based on a mixed ligand approach adopting a solvothermal technique. Depending upon the intrinsic structural flexibility of the bis-pyridyl coligands, interesting structural topologies have also been observed in the resulting CPs: Sra SrAl2 type topology for 3 and a 3-fold interpenetrated dmp topology for 4. A green hand grinding technique has been implemented to reduce the partide size of the CPs to generate nanoscale CPs (NCPs). SEM studies of NCPs reveal the formation of square and spherical particles for NCP 1 and 2, respectively, and nano rod for NCP 3, 4, and 5. Remarkably, when scaled down to nano range all the NCPs retain their crystalline nature. The cytotoxic activity of the NCPs (1-5) has been studied using human colorectal carcinoma cells (HCT 116). Significant cell death is observed for NCP 2, which is further corroborated by cell growth inhibition study. The observed cell death is likely to be due to mitochondrial-assisted apoptosis as is evident from irnrnunofluorescence study.
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