02386nas a2200157   4500008004100000022001400041245014400055210006900199260000800268300001400276490000700290520177300297100002302070700001702093856011802110       2023                        eng d  a1759-995400aExploring SiliaCat Pd-DPP as a recyclable heterogeneous catalyst for the multi-batch direct heteroarylation polymerization for P(NDI2OD-T2)0 aExploring SiliaCat PdDPP as a recyclable heterogeneous catalyst   cJUN  a2803-28190 v143 a<p>
	Donor-acceptor (D-A) conjugated polymers like P(NDI2OD-T2) are important constituents of the active layer of energy conversion devices like all-polymer solar cells. A cost-effective and environmentally amiable pathway for the synthesis of this and similar D-A polymers is highly desirable for the large-scale production of these materials. In this report we have combined two cost-effective approaches, namely, direct heteroarylation polymerization (DHAP) and a recyclable heterogeneous catalyst (SiliaCat Pd-DPP), for the multi-batch synthesis of P(NDI2OD-T2). The general applicability of the approach was first established with a series of conjugated small molecules based on naphthalene diimide and bithiophene derivatives (N1 to N6). The Meitlis hot filtration test and inductively coupled plasma-optical emission spectroscopy (ICP-OES) were conducted to estimate the quantity of leached palladium in the final reaction product. Catalyst recyclability up to five cycles was demonstrated for N1 with &lt;2 ppm leached palladium impurity. A comparison was made with the homogeneous catalyst Pd(2)dba(3) which indicated the presence of much higher levels of palladium impurity in the final product. The polymerization of P(NDI2OD-T2) was demonstrated using the regular monomers (NDIOD-Br-2 and bithiophene) and also using a modified monomer with activated bithiophene (naphthalene diimide substituted bithiophene) under DHAP conditions employing SiliaCat Pd-DPP as the recyclable heterogeneous catalyst. The modified monomer proved to be amenable to DHAP polymerization using SiliaCat Pd-DPP as the heterogeneous catalyst, which could be consecutively reused four times with reproducible molecular weights in the range of M-n/M-w: 27.1/49.0 to 33.5/61.3.</p>
1 aKakde, Navnath, R.1 aAsha, S., K.  uhttps://library.ncl.res.in/content/exploring-siliacat-pd-dpp-recyclable-heterogeneous-catalyst-multi-batch-direct